Stereo Operation

For stereo (dual channel) operation, turn the amplifier OFF and set the mode select switches on the back panel to the out (extended) position. In this mode, both channels operate independently of each other, with their input attenuators controlling their respective levels. Thus, a signal at channel A’s input produces an amplified signal at channel A’s output, while a signal at channel B’s input produces an amplified signal at channel B’s output.

Bridged Mono Operation

Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use extreme caution when operating in the bridged mode; potentially lethal voltage may be present at the output terminals. To bridge the amplifier, depress the rear panel Bridge switch to the IN position. Direct the signal to channel A’s input and connect the speakers across the hot outputs (the “+” binding posts) of channels A and B. Only channel A’s input attenuator is active while in Bridge Mono mode. Unlike the stereo mode, in which one side of each output is at ground, both sides are hot in bridged mode. Channel A’s side is the same polarity as its input with the minimum nominal load impedance being 4 ohms (equivalent to driving both channels at 2 ohms) in bridged mode. Driving bridged loads of less than 4 ohms will activate the DDT™ circuitry (see Indicators section), resulting in a loss of power, and may also cause a thermal (overheating) overload.

Distortion Detection Technique (DDT) Limiting

Any time a channel is driven into hard, continuous clipping, the DDT circuit will automatically reduce the channel gain to a level just slightly into clipping, guarding the speakers against the damaging, high-power, continuous square waves that may be produced. Situations that may activate the DDT circuit include uncontrolled feedback, oscillations, an improper equipment setting or malfunction upstream from the amplifier. Normal program transients will not trigger DDT; only steady, excessive clipping will cause the DDT LED to illuminate.

Features

• Two temperature-dependant dual-speed fans
• 1075 watts (rms) per channel at 2 ohms
• 760 watts (rms) per channel at 4 ohms
• 495 watts per channel at 8 ohms
• 2150 watts per channel at 4 ohms bridged
• 5-year warranty
• 2-rack-space stereo power amp featuring DDT™
• Weight Unpacked: 36.30 lb(16.465 kg)
• Weight Packed: 42.00 lb(19.051 kg)
• Width Packed: 5.75"(14.605 cm)
• Height Packed: 22.75"(57.785 cm)
• Depth Packed: 21"(53.34 cm)