CREST CD1500 POWER AMPLIFIER The CD Series amplifier is the next generation of elevated efficiency amplification from Crest Audio. The CD Series combines a linear power supply and a Class D output to deliver power in a compact and cost-effective package. This series is versatile, whether powering nightclubs, raves or rocking it at a high school gymnasium, the CD Series brings a new generation of amplification to Crest Audio. A traditional linear power supply is used in the CD Series. Because of the efficiency of the switching output stage, the transformer does not need to be big or heavy. This gives the CD Series an advantage in delivering huge power in a compact package. The efficiency of the output stage also gives the power supply the ability to handle heavy duty cycles without compromising sonic integrity. Crest Audio's engineering has also maintained sonic quality while incorporating the advantages of a switching output stage. High-power Class-D topology is the key to its efficiency and low operating temperature. An additional advantage to this design is the amount of power needed over time. This amplifier will dramatically reduce the number of kW / hr needed for operation CD 1500 Dimensions 19" W x 3.5" H x 15.375" D (483 mm x 89 mm x 391 mm) Weight 37.2 lbs. (17 kg) 8 Ohm Stereo - 400 W 4 Ohm Stereo - 750 W 2 Ohm Stereo - 900 W 8 Ohm Bridged - 1500 W Dramatically reduced net weight Linear power supply / Class D output stages Very low current draw Latest generation of high-speed, mosfet output devices Cooled by variable-speed fan with back-to-front airflow Inputs: balanced female XLR, 1/4" TRS combi jacks Outputs: Speakon® and five-way binding posts Mode selector switch for stereo, parallel and bridged-mono operation Ground-lift switch and rear panel circuit breaker Recessed, stepped attenuators with removable knobs 16-gauge steel chassis, cast aluminum front panel TourClass protection circuits ACL (Active Clip Limiting) prevents speaker damage by providing gentle gain reduction when signal approaches the clipping threshold IGM(Instantaneous Gain Modulation) monitors speaker loads to detect conditions that may over-stress output devices, allowing safe operation into nominal 2 Ohm speaker loads AUTORAMP gradually increases gain to the attenuator level-settings when the amplifier is turned on, preventing abrupt turn-on levels Other protection features include: short circuit, DC voltage, comprehensive thermal management, current in-rush turn-on/off transient and sub/ultrasonic input