Originally Posted by TRIPTON80
Let's see if it works?
I saw your post of these photos in the SVS Ultra 13 thread, and that it only cost you $20 to build... looks really
clean. You definitely need to post pics of your SB13 Ultra sitting on it!
Hopefully, the foam you used is some sort of super-dense acoustic foam. Even so... be sure to keep a close eye on it for several days. When I first got my little SB12, I also built an isolation stand for it. In my case, what I ended up with was two layers of 2"-thick acoustic foam sandwiched in between three 12"x12" pieces of 3/8"-thick polished black granite.
But initially, I tried using just a single-layer sandwich, with a 12"x12"x3" block of "similar" foam, which was slightly less dense than the acoustic foam. The SB12 sat on that overnight -- with its grill attached -- and the next morning, while I was sitting at my desk, next to the sub... it fell forward, onto the floor!
Apparently, the steel grills on these SVS sealed subs add a very
significant amount of weight to the front of the subs. Enough so, that in less than twelve hours, it had compressed the front edge of the non-acoustic foam enough to cause the sub to pitch over, forward. Fortunately, since its "fall" was really only a gentle "roll" onto the floor, the SB12 wasn't harmed at all.
Thankfully, I haven't had that problem at all with the dual-layered acoustic-foamed isolator (it's been in place for 18 months now)... but I also leave the SB12's grill off.
The whole reason I'm pointing this out, of course, is because an SB12 only weighs about 35 pounds... and your SB13U weighs 92!
Keep us posted about your results!