Orion HP-2800 Owner's Manual page 16

Three Channel (Channel 1, Channel 2, Bridged)
Channels 1 and 2 are configured for two-channel stereo operation.
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Front channel lowest recommended impedance is 2W stereo.
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The third output is configured for a single channel bridged output.
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The bridged outputs lowest recommended impedance is 4W.
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Outputs are configured for high-pass, low-pass, or full range operation.
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SPEAKER
BRIDGE
+ - +
1CH 1CH 2CH
-
2CH
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