The Rumble Stage 800 amplifier’s high-power class “D” amplifier operates in bridge mode, meaning that voltage is present in both terminals (+) and (-). Use caution when connecting a speaker cable to the External Speaker output on the rear panel—never let the tip (+) or sleeve (-) of a speaker cable (see illustration below) contact the amp’s metal chassis or any other earth-grounded electrical equipment (i.e., audio mixers and other sound reinforcement devices). A speaker cable plugged into the amp’s External Speaker output should be connected only to another speaker cabinet.
Use caution when connecting 1/4” speaker cables with non-insulated (bare metal) plugs—always make speaker cable connections with the amp’s power turned off.
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