I disagree on watts not mattering. I make my own custom speaker boxes for car stereo's and home units. Using blaupunkts speaker deseign program. Watts on a cheapo amp at 400watts will be beaten by a good amp at 100watts. Its the real power of per watt that matters. Take a radio shack 400watt amp. Now run it compared to a alpine or kenwood 200watt amp. Betcha $1000 the kenwood and alpine push the speaker 10x harder than the cheap amp does. So watts does matter alot. But good watts are most important. Without high power you dont drive the speaker cone good. Not moving the woofer much creates less air movement = less sound.