i dont know a whole lot about this so if someone could clear this up for me that would be great.

awhile back i was reading info on different amps for the preout use, and it sad "for more power use the preouts"

and i remember along time ago when i was looking at buying a receiver and i got the yammy 5650, the salesmen told me that the 5660 had preouts and that i could run an old tube amp into it and it would filter the power and use it for the fronts as well as the yamahas 80 watts, i know some amps have "ampli inputs" where you run the amp in. but the 5660 does not have that. so how would you be able to run a stereo amp into "AND use the yamahas power as well, is that possible" i know you can hook up a stereo off the preouts instead of using the amp, and just use it as the brains of it all. was the salesmen confused or something? and thought it had amp input?