Filling speaker Stands?


I have a modest system. Continually look for ways to improve it's performance even to a slight degree. I have read many posts about improvements than can be achieved by filling the hollow spaces of some speaker stands with some type of material....sand, kitty litter, lead shot, and some others. Here are the stands I have......
https://www.sanus.com/en_US/products/speaker-stands/sf26/ 
These stands are of metal construction. There are 2 upright support tubes which are approx. 2" diameter. The stands sit on a carpet floor with spikes. On the top plates are a layer of Sorbothane and PSB Imagine B speakers sit on top of that. The 2 metal supports are attached to the base and top plate with just threaded holes about 1/4 " diameter. Pouring some type of dampening  material would definitely require a funnel.
The reason I ask this question is that, when I thump on each upright post, it rings for several seconds. A dampening fill would minimize this but would filling those posts really benefit the speaker performance to even a small degree given my modest setup? I don't know. Probably, few have experimented with this type of scenario.Thanks for any advice.



jrpnde
Thought I would revive this thread with the weirdest experience I've had in this hobby. I had Atacama Nexus stands which were filled to the brim with Atabites. I experimented with 50% filled and then 75% filled which sounded better before settling on 100% filled because my bookshelf speakers are quite heavy (Dynaudio Contour 20). The Nexus stands were pretty wobbly so my thinking was that the more weight the better since it would be more stable. To be honest there was no difference in sound quality between 75% and 100% filled. I just filled it because there were spare atabites and I didn't want the stand to wobble. I enjoyed this combination (C20 on Nexus stands) for a little under a year, the sound was open, the bass was deep and rich.

Fast forward to 5 days ago and I copped a new pair Dynaudio Stand 6 stands as there was a discount to good to pass up with the local AD. Upon transferring the atabites from the Nexus stands to the new Dyn Stand 6 I realized that there weren't enough atabites because it was filled until halfway or 50% only and not the recommended 75%. The Dyn Stand 6 is more robust compared to the Atacama Nexus (its also 2 times the price which is why I didn't buy it in the first place (doh!)) and has a damping material sandwiched in between top and bottom plates and my first impressions were that it sounded okay at 50% filled but not as open sounding as the Atacama Nexus was with atabites filled to the brim.

So what was my solution? Buy more atabites! So I bought a tub and filled it up to the recommended 75% filled amount. Turned up the juice and my jaw dropped because it sounded horrible! Life was sucked out of the music, anxiety and worry washed over and I thought to myself what have I done? 

Did some quick research on overdamped stands and true enough someone from a Singapore hifi forum experienced the same thing with his Dyn stands and atabites. He ended up removing all of his atabites. 

The following day I removed half of the atabites and left about 1/4 filled in each stand and lo and behold, the C20's are singing again. They sound better than they ever were with the Nexus + 100% atabites filled combination.

The moral of this long and winding post is: what is recommended does not always translate to best results (granted Dynaudio website recommends filling up the stands to 75% with dry quartz sand and not atabites) and secondly, sometimes less is more. I hope this can help someone not make the same mistake as I did as he too will have a tub of inert silver pellets hidden under his couch.      
I posted on this very subject earlier today, describing how easy it is to be lulled into the state of mind that absorption or damping is always good. And how difficult or impossible it is to change course once one has started down that path. It’s what Acoustic Revive, a high end Japanese company, refers to in their literature as “over-dumping.” Pity the man who believed more is better and didn’t pay attention to the potential for over-dumping.
Sound Anchors damp their metal-tube stands with a foam-like substance, I believe. Great stands imo.