AVS Special Member
Join Date: Jun 2010
Location: Los Angeles, CA
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Here is the reply from Auralex:
The only difference between the SubDude and the GRAMMA is the
dimensions. The SubDude is made to accommodate an average subwoofer.
Placing your sub on 2 GRAMMA with a space between the two would not
affect their desired performance as the sub would still be decoupled
from the floor. Likewise, if the sub is resting on a SubDude and happens
to hang over the edges, it will still perform as desired, with the
stability of the cabinet being the main issue.