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RE: My DIY Story: nanoDIGI DSP based active crossover and 4 subwoofer integration

Posted by dumpingground on March 22, 2019 at 06:50:52:
For music listening, my volume control is done in the digital domain with jriver mediacenter software. I do not use the nanodigi for volume control. The nanodigi input/output levels I believe are set to -1 db for a little safety margin for clipping. The one exception is the nanodigi channels feeding the HSU subwoofers. Because I am implementing the HSU bass optimizer filter in the nanodigi, I needed to account for the 6.5db gain of the filter and possible clipping when listening at max volume. I have a -10 db level set on the output of that channel in the nanodigi. I then increased the level control in the Crown power amp for the HSU's to level match my SVS and HSU subs at my listening position.
To reduce the issue of loss of bits, I have the analog level controls on my Parasound HCA-1000A power amps set down a bit, such that with the jriver volume control is near 90% at my max volume listening level. Such that the loss of bits for reducing volume is minimized.
When in Hometheater listening mode, I use the Yamaha AVR for volume control. I have the Yamaha front left/right preout gain settings bumped up a bit so that the approximate signal gain when going thru music or HT mode is the same. So that I don't blast myself when switching modes with my remote between the two volume schemes.
In summary, the important thing to do is to set max volume prior to the level of clipping in your entire audio chain from source leading upto your power amps. Assuming you have gain controls on your power amps use those to reduce the volume to whatever your max volume listening level is. That way the attenuation require in the digital domain is reduced just to fine tune volume level for whatever you are listening too.
There is an interesting posting here that talks about the issue of loss of bits. Basically try and keep your digital volume attenuation to less then 20db with a 24bit resolution DSP and DAC system.
http://archimago.blogspot.com/2019/02/musings-why-bother-with-24-bit-dacs.html