Spending time worrying about DACs is a fools errand. Focus on speakers, source material and room.
Except the original signal was heard and presented by the mastering engineer with entirely different gear than any end user. Unless you can replicate the the entire chain of what the master used for playback, you will never know what the master intended you to hear. Add the difference in ears and brain to the equation to make it even more nonsensical.
should be the same reallyBetween Toslink and SPDIF which input is better to use with a D30? I know USB is the king, but out of these two, which one?
Anyone else find it a little compressed in I think was the upper-mids. I sound the D10 to be better in this regard and still have my D10.
Sighted listening?
Yes but it's so apparent that the D30 sounds like poopy or there is bad batch floating about. The sound signature might also be liked by some, who knows? I only had it for a few weeks and hated it, the D10 had a blacker background and better separation.
a bit tweak around the two LDOs will make it sounds a lot faster with a lot of attack.
You are welcome to refer to TI's datasheet on LM317 and LM337 on transient response of the LDO.
My main gripe is topping put 4 capxon caps in this unit. I used to have capxon failed in an use hub, and don't want them.
I have been experimenting this on another perf board for a while and can safely say this will only increase noise floor if you examine with a scope.
For line level, slew rate is not a huge problem and 5V/us is sufficient. Plus, in D30, those LDOs only feed into the opa2132.
Refer to it for your personal interest. I am in no mood explaining what I wrote on this topic. https://drive.google.com/open?id=1nI_EkXubOQon-b5293qMuAQ9Y5SQj8fG
I have some extra measurements here: https://drive.google.com/open?id=1hlu2_QqfUGVbg4eBIIC5alpeBZWrt6ep Picture ended with "t" is for transient.
No, you still didn’t get it. LDOs like LM317’s noise is not determined by output capacitor. It’s set by Cadj that’s decoupling the Adj pin. Output cap only improves transient response. So if you still think of snr you are dead wrong. You don’t need output capacitor on LM317 at all and noise won’t change.
Ultimately my mod would make those ldos response faster to voltage drops under load.
well get your hands on a real circuit other than your keyboard then. It’s fun.