This package that we have put together is popular for mobile disco's, bands and performers alike, It comprises of two active Carlsbro Gamma 15 Avtive Subs witha massive 600 Watt Amplifiers built-in, two matching Gamma 15 Active 400 watt full range top's with 15" bass drivers and compression tweeters. Huge amount of power and bass in a handy all-in-one package!!....and don't forget, the amplifiers are built in.