OMG, this thing measures Fantastic. Tweeter hiss went from 38db to 33db, which is more/less the noisefloor of the ghettobutt umik mic.
It's SOooooooo good. 116sinad, believe it, and running on dirtybutt COMPUTER POWER, Tp4's not even using a separate power brick.
Yup, just verified, using output from the Soundcard via toslink, noise went up to 39db.
USB seems to have latency, but it's a good thing Tp4 doesn't game no more.
Although it's equally likely they just have mute circuits on these, which you don't have with toslink.