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do not understand setting the SW to +3, because then you have less room to adjust your reciever bass if you want to...
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The adjustment is there to use for this exact situation. Once it's set for your equipment, you'll not likely need too much further trim.
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Why not just set the SW to 0 on the AVR, then sub vol to match your mains.
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Because you'll not be taking advantage of as many bits as possible in the BFD.
As you decrease the input signal, the noise will rise exponentially. Once the LSB and other low order bits are gone as a result of the low input voltage the A/D is no longer a 24 bit device, but a lower bit device, producing higher noise figures. Digital electronics may have gotten better, but the math has not changed....
brucek