I've actually heard the Supremes at CES and more importantly, I heard them at the new owners house here in Southern California. The amps used were Marten's own amplifiers, preamp was the EAR 912, digital sources were an Acute III cd player and the MSB digital stack (The $6k Acute III sounded much more analog and natural compared to the $85k MSB Stack which was a DAC IV Select, UMT Plus Transport. DAC IV Select has the FemtoSecond Galaxy Clock in it), top of the line HRS rack for the electronics and HRS amp stands for the Marten amps.
I was helping the EAR distributor and owner dial in the speaker and finally spike the speakers (which made a massive difference in imaging, a standing bass wave and overall coherency). Joe Kubala of Kubala Sosna cables joined us later in the day and we finally celebrated with a toast when all was dialed in to our taste
I took some iphone pics during the tweaking...I'll post them in a bit. It was a GREAT day and an experience I am thankful for.