For my SP10mk2, I had a custom machined SS mat 4kg, 292mm diameter and 8mm thickness made by Tran Van tan <tvan_tan@yahoo.com.vn> for $200USD. He is quite skilled at making a variety of metal turntable parts for vintage tables(e.g. Micro Seiki,) at reasonable prices and of excellent quality. I considered copper, ss and two layer combo of the two. The mass & height considerations led me to choose the lowest price option of the three, ss, which gave me great additional mass but not too much for the SP10mk2 and provided the height that allowed a wider range of VTA adjustment when using my EPA250 arm.
After @dgarretson brought his ss and copper mats over and we listened to each and both, we found about 5kg was max weight that we'd be comfortable with and in general the closer we got to that amount the better the sound in terms of LF performance.
His work can be found here: https://vnav.vn/threads/tvt-analog-shop-chuyen-cac-phu-kien-ve-dia-than.30728/page-11#post-1426052
Cheers,
Spencer
After @dgarretson brought his ss and copper mats over and we listened to each and both, we found about 5kg was max weight that we'd be comfortable with and in general the closer we got to that amount the better the sound in terms of LF performance.
His work can be found here: https://vnav.vn/threads/tvt-analog-shop-chuyen-cac-phu-kien-ve-dia-than.30728/page-11#post-1426052
Cheers,
Spencer