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geekhack Community => Other Geeky Stuff => Topic started by: rowdy on Sat, 14 November 2015, 20:28:36

Title: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sat, 14 November 2015, 20:28:36
I acquired some largish speakers very cheaply and would like to connect them to my PC via the headphone socket.

I know very little about audio equipment, perhaps someone can offer some suggestions :)

They are TEAC LS-83N speakers, depicted below with a QFR for size comparison.

[attachimg=1]

They have spring-loaded terminals on the back.

[attachimg=2]

What do I need to be able to connect these to the headphone socket on my computer?

Thanks :)
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sat, 14 November 2015, 20:35:18
50W means that they can handle 50 watts of power, but they probably need at least 5W-10W to drive them realistically to a reasonable level.

Something like this might be OK, but don't take my word, this is a 2-minute ebay search:

http://www.ebay.com/itm/2CH-Hi-Fi-Stereo-Amplifier-Booster-DVD-MP3-Speaker-for-Car-Motorcycle-Home-Mini-/111682262825?hash=item1a00c81729:g:xI8AAOSweW5VaBSM

and you may need something like this:

http://www.ebay.com/itm/Audio-Aux-5Ft-3-5mm-to-RCA-Male-to-Male-Stereo-Y-Cable-Adapter-for-MP3-iPod-etc-/181577265487?hash=item2a46d9314f:g:YCMAAOxyP4dTcid0

PS - they probably sound great - I "grew up" on solid state analog gear in the 1960s-70s-80s and it still sounds best to me!


Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: suicidal_orange on Sat, 14 November 2015, 20:45:12
What fohat said - you need an amplifier and a mini jack to RCA cable, as well as some wires from the amp to the speakers themselves.  The world of audio is much like keyboards so there's an amp for every budget and it's up to you how much you want to spend.

Also you don't want to connect it to the headphone socket unless you have to, a line out should get you a cleaner signal as it's designed to connect to an amplifier (many KOhm impedance) not some small speakers (generally around 30 Ohm) :)
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Coreda on Sat, 14 November 2015, 20:46:27
Yeah. You're going to need an amplifier to power those.

The red/black connections at the back use speaker wires (single/joined audio cables that split at the ends with bare wires). Those are then connected to the amp from which you can plug a standard 3.5mm jack audio to RCA adapter cable into from your headphone output.

(http://i.imgur.com/N3aYCTH.jpg)

I once had a setup which did this, using a Sony all-in-one system as the amp the speakers connected to it and the headphone jack output the signal to the stereo.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sat, 14 November 2015, 21:54:41
Thanks guys :)  My problem is that I don't know what to search for.

I was hoping to get some nice bass from these - I prefer lots of bass :)

fohat: Thank you for the information and links.  I found the same amp listed on eBay Australia (different seller, but still from HK), and it costs more than the speakers :))

Amp ordered!

I also have an embarrassing number of cables of different types, including one similar to the linked cable:

[attachimg=1]
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Coreda on Sat, 14 November 2015, 22:30:20
I also have an embarrassing number of cables of different types, including one similar to the linked cable:

(Attachment Link)

That's the one. Plug the 3.5mm side into your computer's audio out and the RCA ends into the amp.

All you then need is speaker cables which are easily found and enough space to fit the speakers :D
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sat, 14 November 2015, 23:28:39
I also have an embarrassing number of cables of different types, including one similar to the linked cable:

(Attachment Link)

That's the one. Plug the 3.5mm side into your computer's audio out and the RCA ends into the amp.

All you then need is speaker cables which are easily found and enough space to fit the speakers :D

The speakers actually came with a couple of likely-looking cables in a bag taped to the back of one.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: RabRhee on Sun, 15 November 2015, 00:17:38
Most of the cheap amps that appear on eBay are 12v, designed to be used in a car. To use them in a house you will need a 12v power supply, probably at least 2 amps of power (that red amp says 2-4A max). Unless the amp you bought specifically comes with mains power, you will need one.

You may have one lying around, if you do, you just need to make sure it is 12v, more than 2 Amp, and that the centre pin is the +, as that amp. (although that last bit can be easily swapped if it is - centre)

if you don' t have one, something like this is needed - http://www.ebay.com.au/itm/DC-12V-2A-Power-Supply-Adapter-Charger-Transformer-Plug-FOR-CCTV-LED-STRIP-LIGHT-/191722087504?var=&hash=item2ca386e450:m:mHHIxYlOOQR2bU_4ts8eJdA

(sorry to add to the costs, its still probably the cheapest option for an amp. I have the exact same setup on a family PC)
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Hak Foo on Sun, 15 November 2015, 00:22:04
Also consider a thrift store for a used reciever.  Older stereo-only and non-HDMI stuff-- but not old enough to be vintage collectable-- are virtually worthless.  Sometimes you can get pretty nice ones-- decent makes, lots of inputs-- for a Jackson or less.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 00:31:13
Most of the cheap amps that appear on eBay are 12v, designed to be used in a car. To use them in a house you will need a 12v power supply, probably at least 2 amps of power (that red amp says 2-4A max). Unless the amp you bought specifically comes with mains power, you will need one.

