Originally Posted by Edwoo
Hey guys, I have a 1980's era Yamaha M-70 200wpc/2ch power amp with level knobs for both L/R channels. I've been trying to find out what the appropriate setting/level should be when used in conjuction w/my AVR's master volume. Should the amp's levels be turned all the way up, necessitating only incremental adjustments on the AVR's volume knob? Or should the amp's levels be turned down, while cranking the AVR's volume higher?
I read somewhere that it's important to "match" the levels between the amp's gain and the AVR's/pre-pro's volume for optimal sound quality/minimal distortion. How do I perform this matching or can someone direct me to the appropriate forum or thread that addresses my question? Thanks.
I will tell you what I know.
A lower gain is good in the sense that it will require more signal from the pre amp, which "may" reduce noise.
Too low of a gain, could result in pre amp clipping. In other words, if you had to turn your AVR way up to get sound from the external amp, or if the L/R channel trims would have to be set high that can be bad too, IMO.
Too high of a gain could make it harder to match with your internal amps. Unlikely, as most AVRs have pre outs on the low side, so the likely situation is that you will need to max the Yamaha amps' gain.
Therefore, starting with max gain seems like a good starting point. Try to balance your system that way, and if your channel trims seem reasonable (close to 0 as opposed to +12 dB or -12 dB) you are good.
If your channel trims are high, that means you don't have a good match. I think in this case, you would lower Yamaha amp's gain (if I am thinking about this right.)