I left my feet on...truth be told, I didn't think about taking them off and just thinking about having to move that beast now....well, um...er, the feet be stayin' on...
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The additional height wasn't an issue for me.
With the metal grill protruding out like it does, the sub fits nicely on the GG. The sub is positioned next to my couch and acts like an end table with a lamp on top.
Yes, there's a current post on AVS about the guy who took off the feet...