You may have one lying around, if you do, you just need to make sure it is 12v, more than 2 Amp, and that the centre pin is the +, as that amp. (although that last bit can be easily swapped if it is - centre)

if you don' t have one, something like this is needed - http://www.ebay.com.au/itm/DC-12V-2A-Power-Supply-Adapter-Charger-Transformer-Plug-FOR-CCTV-LED-STRIP-LIGHT-/191722087504?var=&hash=item2ca386e450:m:mHHIxYlOOQR2bU_4ts8eJdA

(sorry to add to the costs, its still probably the cheapest option for an amp. I have the exact same setup on a family PC)

I have two boxes full of old power bricks.  I suppose I should look to see if I have one with the required output.

Also consider a thrift store for a used reciever.  Older stereo-only and non-HDMI stuff-- but not old enough to be vintage collectable-- are virtually worthless.  Sometimes you can get pretty nice ones-- decent makes, lots of inputs-- for a Jackson or less.

I had to look that one up - a Jackson would be about AUD$28.  The speakers were about 1/3 that price!

Unfortunately most of the thrift shops around here seem to have clothes and old toys only.  I have sent my other half on a mission, while she does her walks around the local streets, to find such a shop that sells keyboards.  No luck.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 00:45:31
I can has power!

[attachimg=1]

Also this is the one I got: http://www.ebay.com.au/itm/291595190248
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: RabRhee on Sun, 15 November 2015, 00:54:31
I can has power!

(Attachment Link)

Also this is the one I got: http://www.ebay.com.au/itm/291595190248

Yes, that should do the job, 3 amp so should be comfortably enough. + centre. Now you just have to hope that the connector fits the amp :D

Hak Foo is right about the used receiver or amp, if you can get one its likely to be better quality and more power, I like the car ones because they are small and you can hide them behind a PC case. But if size isn't an issue, long term a proper hi-fi amp will be better. These cheap car amps work fine enough though.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Photekq on Sun, 15 November 2015, 00:58:02
Look into buying a second hand stereo amp from the 80s/90s, like a NAD or something. You can probably get a good one around $50-100. It'll make them sound a hell of a lot nicer than that cheap amp.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 01:39:04
Look into buying a second hand stereo amp from the 80s/90s, like a NAD or something. You can probably get a good one around $50-100. It'll make them sound a hell of a lot nicer than that cheap amp.

I don't even know if the speakers work yet!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: GuilleAcoustic on Sun, 15 November 2015, 02:49:03
Bass need a beefy power.supply stage on the amplifier with especially high capacity caps to store as much power as possible.

If you like Diy, the gainclone is a great and easy design that deliver around 60W, depending on the load impedance.

Feel free to ask any question, I'll try to answer them as clearly as possible.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 03:26:12
Bass need a beefy power.supply stage on the amplifier with especially high capacity caps to store as much power as possible.

If you like Diy, the gainclone is a great and easy design that deliver around 60W, depending on the load impedance.

Feel free to ask any question, I'll try to answer them as clearly as possible.

An interesting idea.  Been a while since I've built a kit anything.

The amp from HK is on its way (or soon will be), so I'll try that first, and at least find out if the speakers work.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 09:14:50
In my experience, working stereo receivers are very difficult to find in 2nd-hand stores, because they are snatched off the shelf the instant that they touch down.

When I do manage to find one on the cheap, I often nab it, because I love that old 1970s-1980s warm distorted sound, since that was what I heard during my peak music-listening years.

If you like the speakers, use the $10 one I linked and stay on the lookout for a good used receiver to drive the bass. With the pressure off, you can always find a good deal if you are patient enough.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: tronbeaver on Sun, 15 November 2015, 09:49:11
Look into buying a second hand stereo amp from the 80s/90s, like a NAD or something. You can probably get a good one around $50-100. It'll make them sound a hell of a lot nicer than that cheap amp.

I don't even know if the speakers work yet!

