Putting weights on speakers?

Oh yeah...that sounds like a brilliant idea kozka. 

Bring back the Bright Star Little Rock!!

I now have put 53 pounds on each speaker.
They are OB on the mids  and tweeters. And have a back enclosure for the woofers. So I am able to just put weight on the woofers however I notice increased clarity on all frequencies. Especially tightening up the lower ones. And the imaging is much better. I would highly recommend weights on speakers. For WAF Rougefitness.com sells pairs of black vest plate weights for $56. I bought and am using 4 pair, 4 on each speaker.
But increase from 33 pounds (8.75 lbs each plate) to 53 lbs is a great increase in clarity. I hear no down side to the extra weight. The additional 20 pounds come from 20 lb ankle weights. They spoil the WAF but since they are in back hope the wife does not notice!

Up date,
I took 20 lbs off each speaker leaving 33 lbs on each. The bass is more complex and still tightened. Works better with less weight.
The extra 20 lbs deadened the bass too much!

Anything that touches the cabinets will change the sound.  If you want a more elegant solution try HRS damping plates.  www.avisolation.com