Usher CP-63XX owners, have you added Lead Shot?

toxic when touched, and the chance that residue from the shot inself can enter the air for decades. not worth the risk to you or family.

Interesting thread! I am considering the purchase of 200lbs of #8 lead shot in 25lb bags to use as ballast for the back of my Myesound Stands on the Maggies. The thought was to keep them in the bags and lay them in a custom made box to fit on the back of the stands. The only common element denser (i.e. heavier) than lead shot is lead itself (blocks, sheets, etc.). Permanently sealing the box with the lead inside shouldn't be a problem as I see it...You?

Use steel shot. The shot cleans up the cabinet resonance in the all important midbass area. And no toxic impact on the world or your family.

that's a great thought Emilg1955 - Thank you - it didn't occur to me.

I had both the 6371 and 81's. Its important to break them in for a time before using shot or sand in them. Give them a good 300 hrs and afterwards I used steel shot in the cavities. Start with 10 lbs in each speaker. You can add in 2 lb increments and listen for the changes. I started with near 30lbs in them and that amount took too much mid-bass away.The dealer was using "50" lbs and said to "load 'em up"! DONT do that! Trust me... I ended up with only ~13 lbs in each, which was just right. Deep tight locked in bass..Use the shot judiciously as a little will make noticable changes. The speakers change too much during break in to get a true reading on the bass, so putting in shot before this will end up costing you time and sweat putting in and taking out shot..(very messy and those Ushers are quite heavy!)

Good luck, and enjoy them..They are great sounding speakers!