You might be able to have enough power to drive from a sound card to at least see if functional.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 13:16:41
In my experience, working stereo receivers are very difficult to find in 2nd-hand stores, because they are snatched off the shelf the instant that they touch down.

When I do manage to find one on the cheap, I often nab it, because I love that old 1970s-1980s warm distorted sound, since that was what I heard during my peak music-listening years.

If you like the speakers, use the $10 one I linked and stay on the lookout for a good used receiver to drive the bass. With the pressure off, you can always find a good deal if you are patient enough.

That's exactly my thought!  And to see whether the speakers actually work.

You might be able to have enough power to drive from a sound card to at least see if functional.

But despite my cable collection, nothing with a .5mm plug on one end and two pairs of bare wires on the other (at least not without sacrificing an existing cable).
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: 1swt2gs on Sun, 15 November 2015, 13:18:06
rowdy!

This is overkill for some computer speakers!  :D
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: TacticalCoder on Sun, 15 November 2015, 17:43:27
What do I need to be able to connect these to the headphone socket on my computer?

Sweet!  That's the kind of setup I have in my living room to listen to music: a computer hooked to a good old Harman Kardon amplifier and stereo speakers.  That amp is more than 20 years old (and I'm using it since more twenty years: which is crazy, my amp is older than many GHer) or so and still doing its job just fine.  My speakers are KEF ones at the moment but I plan to change them soon.

So it's old-school style but for the "source": a computer playing mp3 and some flac/lossless music. TV is connected to the amplifier too.  I used to have a cassette player, a CD-player and then even a Mini-Disc player (the Sony MiniDisc thinggy, which never really took off) hooked to that amp :)

Now it's computer + DAC but the amp is still the same :)

My good old amp is not totally unlike this one:

[attachimg=1]
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Badwrench on Sun, 15 November 2015, 18:13:10
I think you are going to be pretty good with that amp and those speakers.  The wattage of theamp gets you into what those speakers are rated, so the sound shold be quite good.  If you have a decent onboard eq, make sure to bypass on the amp.  If not, you can dial the highs and bass to a point with the amp.  That one is very similar to the lepai which I have had great luck with. 
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 15 November 2015, 18:57:02
Well, the amplifier will work.  It should even though it is rated at 4w RMS per channel.  That's enough to drive the speakers. 
I won't go too far into detail, but you might need a better amplifier in the future.
Let us all know how it works out!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 19:13:30
Well, the amplifier will work.  It should even though it is rated at 4w RMS per channel.

Whoa!

The one I linked had much better specs than this, mine had 20W RMS per channel.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 15 November 2015, 19:20:33
Well, the amplifier will work.  It should even though it is rated at 4w RMS per channel.

Whoa!

The one I linked had much better specs than this, mine had 20W RMS per channel.

It is the same amplifier Fohat.  The MA-170.  The devil is in the details.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 19:29:00
The devil is in the details.

So I suppose that the ebay seller totally lied and listed the peak power as the RMS power in his description?

Probably to be expected.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 15 November 2015, 19:31:51
The devil is in the details.

So I suppose that the ebay seller totally lied and listed the peak power as the RMS power in his description?

Probably to be expected.

Yes.  That doesn't mean it's bad, it will work.  For the price, it's a good deal.  However, I believe Rowdy can find a second-hand amplifier or receiver rated at around 25-50w RMS that would be significantly better for a reasonable price.  For now, let's just see if it works.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 19:51:47
rowdy!

This is overkill for some computer speakers!  :D

It's the way to go :D

Well, the amplifier will work.  It should even though it is rated at 4w RMS per channel.  That's enough to drive the speakers. 
I won't go too far into detail, but you might need a better amplifier in the future.
Let us all know how it works out!

Oh.

The seller I got it from appears to have misrepresented it too.

I did look at the other search results, and for anything bigger the cost increased significantly.

At this stage I just want to find out whether the speakers work.  And I suspect the opportunities to crank for volume up will be few and far between.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 20:06:28
I think that this will turn out to be a decent little amp for basic use if you don't need to drive it too loud.

http://www.parts-express.com/kinter-ma-170-2-channel-mini-amplifier-bass-treble-rca-in-2x18w--310-372 (http://www.parts-express.com/kinter-ma-170-2-channel-mini-amplifier-bass-treble-rca-in-2x18w--310-372)

Here is a nerd testing it pretty well and at about 15:00 proclaims that it produces about 5.7 strong clean watts:

https://www.youtube.com/watch?v=XPPrk-SULIs (https://www.youtube.com/watch?v=XPPrk-SULIs)
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 15 November 2015, 20:12:51

Oh.

