The cchd-575 on the Amanero board of the r2r 11 really takes it to the next level, can't believe how good it is.

Seems easier to have NOS sound right. I really enjoy dedicated NOS DAC more than the NOS mode of a dac that does both. I slightly prefer OS in this case. NOS in its purest form will exhibit quantization errors. Which are random, so spreads in the whole freq range. So you need to apply a filter...

Interesting stuff. I think that when you get rid of the high-freq noise disturbing the dac's performance, especially in Os8 mode, the glare is also almost inexistant. I think there is nothing especially wrong with overampling, it's just that playing at a high-frequency requires better isolation...

Yeah, it probably is.

Yes indeed. I just did the maths again. No processing is a 3db attenuation at 20khz. Was a bit tough, i had to remember the basics. Getting old. :) Same story with the r1-nos. You can't get a flat response within 0.5dB without processing. Nor a 110S/N ratio playing 16-bit files.

You dac needs only a few hours IMO to reach a stable sound. It's not what it used to be. The boards have been updated since the 1st gen. The DA8 board(what you have) never needed much warming up anyway . The old da7 needed quite some time. About 24h.

No hot connection of the usb blaster of course. And setting up for updates can be a real pain.

Kingwa told me to try this once. There is no danger to doing this if you have an update port.

They don't do anything. I don't agree with @sajunky. I think NOS does processing. And OS0 none. But ask Kingwa. :) In both cases the sampling rate remains the incoming one of course.

First try the fw update.

Yes. But no processing applied can sound more transparent. I prefer NOS, it is better balanced. In 2021, I think there was no distinction between the nos settings.

Os0 is no processing at all so it should miss some highs. Nos has equalization done in the digital domain. The nos submodes are no longer existant so if you have a recent fw, this setting makes no difference.

Of course, the damage must not have been caused by the user. Maybe the previous owner did some mods. Anyway, let us know if the fw update works.

Audio-gd should cover the repair except shipping i believe. If damage is not caused by the user. The Music Room has also maybe sort of coverage.

I have no idea, frankly.