Bass drum head help
Apologies if this has already been asked, I have searched the forum and I can't find the answer.
I recently have discovered an odd sound coming from my bass drum, I recently reheaded the batter head it for recording with an Evans Emad2. Along with this I cut a 5 inch hole in my 24" bass drum.
The drum has started to make a short metallic tone at the end of every hit. A bit like the same sound you get when kicking one of those cheap balloon-like plastic footballs (soccer).
I'm convinced the sound is coming from the reso head as the metallic noise only started after I cut the hole in the head (a pain when recording). I have muted the batter side and taken all tension off the reso side and hit the reso side and the noise still occurs.
I've got a Gretsch renown and the reso head is the normal coated Gretsch head that comes as standard with the kit.
Any help would be greatly appreciated