This is a great approach for a great sounding acoustic drum. Unfortunately it does not work in most mic’d situations without a really good engineer and the type of music that can handle a ton of boom.Don't port the reso head. Don't use any dampening at all. I have a 1965 Ludwig 14 X 20 BD, & I only use a protective "FALAM" patch to protect the batter head at the impact point from the BD beater(hard felt, wood, hard plastic, just depends). No towels, pillows, junk in the drum. Batter head tuned lower than reso, and this old 20 " sounds like a cannon. Heads are regular Ludwig heads. The 20" reminds me of my 16X26 which is an unported, non dampened monster Low boom, plenty of volume or softness, and a lot of people ask me for help in getting their BDs(and other drums) to sound better.