Crescendo Audio C2000.4D All Concerto D series amplifiers now feature our newly designed 2018 BC/Concerto heatsink case! 4 channel Class D Full Range AmplifierCapable of over 1040rms bridged x2 @ 4ohm of pure Class D power!Highpass/Full/Bandpass 100% Custom Designed Active capable Crossover network with x10 multiplier switch Custom 24db defeatable crossover network with up to 8khz highpass/lowpass settings 2ch/4ch selector switch to eliminate the need for "Y" cables when bridged Quiet, Variable Speed Fan for Efficient CoolingIndividual Clipping Indicator for each channel located on side panel Custom tooled, proprietary Multi-piece Thermal optimized Heatsink with patent pending interlocking slide-out CNC engraved top plate.2 stage copper anodized removable top plate.Silver plated high end hard-wired Tiffany RCA inputs for optimal signal fidelity for both Inputs and Outputs 1/0 Power/Ground Inputs for efficient current transfer.Overbuilt Power supply with heavy copper traces and Military spec PCB/heavy duty standoffs for extreme vibration resistance.Manufactured using some of the highest quality and most reliable electrical components, with many 3% tolerance components throughout. You may interested in: Crescendo Audio Un-12- 12" Loudspeaker - 8 OHM C2000.4 Rated Power Output(RMS) Clean RMS power on 13.8v standard electrical system: 300w x4 @ 4ohm520w x4 @ 2ohm1040w x2 @4ohm Bridged Incredibly compact footprint! Dimensions : 15" x 2.75" x 9.5"