Das Ding sieht ja ganz schön martialisch aus:
Ob das was bringt und wie es wohl klingt?
Fein- das war ein Reim... 
http://www.wembleydrumcentre.c…ce-Enhancer-Select-Colour
"Drumport Drum Resonance Enhancer (Select Size & Colour)
Using an advanced mathematical algorithm in the construction and shape of the flared ported horn, the drumport © is designed to regenerate the sonic and subsonic waves that emanate from the bass drum batter head, resulting in a thicker, fuller, drum sound. This is then dispersed by the flared horn to create a bass drum sound that can be heard over a wider area.
The drumport unit is as easy to fit as a normal drum head, and is fitted in place of the front resonant head, using the standard fittings, no specialist tools are needed. This makes it easily portable to try on different bass drums, 5 minutes and you're ready to go.
Launched at the London Drum Show 2011 (and sold to some internationally reputed drummers!), it is already finding favour with drummers of all ages, in Rock, Blues, Screamo, and Punk bands.
Now available for 20" & 22" diameter bass drums
Available colours....
Black, White, Carbon, Clear, Silver & Yellow.!
