Hi. I started a discussion on the thread 'ANNOUNCE: piCorePlayer 5.0.0'
(https://forums.slimdevices.com/showthread.php?110642-ANNOUNCE-piCorePlayer-5-0-0/page52)
(starts on page #518) and it was suggested to start a new thread (thanks
to @Man in a Van and @paul- for their help so far). To summarize
As I understand it, the ESS9038Q2M DAC chip (as found on the Khadas
board) can control the volume of its outputs (instructed by i2c). I
understand that this is potentially an optimal method of controlling
volume is because it does it by using some serious hardware
oversampling (or something like that) which is preferable to altering
the stream in software before it is sent to the DAC (where it is usually
advised to leave volume setting in players at 100% for bit-perfect
transmission). Of course, chip-level volume control also offers us the
opportunity us to remove pots / stepped attenuators from the signal path
(if we dare to place trust in our settings!)
Now, I am certainly able to control volume coming out of the Khadas
board (which attached to a Pi 3B via USB) using the slider on the LMS
interface but I would like to understand what PCP is doing. Is PCP:
A - doing software adjustment of the stream sent to the DAC (i.e. not
bit perfect)
or
B - sending the original bit perfect stream and instructing the DAC (via
the driver) to alter its outputs (i.e. the supposedly preferable
method).
If it is not doing B, can it be done? I would be very grateful for any
advice.
Some relevant info
- From my reading of 'this thread on the Khadas forum'
(https://forum.khadas.com/t/hardware-volume/2696), DAC controlled
volume has been achieved using Volumio (but much of it is over my head
so Im not sure!)
- 'This widget'
(https://www.audiophonics.fr/en/diy-dac/ian-canada-ess-sabre-90x8-controller-with-display-p-13970.html)
is available which enables DAC controlled volume (via i2c) it is
shown attached to the Khadas Tone Board 'here on Audio Science Review'
(https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-wesiontek-khadas-tone-board-dac.4823/page-73).
Many thanks for listening!
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