4ch 1000 Watt Motorcycle Audio System Stereo Four Quality Speakers Chrome. Handlebar Clamps Included 4 channel 1000 watt motorcycle audio system. Includes amplifier, 4 speakers and handlebar brackets udio input: AUX and RCA HI PASS adjust range : 40Hz to 400Hz Adjustable volume of Rear Adjustable volume of Front Ajustable Hi Pass and Low Pass. Everything in this system is waterproof, but the amplifier. fits all handlebars 7/8" 2 1/2 inches VoiceCoil Impedance: 4 Resonc Frequency: 165HZ Effective Frequency Range: Fo-12kHZ Puiput Sound Pressure Level: 88dB Distortion: &lt;= 5% Easy install. Everything you need to install this system is included