The RM-X69RF can indeed be used as "just a controller"
by connecting the RCA outputs of the MDX-65 to another
device. Here's the catch: due to the way the MDX-65 gets
its analog ground, you have to at least connect the shield of
one of the RCA's on the MDX-65 to the shield of the RX-X69RF
RCA (either channel will work and the center pin need not be
connected). This requirement MAY already be taken care of
since the radio and the RM-X69RF have the same ground; it
was not on the powered speaker. My guess is that this so that
the MDX-65 analog circuitry gets a "clean" ground, rather than use
the "dirty" power ground in the Unilink cable. This probably helps
eliminate electrical noise from the various motors in the MDX-65.
I've got an XA-C30 3-input Unilink switcher on the way from
Sony (had to order it direct since no dealers seemed to know what
it was). If anyone's interested, I can report how this affects the
situation when multiple changers are hooked up to the RM-X69RF
in controller-only mode. My guess is that they still require the
analog ground (separate from the Unilink cable)...
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