The seller I got it from appears to have misrepresented it too.

I did look at the other search results, and for anything bigger the cost increased significantly.

At this stage I just want to find out whether the speakers work.  And I suspect the opportunities to crank for volume up will be few and far between.

Well, it's not necessarily "cranking it up" that is the problem.  It's the amount of headroom the amplifier has.  At higher volume the sound quality will substantially decrease.  And having around a 70db signal to noise ratio, it's not exactly "high end".

On the plus side, it will work good for what it is.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 20:20:09

And having around a 70db signal to noise ratio, it's not exactly "high end".


For ten frakking dollars, you can't ask for audiophile gear!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 15 November 2015, 20:36:54

And having around a 70db signal to noise ratio, it's not exactly "high end".


For ten frakking dollars, you can't ask for audiophile gear!

LOL!  It's good for what it is!  I'm not arguing that at all!  It will be enough to test the speakers.  If Rowdy decides, he can get a better amplifier in the future.  That's all I said.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 15 November 2015, 20:45:33

And having around a 70db signal to noise ratio, it's not exactly "high end".


For ten frakking dollars, you can't ask for audiophile gear!

What the speakers cost :))

If they work, I can look at getting a better amp.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 15 November 2015, 21:39:18
Somewhat off-topic, but for people reading this and thinking (<$100) about hooking up turntables and vinyl to their sound cards:

http://www.phonopreamps.com/ (http://www.phonopreamps.com/)

these products are hard to beat at their price points.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Mon, 16 November 2015, 00:29:30
Somewhat off-topic, but for people reading this and thinking (<$100) about hooking up turntables and vinyl to their sound cards:

http://www.phonopreamps.com/ (http://www.phonopreamps.com/)

these products are hard to beat at their price points.

Actually, there is some pretty cool stuff there Fohat!  Nice find!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Mon, 16 November 2015, 03:35:40
That's a whole other money sick there!  Lucky I just want to see if these speakers work!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Mon, 16 November 2015, 07:28:32
there is some pretty cool stuff there

I have had a TC-750LC for several years and it works great. I upgraded the power supply from the fractional amp power brick that they gave me to a 2A Linksys left over from a dead modem and it helped a lot. But I had to buy a 3.5mm-to-1.3mm adapter because the TCC uses a small funny plug.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Fri, 27 November 2015, 07:55:51
Hey, Rowdy, just checking up on this.

Did it all work out?
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 06 December 2015, 00:16:33
Finally the amp arrived.

[attachimg=1]

Everything connected fine, plugged together well, and powered up as expected.

The amp has a light around the main dial on the front, which is the volume, and this light gradually changes colour.

The speakers both work!

Although due to lack of space they are a metre and a half behind me.  Listening to some familiar music it seems that I have cotton wool in my ears as the sound seems muffled.

The volume goes up reasonably well, but not as high as I'd expect, probably due to the amp.

So at least they work, which was the biggest question.  Now to decide whether I want to spend more money to get them to work better, if they even can.

I'm wondering whether the muffledness is because the speakers are behind me on the floor, rather than sitting on the desk in front of me.  Or because they are 1.5m behind me instead of 30cm in front of me.  Or because they have huge woofers whereas the little Logitech speakers don't.  Or because they are aged and inform, whereas the Logitech speakers are only a couple of years old (and the power button is already broken).

Any thoughts

Thanks for all the help so far :)
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 06 December 2015, 09:30:11
Finally the amp arrived.

(Attachment Link)

Everything connected fine, plugged together well, and powered up as expected.

The amp has a light around the main dial on the front, which is the volume, and this light gradually changes colour.

The speakers both work!

Although due to lack of space they are a metre and a half behind me.  Listening to some familiar music it seems that I have cotton wool in my ears as the sound seems muffled.

The volume goes up reasonably well, but not as high as I'd expect, probably due to the amp.

So at least they work, which was the biggest question.  Now to decide whether I want to spend more money to get them to work better, if they even can.

I'm wondering whether the muffledness is because the speakers are behind me on the floor, rather than sitting on the desk in front of me.  Or because they are 1.5m behind me instead of 30cm in front of me.  Or because they have huge woofers whereas the little Logitech speakers don't.  Or because they are aged and inform, whereas the Logitech speakers are only a couple of years old (and the power button is already broken).

Any thoughts

Thanks for all the help so far :)

I will give you my thoughts.

First, check the connections inside the speaker itself.  Be sure all the speakers are properly connected and listen to each speaker in the cabinets and check if they are making sound at all.

