I am little disappointed with the quality. It didn't produce bass with my Hifonics 500 watt amp and popped hard(not a bass hard) with my Kicker 300 watt amp. I eventually put the speakers in a real small box with an Old School Fultron ME50 amp and achieved mid bass at medium levels. It is what it is for the price. They will produce bass, just not clean, responsive, as a sub should to maintain a companies reputation.