What is the difference between the "pro audio" amps that you usually find at musical equipment stores and home audio power amps. I recently hooked up a pair of Ashly amps to my Carver speakers because they appear to be built like a tank and put out a lot of watts. The sound was ok. I notice that these high wattage amps can be had for a lot less than a comparable home audio amp. Is is a matter of quality(sound) vs. quantity (watts)?