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DD20 odd behaviour: high-pitched constant whine in specific wiring situations
Hi everyone,
I'm finally at my wit's end - so the only possible solution left is to
ask you:
My Boss DD20 has for a long time been integrated into a setup centered
around a Mackie 1202 VLZ Pro mixer (aka "Nerdville Setup"). After
remodelling that setup recently ("Nerdville 2.0"), I considered a
constant high-pitched shrieking sound emitting from the DD20.
The sound is also present if there are no inputs connected to the DD20,
or if all other connections to the mixer are removed. The sound remains
if I connect the DD20 to different inputs of the mixer. Trying different
cables doesn't help, either.
The sound does not appear in the DD20's headphone connection, and by
using an unbalanced (TS) cable instead of a TRS cable to connect the
DD20 to the mixer.
So the short version: workaround defined (using TS cable). However, I'd
prefer to know what is happening here.
Any ideas?
Rainer
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