Hi.
The first step is ensuring that it does not depend on the speaker.
I assume that talking about center speaker you do not refer to a sub-woofer, but to a 5+1 surround system center speaker. In that case the center speaker will be passive, and can be swapped with one of the side speakers.
Ensure that center speaker wires are connected properly, and that positive and ground are not inverted.
Try swapping the center speaker with a side one, so to see if the problem depends on the speaker. If the problem depends on the speaker, then replace the speaker.
Use the same technique to test the speaker wiring (if this is not integrated with speaker). Swap cable and eventually replace wires if defective.
If the problem does not depend on the speaker, then the DMR 60 is faulty. Probably a contact or a faulty component on audio output circuit.
In that case, instead of disassembling the unit and starting to test , I suggest contacting Jamo, at the number written on user manual, and getting the unit replaced or repaired.
If you cannot find your local Jamo contact , write them an email at
[email protected]. , or see Contact.