Help with hookup

@fortin, your original post indicated the " m " before the c2300. The mc2300 is a power amp, which is why the question was asked. Now that we have that out of the way, describe to us the hook up, please, so we can help you. 

As the meters on the mc352 are responding to the signal from the preamp, I suspect " it " is at the amp end. What are the speaker wire connections you are using, both at the amp end and the speaker end ? If you are using bare wire, make sure enough insulation has been removed from the cable ends to make contact, but not so much, that the positive and negative wires are touching ( I am sorry, I have seen this a few times in my lifetime ). This scenario will short the output ( no sound ). Was the equipment working properly, as far as you know, before you acquired the pieces ? Sorry for the questions......just part of trying to help.....

The puzzling thing about all of this is, the power amp meters are responding to the signal from the preamp, so, the amp is receiving signal. It needs to be at the power amp, somewhere, or, the speakers themselves. I am with twoleftears and yogiboy, on this one....

You might want to try single ended connections between the preamp and amp ( rca to rca ).