The electret element in question is 400 ohms imp & it was plugged into the
input of a 600 ohm imp computer sound card. Recording my speech i noticed
that it lacked "highs". I then replaced the above with a 2k ohm imp element
& there was a vast improvement. The improvement consisted of a higher freq
response & a dramatic increase in output (volume). What baffles me is, i
thought that by matching the mic & sound card with similar impedance that i
would get better efficiency? It appears that my computer sound card (600
ohm input ) works better with a 2k ohm mic than a 400 ohm mic! By the way
the sound card provided the power for both mics. Any comments concerning the
above would be appreciated.


Arfa Daily" wrote in message
...

"Spin" wrote in message
news:9SyEh.7663$Xe1.3030@trndny01...
I have a headset electret condenser mic that has a low frequency response.
Other than changing the element is there a means of getting a higher
frequency response?


Are you saying that the frequency response is poor, as in it is unable to
respond to high frequencies such as speech sibilants ? If so, that is very
unusual, as in general, the frequency response of an electret mic is very
good - certainly more than adequate for speech, and in most cases, good
enough for pretty much anything short of professional recording. A quick
look at the specifications of a few shows them to be good to at least
16kHz. Has the response always been poor ? Are you sure that the problem
is not something much more fundamental, such as the small hole where sound
gets into the mic, being stuffed up with fluff or other clag ? Or are you
maybe feeding it into an input with entirely the wrong sensitivity /
impedance ? Does the insert get it's supply from an internal battery, or
should it be fed with a phantom supply from the equipment that it's
plugged into ? If so, is the equipment providing such a supply ? Not quite
the easy question that you were supposing perhaps ... ??

Arfa