After a quick search I found this
Demo by Shunyata funny enough at my local hifi dealer who at my last visit looked at me like I was a idiot for using M DSP speakers

A while ago I had a talk with the technician from Viertron which is the dutch distributor of M. He told me that the mains cable can make a difference. Mostly because the normal cables have thin 0,75mm2 conductors which can supress the dynamics when higher currents are asked by the amp. So thicker conductors could help and some shielding could also help. Does it make a big difference? To some its a world of difference to others not even noticeable.
Perhaps comparable to having your 267.8 MPH Bugatti Veyron tuned for 100.000 to go 7 MPH faster. A world of difference for some drivers and not noticable and worth the money for others.
For me a nice supra cable or the cheap LAPP ÖLFLEX CLASSIC 3 x 2,5mm2 makes sense, puts me at ease... I've used the LAPP from the fuse box to the dedicated audio wall socket which is only 4 meters so not too much trouble to do so. Does it sound different, I didn't bother to check but it was only 20 euro for 4mtrs of shielded cable.