The sound might change, to be sure, but a blacker background and lower noise floor? That seems more than just a little unlikely since you have to have a pretty spectacularly shitty amp to have a noise floor with the 650s to begin with.
It is highly unlikely that you'll find what you're after. Balanced DAC's, by default, tend to have a hot output. There's absolutely nothing wrong with the voltage divider approach.
I can't see how lacquer would affect a plinth. In an instrument you're counting on the wood to be a part of the equation, in a plinth you're using the mass to not vibrate. Two very different applications one in which I see the finish as an active player (instrument) and one in which I can't see a way it which it'd make a difference. That's my 2c.
Indeed, when I bought it (about 2 years ago) it had just been serviced and calibrated. I've also got both the original and a very extensive aftermarket manual for it.
I've got my eye on a couple of things and if they pan out I'll let head-case know first.
Yup, I have some copper solder that looks the same way when the joint cools. I'm tempted to blame the switch but the fact is that there may be nothing really wrong. A call or email to Goldpoint might be worthwhile.
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