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

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!

Thanks for the info, I will get them up and running then decide. Any idea where to purchase the steel shot, if I decide to go that route?

The issue of lead shot being used in speaker stands has come up in the past quite frequently, and I agree with most that discourage the use of this material in domestic applications. In my opinion, it is not worthwhile to use something that has potential hazard. However small it might be, there is risk anyone can be affected, not only to toddlers or small kids. It's like keeping knives and sharp objects clear from infants. The only difference is knives are essential household utensils being used in the kitchen while lead is not. There is a choice of using other safer material. You would never know if there is leakage and lead dust(possibly from abrasion between the lead pellets) may leak out from the stands.

Also, I think there isn't any major differences between lead shot and steel shot, or sand material. I may be wrong, but I will leave it for lead shot users to comment.

Nordost wires used to have this "Lead Free-Protect Our Environment" label on their packaging, for those who might want to know.