HELP - my speaker just turned into a radio

Here's the whole troubleshooting picture a little more organized
I need some help troubleshooting my new set up.



Classe CA300 – driving front speakers
ADCOM GFA750 driving the center and surrounds
EAD TM8000 – new gear
Sony DVP 9000ES DVD/CD player
Innersound ISIS front speakers






I got the new EAD and connected it up just as it states, very simple. The outputs go to two amps and one digital cable between the EAD and the Sony.



It has balanced outputs for the front speakers, so they give you balanced/RCA adaptors to plug into the EAD first, and then plug the RCA IC’s into them.



I connect the IC’s and digital cable.





I turn on the amp and the left ISIS is humming slightly. I turn on the EAD and the left ISIS is a radio and what’s worse it is picking up this real asshole talk radio guy whose program and attitude I just detest L



I turn off the EAD, 15 seconds and it clicks, the radio goes away and the speaker just hums. I turn off the Classe and the humming stops (duh)



I switch the IC’s at the adaptors to see if it follows the cable and switches speaker.



I turn on the Classe and the right ISIS is humming. I turn on the EAD and the right ISIS is now a radio – same station (rats).



I turn off the EAD, 15 seconds and it clicks, the radio goes away and the speaker just hums. I turn off the Classe and the humming stops (duh)



I switch the cables at the Classe end and it moves back to the left speaker.



I switch the adaptor plugs, no change.



I change the IC out and try a new one, no change.



I move the left channel (IC and speaker cable) from the Classe over the ADCOM and the problem went away.



There seems to be something about the EAD left channel and the Classe left channel that are causing the speaker to be a radio.



The Classe is behind the speakers and the ADCOM and EAD are to the right in a rack.



Now what?



Sitting here scratchin’ her head -

I've been having this problem for a while.
It got worse a few weeks ago, here's a post on why this may have been (very interesting stuff):

http://www.audioasylum.com/audio/general/messages/210722.html

Try using a cheater plug to defeat the ground leg of the plug on the power cord where it connects to your electrical outlet.

Does the CA300 have a switch for selecting RCA and balanced. If so, it should be selected to balanced if you are using balanced cables. If you are using RCA cable, make sure that pins 1 and 3 of the CA300 XLR connecotrs are shorted oterwise you may have some humming and other nosie problems.

Also on the EAD RCA-XLR adaptor, pins 1 and 3 should be shorted together.

Good luck.

Viridian - I do already. But you are on the right track. I just had someone mention ground loop to me and I got to thinking... I started plugging the Classe into different outlets and VIOLA - after 2 tries, it is GONE. No hum, no radio!

CASE CLOSED SHERLOCK!

KP, have you tried to plug stuff in in different outlets? I am assuming that I got off the circuit where the EAD is and that was the problem.
off to break in the new processor! YEAH