There are two ways to reduce ring:
- Increase tension
- Dampen the skin
The more you tighten the skin, the less ring you get. The down-side is twofold: the ring may not completely go away at the point where the skin is what you'd consider tight enough, so you may need to tune the drum to a pitch you'd rather not have it at. And, of course, higher tensions means shorter skin life.
If, once you are at the proper pitch, you still get some ringing, you can
apply electrical tape to reduce ringing. You can also experiment with applying short pieces of electrical tape to the underside of the skin. By varying the number and position of the pieces of tape, you may be able to reduce the ringing without over-dampening the skin.
If the interior of your drum is quite smooth, you may have to live with the ringing though...
Cheers,
Michi.