I am guessing your midrange/tweeters are not functioning properly and if you play some music, double-check to see if there is any sound coming from them at all.  If there is little or no sound, they may need to be repaired because the surrounds are deteriorating.  That's normal.

It may even be happening with your woofers too.  Check and see if the edges of the speakers are solid.  They may be very worn out, and may need to be reconed or replaced.
Since they are not pushing/pulling properly, you will not get good sound at all.

The good news is you don't need to spend an arm and a leg to restore them.
A poor man's solution is using silicone on the surrounds.  You need a paintbrush and silicone.  It's not a great fix, but it may be something you can try.  You apply a thin layer and let it dry.

Hopefully, you will have speakers that work once again, but depending on the damage, they may not work at all.  The voice coils may be burned out.  If this is the case, you will need to replace the speaker components themselves.

If you find that to be too costly, you might want to look into a new pair of speakers.

(http://i.imgur.com/G5mi0Wq.jpg)

(http://i.imgur.com/zjhJxT3.jpg)

Edit: Here is a good example of a midrange and tweeter that could be repaired using the silicone method.  I really should just replace them on both speakers.  We will see how they turn out.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 06 December 2015, 10:24:21

Listening to some familiar music it seems that I have cotton wool in my ears as the sound seems muffled.


That is troubling. Regardless of the details of placement or room acoustics, the speakers need to be producing the proper sounds.

Like snowdog said, first verify that the speakers are not physically damaged and put your ear up to them, one at a time, and try to determine whether all are functioning properly, if at all.

Best is to test each type appropriately, for example try a flute solo in the tweeters or a bass solo on the woofers.

Of course, the first thing to check is wiring and plugs, then look at playback settings to make sure that everything is balanced neutral and that bass or treble (or other equalization, if available) are not turned out to extremes.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Spopepro on Sun, 06 December 2015, 10:39:16
Correct advice so far. Check those things.

More stuff to check:
Easy first: are the cabinets a ported bass design? Is the port rear-firing and you have it up against the wall? Some speakers need space behind them because of ports.

Harder: crossovers often require big capacitors, and big capacitors can be expensive. But not if you use electrolytic caps... which have a very finite lifespan. If these are old, you might have a poorly functioning crossover. To find out, you would have to disassemble the speaker, so I'd call this the last thing to try.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 06 December 2015, 10:58:32
Correct advice so far. Check those things.

More stuff to check:
Easy first: are the cabinets a ported bass design? Is the port rear-firing and you have it up against the wall? Some speakers need space behind them because of ports.

Harder: crossovers often require big capacitors, and big capacitors can be expensive. But not if you use electrolytic caps... which have a very finite lifespan. If these are old, you might have a poorly functioning crossover. To find out, you would have to disassemble the speaker, so I'd call this the last thing to try.

Yeah crossovers can be the life or death of a speaker system.  It is a last resort.  Those speakers are not the highest quality, and if you decide to do the crossover thing, you might want to consider replacing all the components if you go that route. 

However, if you do, you might wind up with a kick ass speaker system! 
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 06 December 2015, 11:34:21

However, if you do, you might wind up with a kick ass speaker system! 


Yeah, with China / internet / ebay / etc components such as speakers have become easily available and cheap nowadays.

I built a subwoofer in the late 1980s and the driver alone was over $100, and it was not even a "top name brand"

note to self: I still have it, I really need to build a new cabinet for it (huge 15" with massive magnet and dual voice coils .... )
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 06 December 2015, 11:39:44

However, if you do, you might wind up with a kick ass speaker system! 


Yeah, with China / internet / ebay / etc components such as speakers have become easily available and cheap nowadays.

I built a subwoofer in the late 1980s and the driver alone was over $100, and it was not even a "top name brand"

note to self: I still have it, I really need to build a new cabinet for it (huge 15" with massive magnet and dual voice coils .... )

Hehehe!  I know the feeling.  I went overboard on my A/V system.  It wound up costing me more than I wanted, but it turned out nice!
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 06 December 2015, 20:48:57
Thanks guys - a list of things to try.  Both woofers are working, the tweeters I'm not so sure about, although there was a little sound.  Trying different music/sound samples is an excellent idea.

Easy first: are the cabinets a ported bass design? Is the port rear-firing and you have it up against the wall? Some speakers need space behind them because of ports.

Excuse my ignorance - ported bass design means it has a hole in the back of the speaker?

These have no holes - the back is just a sheet of wood with the spring connectors for the wires in the middle.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Sun, 06 December 2015, 21:01:01
ported bass design means it has a hole in the back of the speaker?

