HELP - my speaker just turned into a radio

I just got my new EAD TM8000 today and hooked it up to my Classe CA300 amp driving Innersound ISIS speakers. There's more to the setup, but this seems to be the only relevant part.
EAD has balanced outputs to front speakers, so they give you a balanced - RCA plug to put in there.

First try

hook it up and turn on the amp first - the left front ISIS is humming slightly, nothing too bad.
turn on the EAD and the left speaker is now a radio

turn off the EAD. 15 seconds go by and it clicks and then the radio is gone, but the humming remains.
turn off the amp and switch the cables at the converter plugs from left to right to see if it changes speakers.
turn on the amp, the right speaker hums
turn on the EAD and now the right speaker is a radio

turn it all off
and now I switch the IC's on the amp end from left to right
turn on the amp, the LEFT speaker hums
turn on the EAD, the LEFT speaker is a radio

turn it all off

pull the IC and cable for the left speaker and route them to the ADCOM I have driving the center channel

turn it all back on

no problem

what the heck is going on?