Yes. I have used the BDR MK. IV cones under a pair of psb Stratus Gold loudspeakers to very good effect. I just stuck them underneath (3 per speaker) and let the weight of the speaker keep them in place.
I used a Vibrapod sandwich as a bass under my speakers and then used DH cones underneath the sandwich. I was using PSB speakers in a concrete loft. Pretty amazing improvement. It was the only thing that really got the boomy bas under control. tightened things up nicley, but alas my room sucked so...
The speakers were on plush carpet on top of pad on top of concrete. With the BDR Mk. IV cones between speaker and carpet, sound became more focused and clarity increased, especially noticeable on vocal diction (could understand the words more easily). Also, cymbals sounded more realistic and less smeared. Bass had a deeper, tighter foundation.
While I have no experience with your setup or decoupling the speakers from the floor, I do have a lot of experience with bolts/nuts that loosen. I would find what is referred to as a nylock assembly. Most people have seen the nylock nuts but not the bolts. For those of you that aren't familiar with this type of fastener, it has nylon intergral with the thread and really holds even if you don't tighten the bolt or nut. Most large cities have a fastener specialty outlet. I would recommend taking one of your bolts with you to such a store and buying enough to replace the bolts you are now using.
My hotrod would simply vibrate apart without these wonderful products.
Lugnut and Bob, thanks both are good ideas. I think I have some blue Locktite and I might give that a try first.
I would still like to hear from others who have played with different ways of decoupling speakers. Townshend Audio makes a Seismic Sink loudspeaker platform which I would love to try. The smallest one of three models is $900 a pair. So I won't be doing it any time soon.
I guess Locktite is worth a try but it is designed to hold when the fasteners are torqued to spec. It's not glue. That's why I believe the Nylock product comes closest to your needs. They will resist backing out from vibration based on your description of not tightening to spec. Good luck.
Lugnut, another good point. Do you supose that a Home Depot would carry the Nylock bolts? I don't live in a big city and anything remotly exotic is hard to find in this locality. Perhaps an auto parts store, I don't know of any Hot Rod shops around here. Anyone out there know the thread spec for the Vandy's stands? The instructions for the stands makes no mention of it. I was able to get the right thread last time by taking one of the old bolts with me for a match. I suppose I could get the thread spec the same way at a hardware and then keep looking for the correct Nylock bolts. If needed to order them from a specialty supplier at least then I would know what to get.
Bob,no, I am NOT the recent Powerball lotto winner!
I am having second thoughts about the pods under the main speakers. They seem to solve some problems and cause some new ones. I need to experiment further when I have some time. They seem to allow for a more dynamic persentation but now I am hearing a boom problem that I can't seem to work out or explain.
I figured out the problem. When I put the pods under the cabinet I screwed up the amount of tilt. I tried them tilted further forward thinking that was what I needed to do. Wrong! I leaned them back a bit until the boom went away and everything came back into focus. The spacial info came back and I still have the improved dynamics. Anyone with Vandy 2's needs to be careful with the proper tilt angle. I also found out that the screws on the back plates needed to be tightened slightly as I tracked down an odd buzz to them. Tweeking can get confusing sometimes!