There *may* be a hole somewhere - sound waves bounce around inside and this gives them a way out. It means that the cabinet can be smaller and provides more efficiency. That is an entire realm of esoterica that you may not need.

Look for a hole of some decent size but probably not big enough to get your hand in, and ensure that it is not blocked. Low frequencies are not directional like high frequencies are.

 
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Mon, 07 December 2015, 03:25:34
No holes on the back, top or sides.  Unless there's one underneath, which is unlikely as they sit flush on the floor, I'd say they are probably not ported.

Weekend job, I don't have enough time to do things like this during the week.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Mon, 07 December 2015, 09:53:42
No holes on the back, top or sides.  Unless there's one underneath, which is unlikely as they sit flush on the floor, I'd say they are probably not ported.

Weekend job, I don't have enough time to do things like this during the week.

No big deal at all.  I have the feeling if there is a tuned port at all, it would be in the front.  You will still have to remove the speakers to check the wiring as well.

Essentially, there are a few types of loudspeakers, acoustic (air) suspension and bass reflex.  Air suspension has no holes at all in the cabinet, and are less efficient than bass reflex, because the port allows the speaker to "breathe" and give more bass response.

You are right about it being a weekend project.  If you have to use silicone to repair the speakers, that alone takes 24 hours to allow the silicone to harden before you can test them again.  Hopefully that will be all that is needed to be done.

The fabric cover on the front of the speakers should be easy to remove and replace.  There are usually pegs in the corners to hold it in place.  Makes it easy to clean as well.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Wed, 30 December 2015, 17:50:05
I opened one of the speakers.

It has some fluffy stuff glues to the inside of the back panel.  The green wire has a capacitor, the other wires do not.

[attachimg=1]

All wires are plugged in.

[attachimg=2]

The woofers don't look as big from the back :))

[attachimg=3]

They are ported - the hole is in the front.

[attachimg=4]

They look fairly simple inside.  Probably something simple has gone wrong, like the coils or cones need replacing.

[attachimg=5]
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Wed, 30 December 2015, 18:51:23
They look fairly simple inside. 

Silly simple inside. If everything is connected, and still dead, try bringing a pair of hot wires directly to the back of each speaker from the amplifier. Very low volume please to avoid damage especially to the tweeters.

If a valid signal does not produce even a whimper of sound, then the speaker has a problem. If you can get a response from the speakers, then the problem is obviously the plugs/connections or the crossover is completely defunct.

You have verified that the amplifier is powered up, operating, and producing a real signal, right?

Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Wed, 30 December 2015, 20:22:54
They look fairly simple inside. 

Silly simple inside. If everything is connected, and still dead, try bringing a pair of hot wires directly to the back of each speaker from the amplifier. Very low volume please to avoid damage especially to the tweeters.

If a valid signal does not produce even a whimper of sound, then the speaker has a problem. If you can get a response from the speakers, then the problem is obviously the plugs/connections or the crossover is completely defunct.

You have verified that the amplifier is powered up, operating, and producing a real signal, right?

Both speaker units do work (yet to confirm whether each actual speaker on each side works, but at least both woofers do), but they sound very muffled compared to my old small desktop speakers (which now won't power on at all, but that's a broken power switch and a different story).

I had hoped for a louder, clearer sounds from these large speakers, preferably with lots of bass.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Wed, 30 December 2015, 22:04:53
Both speaker units do work (yet to confirm whether each actual speaker on each side works, but at least both woofers do), but they sound very muffled compared to my old small desktop speakers (which now won't power on at all, but that's a broken power switch and a different story).
I had hoped for a louder, clearer sounds from these large speakers, preferably with lots of bass.

Eh, I think you can do better with new ones.  I just hope I can find you something that will work better for you, especially for a low price.  Replacing all the drivers and a new 3-way crossover with real high-quality gear might be a bit more than you want to spend.

So, looking for something a bit more compact and a bit less pricey than what I was thinking.

I'm hopeful and guessing that the opening at the bottom is for an 8" driver.

And man, it's hard finding audio stuff in Australia.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Badwrench on Wed, 30 December 2015, 22:22:26
I have a set of Sony SS1000 that I would be willing to send out if anyone wants to help out with shipping.  I know they sound good with that little amp since that is what I was using. 
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Wed, 30 December 2015, 22:46:53
Both speaker units do work (yet to confirm whether each actual speaker on each side works, but at least both woofers do), but they sound very muffled compared to my old small desktop speakers (which now won't power on at all, but that's a broken power switch and a different story).
I had hoped for a louder, clearer sounds from these large speakers, preferably with lots of bass.

