Help - Cable for High End System - M7s and Block Audio Mono A

I would contact Magico to get their recommendations for this combination.  They can help create a shortlist of candidates based on the owner's sound preferences.

I really like the Silversmith cables. Friend uses sets in his system, ($400k system). I like them enough that I’m also buying a set for my Magico's. Granted not M7's only messily A3's. But I find them exceedingly good for the money. They are a ribbon type no box’s etc.

FIDELIUM SPEAKER & INTERCONNECT CABLES. Thin foil (ribbon) design derived from electromagnetic wave and waveguide physics to minimize skin-effect phase errors. The skin effect properties of FIDELIUM are up to 33 times superior to copper or silver.

After many, many years of cable-auditioning, the cable merry-go-round has stopped with Synergistic Research - upper tier series.  It provides the best SQ for my revealing system.  Now, I just smile when listening.      Excellent customer service!

I think you and he are in the realm of dealer recommendations, and multiple trials/demos to get the sound he is looking for. I assume that is where the speakers and amps came from? 

But one suggestion I can add is he may not need speaker "cables", if he has mono blocks, as long "jumpers" may work, and one can save many thousands by not looping up an extra 2m of unnecessary cable behind the speaker. Don’t think the dealers encourage this though. 

For example, Nordost Valhalla 2 make a 27" jumper for about $6000 US. 

Another voice in the cyberspace wilderness for Cardas Clear Beyond.  Not to confuse things but there are many fine ones with subtle differences. Room A#1 variable.