after i noticed Auralex launched Subwoofer Isolation Platform and you guys bought the product ... I did the research and realized there was a latest SubDude from Auralex ... i called Nelson about SubDude HD ... he said all taken out ... i told him i just need one piece
after work i went to his shop and did the comparison between SubDude and SubDude HD,
(1) the surface of material is different - SubDude is using ozite (rough surface), grey colour. SubDude HD is using velour (soft surface), black colour
(2) the height is different - SubDude is 3-inches. SubDude HD is 2.5-inches
(3) when physically put on the floor, the ground landing of SubDude HD is solid than SubDude (may be just my feeling, could be the height is lower) ... anyway Sky the staff there also feel the same with me
(4) SubDude HD is just slightly expensive than SubDude
later i shared my experience with Sky. i told him i position my Subwoofer (100W) on the tile floor and when i turn my amplifier (130W) to 40% volume, the plaster ceiling and wall partition are vibrating, and the boom (bass) sound very noisy (loss). he told me with SubDude HD, the performance definitely improve but not 100%. the vibration on plaster ceiling and wall partition still be there but lesser. fair enough, at least he honest to me. so i bought SubDude HD.
clean my Subwoofer. place it on SubDude HD. do testing. (1) test war movie on blu-ray (2) test war game on PS3. increasing my amplifier volume from 40% to 80% at 10% increment. the plaster ceiling and wall partition were not vibrating (at least i didn't feel it now). the bass sound was solid, no more noisy (loss) sound. i did not test over 80% cause it was very loud in the room. am very happy with the result. now i can enjoy movie and game than before.
hope my review help a bit on your decision to get Subwoofer Isolation Platform in near future.