It may be wrong.
Today while opening up a Beyer M88N(C) a plastic tube almost the length of the mic body was found inside a larger diameter tube touching the metal part of mic body.
The small tube feeds the larger one. So it seems it is an acoustic tranmission line of double the length of mic body.
By reading the AKG patent on D12 (see previous posts) could this tube arrangement be an impedance match of the back side of the capsule so that the acoustic wave sees an infinite length tube.
This is a relevant AKG patent:
https://worldwide.espacenet.com/publicationDetails/mosaics?CC=GB&NR=786111A&KC=A&FT=D&ND=3&date=19571113&DB=EPODOC&locale=en_EP
Inside the smaller? tube were found hundreds of twisted threads, acoustic resistance for damping?
No comments:
Post a Comment