That's not correct information to say it friendly from your dealer.

He does like to work (to solve your problem) and wants to sell you his stuff.

Why the coax should not work when the MC200 is functional?
There are lots of owners out here at HH, that use or have used the coax without problems.

Robert

800v3/218/271/8k.2/5k5s smile /5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,