The CT4150 is a rackmountable 4 channel amplifier for smaller events. From the Manufacturer: Powering this remarkable amplifier is the pioneering technology of DriveCore™, which integrates the amplifier drive stage into the power output stage fusing everything into a chip the size of a dime. DriveCore's front-end drive circuits leverage the inherent efficiency of Class D output stages while also maintaining superb sonic characteristics. The end result is an audio amplifier circuit that exhibits the exemplary audio quality of a highly evolved Class AB design. Features: Flexible Input Routing Convection Cooled Universal Power Supply Integrated Life-Safety Features Up to 8X125W in 1U chassis with no fan DriveCore™ technology provides >90% efficiency with no compromise in performance Patented Feedback and Protection Circuits Amplifier is stable for 2 – 16 Ohm Loads XFMR 4/8 needed for 70V/100V Applications Specifications: Channels 4 Sensitivity 1.4 V Rated Power Output (all channels driven) 125W per CH @ 4 ohms, 125W per CH @ 8 ohms Signal to Noise Ratio (below rated power 20 Hz to 20 kHz, A-Weighted) 110 dB THD (full rated power, 20 Hz - 20 kHz) < 0.05% Intermodulation Distortion (from 0 dB down to -30 dB) < 0.05% Frequency Response (at 1W, 4/8 ohms) +/- 0.5 dB Crosstalk (below rated power) 20 Hz to 1 kHz > 70 dB Common Mode Rejection (20 Hz to 1 kHz) > 55 dB, typically > 70 dB Voltage Gain 27 dB DC Offset +/- 20mV Idle Power Consumption (Standard Mode) 17.5W Dimensions 1.75" x 19" x 15.19" Weight 10lbs/4.54kg Shipping Weight 15 lbs/6.8 kg IEC Power Connector 15A