marble, granite, glass and your quartz countertop are kryptonite to your stereo equipmentYet you have speakers made from synthetic marble! What am I not getting?
Stereo equipment on wood is known to give the best sound.If this is such a well known "fact", then how come HRS, Sistrum, Arcici and Gran Prix (4 very well regarded stand manufacturers) don't use wood platforms?
Rather than talk in absolutes and make hyperbolic statements all I'm suggesting is give the quartz material a try and let us know how it works. I freely admit, again, that I'm speculating that it might work well.
(As a personal note, I do use maple boards under some of my equipment. I also use carbon fiber, MDF and acrylic. At one point I used 1" thick glass which when combined with rubber/cork mats worked well. I then switched to a Mapleshade wood/metal stand which was a definite improvement. I'm now seriously considering taking out all the maple boards and switching entirely to acrylic, except for the one carbon fiber piece.)