| Sheet bracing, perhaps?
I wouldn't assume that simply adding sheet bracing will 'darken' a trumpet's sound the way you desire. In general, it will probably tighten the slots, it might give it more resistance and it might reduce the high frequency harmonics of the trumpet's sound. It could also improve or lesson the projection of the horn, depending on how its done.
You can add these on any horn if you have the money. It will require that there be raw brass to solder the braces onto.
Since Kanstul has this on some models already, sure they can do this and would do it if you pay them. I doubt they will guarentee how the horn plays/sounds afterward. IMO, sheet bracing is a tricky science that requires a lot of experimenting to achieve the desired result.
Greg
PS - If you want a C trumpet with a very dark tone you could always try an oversized heavy mouthpiece like a Bach 1 Megatone. Of course, the magatone simply cuts out the upper overtones, it doesn't enhance the lower ones.
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