Hi,

Welcome to the forum sorry to hear you're having some problems.

The Yellow LED indicates the input sample rate:
Off is standard sample rate (44/48K)
On is high sample rate (88/96K)

If it is flashing it sounds like the DSP's are losing signal lock on the input signal.

It is possible there is a problem with the DSP's, but let's try to rule that out by a process of elimination.

How long have you had the DSP's, did they work ok before you added the MC200?

It could be a faulty RCA cable.
What type of RCA cables are you using (make sure they are for a digital signals)?

Something for you to try, use the DSP User Guide as reference (download from Duncan's Info site if you don't have it).

Try a different RCA cable and retest.

Re-TYPE both DSP's (TYPE=1 Standard setting for 2-channel system)
Reconfigure: Left/Right, One MASTER, One SLAVE.
Retest.

If still no good, try switching the MC200 over to the input of the other DSP.
Retest.

When testing note the yellow LED's on both speakers (do they both flash or just one).

Regards,
Carl

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