Dual mono set up

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There are no benefits in a mono setup, even on mono recordings with Phantom. You can't compare the Expert amplifiers with the Phantom. Dual mono in the Expert line means there are two separate amplifiers, one for the left channel and one for the right channel, sharing no circuits, in one box to avoid cross talk between the channels. Mono in Phantom terms is a combination of the left and right signal to be able to get all the sound information from a stereo signal with only one speaker.