Auralex SubDude HD - Subwoofer Isolation Platform

@Rabbinoah,
What are the dimensions of the smaller platforms? I have looked around and can only find the 15x15 and those are much too large for the small floor standing speakers for which I would use the platforms.

I bought a bigger Auralex platform, then I just used a circular saw to cut it to size.

I use them as amp stands. They seem to do the trick!

I use the Auralex SubDude HD for the subs in my 2.2 channel majority music system and an Auralex Great Gramma for my HT Sub and they have really helped. More so in the HT system I heard improvements with the bass.

Has anyone used Auralex SubDude platforms under tower speakers ? How did they influence/change the sound or were there any benefits at all? Thanks in advance.

Thanks for this post as I'm in the process of getting a pair of subs. Can anyone tell me the real difference between the SubDude and Gramma? I understand one is for sub and the other more for monitors but on their website there is a review link on the Gramma where the reviewer uses the Gramma for his sub:

http://www.hometheaterhifi.com/volume_11_2/auralex-gramma-4-2004.html

The review is old 2004, so may be they didn't have the SubDude back then. My subs have foot print of 17.25" square so the bigger Gramma will fit better, if both attenuate the same frequencies.