Centre channel problem with DDTS-100

I have a set of Gigaworks s750 speakers connected to my PC, PS3 and Xbox 360 via the DDTS-100 decoder; up until yesterday this was all working fine. Having moved some of the gear around to accomodate my new desk, I plugged everything back in and found that the sound from the front centre channel is muffled and/or quieter than the other channels.
The speakers themselves don't seem to be the problem as the PC (which is connected via the switch box included with the decoder) sounds fine but the problem persists with both the PS3 and X360.
My first thought was that I'd pulled one of the cables loose while rearranging the furniture but I've re-plugged everything in several times since with no joy. I've also tried changing the spdif cables and switching the sockets around, as well as removing the switch box and plugging the speakers directly into the decoder but nothing made any difference.
Has anyone ever encountered anything like this before and/or could offer any suggestions?
Any advice would be much appreceated.

I finnaly found out my problem
The buzz came out from my coax cable from my DVD. My DVD player was probably inducing 60Hz on the coax output.
I switched to the optical output and no more buzz.
I'll need to buy a new toslink cable to plug my x-box on the optical input #2
Also I pluged my TV audio out in my st analog input, it also induced a 60 Hz on my DDTS-100. The decoder does not seem to filter out electric noises.
I'm pretty happy to have found out my problem but I'm very dispointed that the DDTS-100 does not filter any electric noises.
Mat

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