JL Audio HD900/5 - 100 Watts x 4 + 500 W x 1 Class D 5-Channel Car Amp AmplifierJL Audio HD900 5 100 Watts x 4 + 500 W x 1 Class D 5 Channel Car Amp Amplifier 5 Channel Class D System Amplifier, 100 W x 4 + 500 W x 1 Thanks to its ability to act as a "one box solution", the HD900 5 is ideal for installations where space is at a premium and sound quality is the paramount goal. While extremely compact, this amazing amplifier will comfortably drive a complete high performance car audio system: that is, four satellite speaker systems