Agree, but in this case you HAVE to plug the cables from the main/monitor out in to the power amp, having a different plug for the speaker out, in this case, makes sense, IMO. Is not internally wired like an amp.
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When the drunk guitarist plugs his 4x12 into his tube amps send or footswitch connector he blows the AT with the first power chord. Don't drink & play, and you don't need stupid connectors!