Ian,
LOL. Yes, Barney, The Wiggles, and the worst of all: High School The Musical! Fortunately, they have yet to realize daddy's room can play their music and videos too.
Yes, I've tried swapping speakers. For example, I can just switch the center channel audio and the rear audio so the center will now play the Left rear and the left rear (speaker with the problem) will play center channel audio. The center speaker works fine. The problem rear, playing the center audio makes the same sound.
I don't think its an actual driver thats blown because the same sound comes from the tweeter, mid and bass units. I think there is something gone wrong with the electronics for this specific speaker. It passes along the other channels audio just fine (its the "master" of the two rear speakers).
Tried re-typing it, etc. No luck

. My dealer and Meridian USA are going to figure this out because at this point I am out of options on my own.
Please keep the thoughts coming!!!
best regards,
Jerry