Eh, I think you can do better with new ones.  I just hope I can find you something that will work better for you, especially for a low price.  Replacing all the drivers and a new 3-way crossover with real high-quality gear might be a bit more than you want to spend.

So, looking for something a bit more compact and a bit less pricey than what I was thinking.

I'm hopeful and guessing that the opening at the bottom is for an 8" driver.

And man, it's hard finding audio stuff in Australia.

They are the right size, around 20cm, but each one of those costs about 5 times what the pair of speakers cost.

At this stage I'll just ... dunno.  Too hot to bother about it now.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fohat.digs on Fri, 01 January 2016, 09:31:11
At this stage I'll just ... dunno.  Too hot to bother about it now.

Modern speakers are getting pretty good, and the primary thing wrong with "computer" speakers the size of a shoe or smaller is lack of bass.

One possibility would be to junk everything except one cabinet and replace the single woofer driver. Low frequencies are not directional so one woofer will take care of the entire room and you can shove it in a corner.

As long as you could figure out the proper crossover/volume control/power scenario you could use that together with your "little" speakers.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Fri, 01 January 2016, 10:18:33
Sometimes you can actually find an active subwoofer at a thrift shop.  Sometimes you get lucky, even if the driver is shot, that can be replaced.  The biggest thing is you have the amplifier and premade enclosure.
The best score is finding one completely intact!  You actually can.  It just takes a little patience and hunting around.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Fri, 01 January 2016, 11:42:13
So I recently powered on my parents old Panasonic 8-track receiver with Panasonic Thrusters speakers.  These had a passive radiator in them so the lower frequencies sounded great, but it was missing the highs.  I somehow recalled that it had sounded a lot better when I was younger.

Then I realized what was different--we would also use the Panasonic dual tape deck we had with tiny 4" speakers at the same time when listening.  The combination sounded wonderful with full frequency response top to bottom.

So why am I sharing the story?  Use your desktops for the highs and use these big guys for the lows.  If they're all on the same wall (or source of sound), you'll hear the sound as one unit.  You may have to fine tune volumes on both before the sound seems seamless, but it's definitely worth a try.

Oh, and to split the audio from the computer, just use a headphone splitter and then connect both systems to the splitter.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sat, 02 January 2016, 02:07:35
I have a set of Sony SS1000 that I would be willing to send out if anyone wants to help out with shipping.  I know they sound good with that little amp since that is what I was using. 

This is generous, but shipping from the US to Australia would be silly expensive.  Given the size of speakers, I'd guess around $80 to $100 shipping :eek:

And to everyone else: the desktop speakers have died.  The power switch (push on/off) won't stay on unless you hold the switch in.  it's been getting worse for a while, and now won't turn on at all.  I could desolder and replace it if I could find a suitable replacement switch.

Also one of the HiFi speakers is now dead, although I don't know if my daughter did something to the cable when she tripped over it, or my opening it has disturbed something.  I opened it again and everything is still plugged in, but that speaker is now completely dead (although the other one still works, albeit being a bit muffled as both were at the start).
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Sat, 02 January 2016, 07:12:11
:(  Sounds like everything will have to move on to repair/recyclers/trash soon.

But if it's any compensation, this Sony model sa-d10 (http://www.sony.co.in/product/sa-d10) which is available in the Asia Pacific Rim area according to their site, is an absolute steal for the sound quality.  We bought one for my wife's parents and this little kit rocks a 30x30 room no problem.  It's just regular right and left stereo sound even though it has 4 speakers, but because of the ability to place those speakers where you need them, the sound is really full and clean. 

The wireless remote and multiple input options including direct usb playback are great bonuses.  I actually hooked it up to their tv and now everything goes through those speakers.  Highly recommended if you can pick it up locally as a replacement.  They actually sound every bit as good as the Cambridge Soundworks Microworks system I bought many years ago for 3x the price.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 03 January 2016, 00:30:46
FWIW I have a 5.1 surround sound speaker set, but it's central speaker has a way too thick wire that usually ends up causing that speaker to point at the ceiling, the satellites have many metres of cable that inevitably gets everywhere, and my PC (Mac mini) only has stereo ouput, so this is major overkill.

I used to use it on an old gaming PC with 5.1 sound output, but that machine has long since been retired, and the speakers unused since then.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: fanpeople on Sun, 03 January 2016, 02:43:10
FWIW I have a 5.1 surround sound speaker set, but it's central speaker has a way too thick wire that usually ends up causing that speaker to point at the ceiling, the satellites have many metres of cable that inevitably gets everywhere, and my PC (Mac mini) only has stereo ouput, so this is major overkill.

