When it comes to microphones, you get into religious wars. I happen to like
doing "live" recording work with a stereo ribbon mike that has the capsules
basically "touching" vertically. (Open sound, natural sound field.)
A single point pickup results in a 'coherent' recording. The sound is in phase
at that one point in space
Add additional capsules, and you end up with multiple unknowns on 2 equations.
(the 3 point omni decca thing for example.) Simply using a pair of mikes in
front of a group gets the cleanest stereo recording.. or a single mike to get a
mono recording.
Same thing applies on broadcasting. (That is why they use noise gates to turn
off idle mikes...so that the pickup of the guy talking isn't added in and
cancel him out.)
KK4QDZ - Now with Extra Class Priv's, and a tiny KX3 to enjoy them!
From: Harry Yingst via Elecraft <elecraft@mailman.qth.net>
To: "j...@audiosystemsgroup.com" <j...@audiosystemsgroup.com>;
"elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Sent: Sunday, January 25, 2015 3:31 PM
Subject: Re: [Elecraft] My KX3 desk microphone project
Can you please provide a reference for this?
From: Jim Brown <j...@audiosystemsgroup.com>
To: elecraft@mailman.qth.net
Sent: Sunday, January 25, 2015 12:48 PM
Subject: Re: [Elecraft] My KX3 desk microphone project
On Sun,1/25/2015 5:20 AM, Gary - NC3Z wrote:
> In my opinion much, much better words should of been choose than
> "seriously misguided", they have connotations that one is an idiot.
> Seriously misguided would be trying to run a 12V device off 120V.
Why? If an idea is seriously misguided, saying so is entirely
appropriate. I did not expand on the advice because this is an email
reflector dedicated to Elecraft radios, not microphones.
There are (at least) three reasons why an array of microphones is a
really bad idea. First, really good sounding mics to work with our
radios are widely available cheap. Second, a microphone is an
electroacoustic device -- it collects sound at a point in space and
converts it to voltage. A microphone at a different point in space
collects different sound -- there is a difference in time between those
sounds, which results in a difference in phase. The difference in phase
results in peaks and dips in the frequency response, which in the audio
world is called comb filtering. Third, one mic loads another
electrically, degrading the performance of each.
Third, those of us working in pro audio learned a long time ago that one
mic feeding a single channel is always better than one for picking up a
single sound source like the human voice. Putting more of them in
parallel does not make them work better.
When you see two mics on either side of a podium, it's an indication
that whoever put them there didn't understand that. As the talker moves
side to side, the sound of his/her voice changes due to the
cancellation. Almost 40 years ago, I did a couple of big outdoor sound
reinforcement gigs for the President, and the White House sound
engineers DID understand that -- they studied at the same workshops that
I did. They had Shure build a special mic for them with three capsules
in it, each coming out on their own shielded twisted pair. Two went to
me, the second was for redundancy -- in case wiring for the first one
failed. Each went to a different input of my mix console. The third went
to them for their recording.
73, Jim K9YC
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