It can be difficult to use a CFL friendly unit w/ Marantz equipment. The carrier freq for most Marantz gear is 35 or 36kHz (helpful when setting up a CFL friendly receiver), for comparison Sony & Pioneer are 40kHz (typically) and RCA is 28kHz.
Second, using the rear panel input w/o a Xantech interface (794-50) and grounding G2 to the chassis leads to inconsistant results.

jcmitch