To Doug Schneider,
Currently I have a system that consists of a Yamaha 85Wpc six-channel receiver, a Panasonic five-disc DVD changer, a pair of JBL Northridge ND310 speakers, and a JBL PB12 powered sub.
I am not that impressed with the wholesomeness and depth of the sound quality. I think I need to get a multichannel power amp. What is a good amp I can get for around $600?
You mention that you need a multichannel amplifier, which usually means three or more channels, but by the looks of things you might only need a stereo amp, meaning two channels, because you only mention the ND310 speakers. Perhaps you have a center-channel as well as surrounds that you just didn’t list.
Nevertheless, you probably can do better than your Yamaha receiver with either a separate preamp-processor and power amp, or even a better receiver, since there are far better ones than you have. Your budget isn’t that high, so if what I am recommending blows by it, remember that you can always shop on the used market and get a substantial discount. Brands I’d look to first for power are Anthem, NAD and Emotiva. There are many others, but checking out what those companies offer will give you a great start and, I'm pretty sure, a significant upgrade over what you have. . . . Doug Schneider