This subject came up in another thread on end-pins. I ran across the first two URLs back in May 2004, but never pursued it in a thread. They show a device which is basically a Helmholtz resonator to help provide some degree of acoustic amplification for a double bass.
http://home.m08.itscom.net/iga/music_e.html http://home.m08.itscom.net/iga/music_j.html http://www.patentstorm.us/patents/5920020-fulltext.html http://www.patentstorm.us/inventors/...p-1024710.html
The last two URLs are for a patent issued for a device which appears to describe the device on the Japanese websites. However, the patent was issued in 1999 to Reimund Korupp in Heidelberg, Germany, and the first URL states the device was invented in 2002.
Is anyone using this kind of a sound augmenting device and/or have any information about the practicality of the design, i.e. does it actually provide usable acoustic amplification for a double bass?
Lloyd Howard
