I don't believe the impedance mismatch is the source of your problems.
Most audio electronics will have a much higher specified input impedance
than the corresponding output of the source device.
There's some quick reading here:
http://hyperphysics.phy-astr.gsu.edu/hbase/audio/imped.html#c1 with a
link at the bottom for some more specifically about microphones.
It's about the desired result (fidelity) vs the "perfect circuit"
I can't say why the mic you bought sounds like crap. You ought to be
able to purchase about any small shotgun or other directional mic, along
with a hot-shoe based shock mount and, if need be, an adapter cable from
XLR to mini jack and get better sound than the built-in.
Microphones do provide varying output voltages so some need more input
amplification than others, but given the market these things are
shooting for, I'd bet they are all about the same.
Come to think of it, I wonder if there's a setting in the camera for
audio level adjustment or for stereo vs mono external mic.
You wouldn't have an9other camera (or anything else) handy to test the
mic with?
Cory
On 12/22/2011 10:49 AM, Dario Bonazza wrote:
Joseph McAllister wrote:
Dario, I purchased the RODE VideoMic that is show in all the images from
Pentax re: video recording. It works great, but the formed mic muffler
that covers it from the factory is only good for indoor use. You have to
spend a few bucks more for a proper wind attenuating cover, the ones that
look like a shaggy dogs tail. They just slip over the existing
attenuator,
and are tied in place with a little string noose.
Thanks JoMac. I understand everybody suggest that microphone. However, I
have two doubts:
1 - I'd like a directional mic for recording at a concert, hopefully
getting
music instead of public noise. The Rode SVM is stereo, but not directional.
2 - So far, I got the best results with a cheapo-cheapo (10 bucks or
less) PC microphone I happen to own. That gives a better sound level
than either the K-5 built-in mic or the shotgun SG-108 microphone.
Is the 200 ohm output of the SG-108 shotgun mic responsible for
the barely audible sound level I got? I had this suspect since the K-5
specs say that input impedance of the mic port is 2.2 Kohm. If so, why
should that Rode SVM mic any better, as it also gives 200 ohm output like
the SG-108?
Dario
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
