This kind of an oddball review (dampening material), but it might help some.
I had a Hasu replacement controller arrive in the mail for a new board, and while I had the case open, I thought I’d see if some EDPM rubber would have enough head room inside the case for some sound dampening. It closed fine, so I cut it to fit (roughly) with some heavy scissors and tacked it down with a hot glue gun.
It reduces the sound nicely. I really like what it has done. It also probably increased the overall weight of the board by 30% due to the density of the EDPM. Previously, I had Hypersphere rings installed, and I found I preferred a little crisper, brighter sound. The rings did what they’re supposed to do, and I’d recommend them if you want an experience closer to silent.
You might see in the photo I also dabbed a bit of hot glue on the lower left corner to add some strength to the replacement controller—not needed but a guy with a hammer sees everything as a nail…
https://i.imgur.com/aV6GYTE.png The effect is what I would imagine PFU’s HHKB Vibration Absorption Mat (
https://goo.gl/9aJDnt) is like, only you don’t have to see it as it’s on the inside, and it doesn’t change the height of your keeb. Should have made a before and after audio sample, but I forgot. Sorry.
I sourced the EDPM (industrial roofing rubber sheet—sources) from geekhack user fohat.digs for about $10, maybe even less. It’s about 1 mm thick. Cuts fine with razor or good pair of scissors. HomeDepot sells some (
https://goo.gl/2jf82F), but I don’t know if it’s the same stuff (ping fohat.digs on GH).