Distortion with Ultra line out to B&K power amp

The Rotel spec indicates the output is 0.5 volts peak to peak which I believe was pretty standard fo CD players of it's vintage (2001). I did lower the line-in level to -10db but it did not make a difference.
That sounds very low for a CD player. Are you sure? Which Rotel model is it?
 
The Rotel spec indicates the output is 0.5 volts peak to peak which I believe was pretty standard fo CD players of it's vintage (2001).
0.5 V peak to peak is equivalent to 177 mVrms. That would be very, very low for every CD player ever made. Even the Philips CD100 had an output voltage of 2 Vrms for 0 dBFS.

But I think you could already rule out too high a voltage, so this might be of academic interest.
 
I've created a feedback ticket for Wiim and included the logs from my Ultra. I'll wait for their response before trying a reset or deleting and reinstalling the app.

I appreciate all the responses and will update the thread when new information is available.
 
Update!

I have no explanation for this but now without any further action on my part the Ultra is playing CD's just fine from the Rotel. I did a test yesterday with one of the most offending Telarc CD's and there was some minor distortion issues on big transients but no where near as before. I let it continue to play and after 15 minutes or so the distortion was completely gone. I've been testing again today and it seems to play fine.

This has me scratching my head and a bit uneasy with the setup. I have about a week left on my return/exchange window and don't want to be stuck with a device that might start acting up again down the road. For this reason I have it playing now for several hours and will continue to do so over the next several days. BTW Wiim just got back to me with a relatively cryptic reply to turn off EQ and if that doesn't work then perform a factory reset. I explained to them in my original message that the EQ was turned off.

I don't see how this could be a firmware issue but possibly a component related to the line-in connections. Firmware is what it is and I don't believe it can correct itself unless there is some learning function that figured out the problem and corrected it but that's maybe too AI for this situation.

I today received a Prozor coax to optical converter ($20 on Amazon) that I will try with the Rotel CD player. The Rotel only has RCA line out and an RCA coax, no optical. I'll try bypassing the DAC in the Rotel and use the Ultra's and see what I get.
 
BTW Wiim just got back to me with a relatively cryptic reply to turn off EQ and if that doesn't work then perform a factory reset. I explained to them in my original message that the EQ was turned off.
It's not all that cryptic if you take into account that EQ (just as well as pre-gain) could introduce digital clipping (after the Ultra's ADC), but from your description this doesn't seem to be the root cause.

The case remains somewhat spooky.
 
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