what if you put too much lead shot in your speaker

I filled a pair of VR4jr's with lead and it made a big improvement.

If you use the correct design geometry and material choices then speaker vibration can be channeled away and not be retaimed in the cabinet..like when using lead shot..I think Larry worked with Albert at one time..Tom

Yes I did.
The geometry and the resonant peaks of the cabinet are all important. I can only say that, violins and violas don't use lead to dampen them. Pianos don't use anything to 'deaden' them either. The natural order of 'musical' instruments is to allow for vibrations to occur at their normal occurances. If My own speaker, which I designed, sounded better without a deadening lead shot, what would that tell you? The Sistrum points, ( I don't even know what they are called) helped, then something other that what you or I think, is at work here.
I am not trying to change your mind, just broaden your horizon, just as mine was.
Larry

I'm sure there are other things to try, but in answer to your question, I found that the recommended lead shot in my VR2s made the speakers sound much better. Does lead make them sound best? I don't know, but they sound much better with the lead for very little cost or effort.

If a speaker manufacturer designs his speakers to sound better with lead shot, then what's the problem. One of the obvious benefits of this is lower shipping cost and less chance of shipping damage.

I remember an article in TAS many years ago. They were interviewing James C about either Alien or Terminator. The interviewer was going on and on about how James used the wrong film stock, film speed, and aspect ratio. James finally told they guy that he was the director, he made the decisions to obtain a certain feel to the film, and if he didn't like it he could go piss up a rope (not in those exact words). I lost all respect for TAS that day, and have not purchased an issue since.