I've been playing bass for about 3 1/2 years now and I'm 17 now. I don't know much about amps so I need some help. I have a Fender BassMan 400 combo and I play a 4 string Peavy Fretted bass and a 6 String Carvin fretless. My friends band played a show recently and they used my amp. They are a punk style group. Their bass player had to crank my amp up really loud in order for us to hear him, and when we could barely hear him, it sounded distorted. Can anyone tell me why or advise me to get a new setup? Everyone tells me to get Ampeg, Ampeg, Ampeg. Any comments? Also, are 4 10's better than 2 12's?