Hi Dave

The input you refer to is NOT a mic input, it's a stereo line input. If you plug a normal mic in it will be low on output and will only output to one speaker. To use the input effectively you need to run the mic though a pre-amp which converts the signal to stereo and boosts the signal.

I use mine with either a Korg iH or a Digigitech Workstation Ex vocalizer and it works really well. Output goes to a pair of Behringer B212d active speakers.

Kind Regards

Col