I used to use it on an old gaming PC with 5.1 sound output, but that machine has long since been retired, and the speakers unused since then.

Is that from when you used to play The Incredible Machine competitively
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 03 January 2016, 03:00:59
FWIW I have a 5.1 surround sound speaker set, but it's central speaker has a way too thick wire that usually ends up causing that speaker to point at the ceiling, the satellites have many metres of cable that inevitably gets everywhere, and my PC (Mac mini) only has stereo ouput, so this is major overkill.

I used to use it on an old gaming PC with 5.1 sound output, but that machine has long since been retired, and the speakers unused since then.

Is that from when you used to play The Incredible Machine competitively

Ahaha no.  That PC I built for Doom 3, although the speakers were a later addition.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Sun, 03 January 2016, 10:19:26
Move the sound card! :D

Bummer that the 5.1 set doesn't sit right.  Sell it for cash towards a new 2.1 system?
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Sun, 03 January 2016, 10:28:38
https://www.audioaustralia.com.au/accusound-speakers-8-6xd-6-200w-2way-bookshelf-or-wall-5yr-warranty.html

That's about the best quality speaker I could find for your money out there Rowdy.  I think you will be very happy with them.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Sun, 03 January 2016, 23:01:01
Move the sound card! :D

Bummer that the 5.1 set doesn't sit right.  Sell it for cash towards a new 2.1 system?

I was thinking about this, but I suspect the sound card if PCI and I don't know if the replacement PC has any PCI slots (free).

https://www.audioaustralia.com.au/accusound-speakers-8-6xd-6-200w-2way-bookshelf-or-wall-5yr-warranty.html

That's about the best quality speaker I could find for your money out there Rowdy.  I think you will be very happy with them.

Bookmarked thanks - I have other areas that desperately need funding at the moment, unfortunately.  Hence the desire to get the big old speakers working at minimum cost.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Mon, 04 January 2016, 00:11:58
I was thinking about this, but I suspect the sound card if PCI and I don't know if the replacement PC has any PCI slots (free).
That was what I was thinking would be the biggest challenge. :( Imagine if the card was an older ISA--then there would have been no chance at all!  :eek:  Luckily, drivers shouldn't be an issue at all.

If there isn't a free PCI slot, you could always get a usb or pci-e sound card--they seem to be cheaper than a good set of speakers.  :thumb:



Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: rowdy on Mon, 04 January 2016, 01:31:02
I was thinking about this, but I suspect the sound card if PCI and I don't know if the replacement PC has any PCI slots (free).
That was what I was thinking would be the biggest challenge. :( Imagine if the card was an older ISA--then there would have been no chance at all!  :eek:  Luckily, drivers shouldn't be an issue at all.

If there isn't a free PCI slot, you could always get a usb or pci-e sound card--they seem to be cheaper than a good set of speakers.  :thumb:

I suspect there may not have been any 5.1 sound cards back in the ISA era.

A stereo SoundBlaster would have been as good as it got.  Gotten.  Was.  Had been.  As good as you could get.  Something.
Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Mon, 04 January 2016, 08:25:54
I was thinking about this, but I suspect the sound card if PCI and I don't know if the replacement PC has any PCI slots (free).
That was what I was thinking would be the biggest challenge. :( Imagine if the card was an older ISA--then there would have been no chance at all!  :eek:  Luckily, drivers shouldn't be an issue at all.

If there isn't a free PCI slot, you could always get a usb or pci-e sound card--they seem to be cheaper than a good set of speakers.  :thumb:

I suspect there may not have been any 5.1 sound cards back in the ISA era.

A stereo SoundBlaster would have been as good as it got.  Gotten.  Was.  Had been.  As good as you could get.  Something.
I thought I recalled a few being available back in that era.  Sound cards really didn't have that much data to move until 5.1 and 7.1 became a thing.  I always found it amusing to find 2 channel sound cards in pci versions when isa cards were definitely fine.

Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: Snowdog993 on Mon, 04 January 2016, 09:53:40
About the best sound card that was available in ISA was the Sound Blaster Awe64 Gold.  I had TWO of them!  I can't imagine they had anything better than that in ISA.  But then again, that was a while ago.

Title: Re: Connecting some (probably ex-hifi) speakers to a PC
Post by: SamirD on Mon, 04 January 2016, 12:03:26
I still have the Awe32 with a Yamaha wavetable board on it--midi never sounded so good. :D  It was fun to just load up Descent just to hear the intro music.