#2
If I remember correctly, the power amp is what actually powers your speakers and send the sound through them.

So, if you don't use it......

You're pretty much going to be silent
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How do you say "I'm okay" to an answering machine?

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#3
boosts line level from the preamp section to speaker level.
Guitars
Jackson Rhoads EX
Jackson RR3

Amp
ENGL E530 preamp
Peavey Classic 120 power amp
Randall Cab