Oh you don't work there?? my bad,,,i thought you, mazer and Lemmerhirt were duly employed by Sound United
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In any case, very true, forget the hifi and listen to Lord Yammy unplugged first. When you get a chance to listen to a couple of violins and my piano from Lord Yammy, you will become a believer. Welcome, welcome to the ways of the Yammy. You are finally on the correct path to enlightenment.
Okay enough teasing... Seriously, if you have the service manual for the A-S801, I hope you have the latest revision. On mine, I noted the following info that appears confusing because:
- on page 36, the block diagram clearly show the optical/coaxial inputs are routed to the PCM5101
- it reference page 57/58 (for more details I assume), but you look there, you will see that the optical/coaxial, and the USB DAC input all seems to be routed to the ES9010K2M via some multiplexor/switches/selectors.
- on the parts list, it does no even show the PCM5101, only the ES9010K2M.
Actually when eargiant (some of us would remember him) first post the schematic block diagrams of the A-S801, I told him the PCM5101 was used for the optical/coaxial inputs, only the USB DAC used the Sabre ES9010K2M chip, but after I downloaded the manual and took another detailed look, I then realized the seemingly conflicting info on different pages I noted above.
Now I am suspecting that perhap the block diagram on page 36 may apply only to the A-S701 that does not have a USB DAC module and it has just the one TI DAC. The 701's service manual is also not totally clear as on one page it shows the PCM5101, but PCM5102 on another, and finally on the parts list it only shows the PCM5102.
Either way it isn't a big deal, but since you brought this up, I thought I would share my findings. If you get your info right from Yamaha, that's great, but then I hope they would revise their service manuals. People who pay for the manual deserve to have accurate/clear information.
Oh, back to the WXA-50, again those service manuals don't necessarily show all the details but from as much as I could tell, there is a PCM5101 (unlike the S801's that was clear even on that) and it seems to be used for the aux output that could be used with an external premap/amp, according to the owner's manual.