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LH1000 Using BRIDGE and Dual Parallel Modes

The LH1000 amplifier is constructed using two 500 watt power cores. Depending in the position of the BRIDGE mode switch, the amplifier can run in Dual Parallel mode, or Bridge mode. In Dual Parallel (BRIDGE mode switch to the left), the two amplifier channels are receiving the same input signal from the pre amp, but are operating separately, so each channel sees its own speaker load. In BRIDGE mode (Bridge mode switch to the right), the two amplifier channels work as one and therefore, a single impedance load from the connected speakers is presented to the amplifier.

Always be sure to check the manufacturers recommended power handling of your speaker cabinets to match the best impedance load and power output ratings.

If you are using the LH1000 with a single cabinet of 4 ohms or 8 ohms, set the BRIDGE mode switch to BRIDGE and use a standard Speakon cable to connect your cabinet.

If you are using the LH1000 with two 8 ohm cabinets you can use the LH Series in Bridge mono or Dual Parallel.

If you are using two 8 ohm cabinets as a 4-ohm single load, switch the BRIDGE mode to BRIDGE and use a Speakon cable to connect your first cabinet, then use the cabinet's extension output to connect the second cabinet.

If you are using two 8 ohm cabinets in Dual Parallel mode, be sure the BRIDGE mode switch is in the off (left) position and make your connections using both channel A and B 1/4-inch output jacks.

If you are using two 4 ohm cabinets, you MUST use the LH1000 in Dual Parallel mode (BRIDGE switch off to the left) and connect one to each channel of the LH1000 using the 1/4-inch phone jacks.

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