|The Sanken COS-11 lavalier mic and accessories. Notice the length of the capsule.|
Sound mixers gush about the great sound of COS-11 microphones. It seems no matter how it is oriented on wardrobe, or how it may be buried, it still sounds bright and natural. It is easy to hide. The cable is very soft and lays flat on the body's curves.
|Tram TR50 Lav microphones contain Zero G 1506 hearing aid capsules|
Sanken COS-11's are said to have the diaphragm (the membrane that vibrates in reaction to sound) run lengthways down the capsule case. The membrane can therefore be larger than the typical hearing aid membrane, which is as tiny as practical, and round. Some describe the COS-11 as a ribbon mic in a lavalier. True?
Well, I wanted to see if the sales pitch of the COS-11 is true. Does it have a large membrane, or just another hearing aid capsule in a long case?
I decided to cut the case open laterally with a Dremel Moto-Tool.
This cut presents a nice cross section of the mic, showing the screen and interior capsule. Onward...
Here's the leaf spring in place on the capsule. This would certainly insure a good electrical connection between the capsule and the case.
Hence the "sound", and perhaps other engineering of which I'm totally unaware...
Update- here is the metal base with the membrane removed. No FET, but a channel thru which sound enters from the top and is exposed to the length of the diaphragm. The FET must be on the plastic half of the sandwich.
-by Pete Verrando Please visit my home pages at www.txsound.com