Power Acoustik Vertigo car amplifiers are the next step in performance and value. Taking advantage of the tried and true Class AB full range amps and improved efficiency Class D monoblock platforms, this Vertigo Series 1,800 Watt 4 Channel Class D Amp is an ideal addition to your vehicle. You'll find this full range amp will continue down the Power Acoustik road of reliability and longevity for years to come. Vertigo Amplifiers: The next step in performance and value. Taking advantage of our tried and true class A/B full range and improved efficiency class D monoblock platforms, Vertigo amplifiers continue down the road of reliability and longevity you know well. Specifications: Max Power Rating of 1800 watts, 4 Channel Full Range Car Stereo Amplifier. Can be bridged @ 4 and 2 ohms. More Specs: MOSFET Power Supply w/ Audiophile Grade IRTM Transistors built on Military Grade SMT PCB. Made to Maintain Dynamic Performance and equipped with Direct Short, Thermal, & Overload Circuits Protect Amplifier Frequency: This car amp has a Variable 12dB High Pass, Low Pass, & Subsonic Crossovers which allow this 4 channel amplifier to use 12dB Bass Boost Increases Low Octave Harmonics. The Car Amplifier has Dimensions of (2?H x 8.75?W x 11.75?L) MODEL NO - VA4-1800D