I have brand-new Evans MX1 heads on a Yamaha MB8320U frame. Each side of the drum is identical in form and function.
However, one side's head sounds wonderful. The other side, however, has extremely pronounced overtones. I've checked my own tuning method, I've used a drum dial, I've done a few other things... but I can't seem to get to the root cause.
I don't have any sound impact/muffling strips handy.