Hi, I'm an audio novice who has this current set up. Yammy Rxv730 AV receiver (75W pc) plus Paradigm studio 80 and studio 20 as my surround set up. My audiophile friend tells me that I'm underdriving my speakers with my receiver and recommends a separate amplifier. He thinks the current receiver brings out only 50% of what my speakers (6 ohm) are capable of playing. I'm no audiophile and don't have much to spend (maybe $500) but if a decent "used" amplifier can bring my speaker sound to another level I am willing to drop some dough.. So will $500 budget amp bring that much of an improvement over my receiver -- that is...an improvemnt that even a novice can hear? Also, if so what amps "used" under $500 do you recommend? Thanks in advance.