in the last 6 months, sub wise i went from 1 hdc3 18 to 2 hdc3 15s back down to a single sundown zv3 18 lol..... Amp wise in the last 6 months or so, i went from a Soundstream Dtr1.3400 to a Memphis mojo 4kw to now a crescendo bc3500. yea alot of changing lol