MDF sand box tweak - effective for DAC, pre-amp?

I use the sand boxes for Pre-amp and Monoblocs. I found the sandbox sucked the life out of my cd player. I had better luck with the BDR #3 Racing cones under the cd player. If I had to do the sand boxes again, I'd use Corian on top of the sand instead of MDF. I sprayed the sand boxes with high gloss black (piano black). It took 5-6 coats because I forgot to use primer! So save yourself some time and get some primer to saturate the MDF before spraying with high gloss. They look really beautiful. Talk to your local kitchen outfit about using their kitchen sink Corian cut outs for your sand boxes.