Originally Posted by Bond 007
What kind of floor do you have? i.e. tile over concrete, etc. Did you notice any sound improvement from the sub? Some people claim they get better low end. I have my RW12 sitting on a folded bathroom rug which is an improvement over the bare tile floor. Although a Gramma would look much nicer I am not willing to spend that much simply for appearance. If I thought I could get any significant sound benefit over just the rug then I would do it.
My floor is suspend over the basement, in a 60 year old house, so not the sturdiest of foundations for pounding bass. Old windows don't help the cause either.
Bare tile flooring is one of the worst things you could have, so placing your sub on anything to separate the two will be of value. The Gramma would be a better isolator then your bathroom rug, but it's tough to gauge "significant sound benefits" I'm afraid.
In my case there's no placebo effect; the Gramma has made a noticeable difference. Only rarely does anything in my room rattle now, which is a far cry from what it once was. I would say the sound is a bit cleaner, but that's potentially due to the lack of extraneous noises and subsequent drop of resonance.
I do think Auralex charges too much for it though. If you're a competent DIYer I'm sure you could closely approximate it's capabilities for half the cost. I don't think the SubDude and Gramma are properly sized either; neither of them seems wide enough for a surprising percentage of subwoofers (at least the ones I've been getting lately). But for me -- and countless others -- isolators are a worthwhile thing to have. If you aren't a DIYer then it's pretty much the only choice it seems.