[sdiy] supply voltages and signal levels

[Roy J. Tellason]

I see the supply voltage issue coming up in the OTA thread,  and in much of 
this stuff that I've encountered it seems that 15V dual supplies are the 
norm.  Or maybe 12V,  or even 10V,  in some stuff.

I also see signal levels quite commonly being around 10V P-P.

Is this really necessary?  Are we looking at things degrading that much if we 
were instead operating at "line level" or similar?

Maybe I'm just missing something here...