Posted by
Lu Romero - W4LT on
Oct 06, 2010; 2:36am
URL: http://elecraft.85.s1.nabble.com/SSB-transmit-audio-Where-s-the-punch-tp5600109p5605592.html
Jim:
Its very mildly cardioid then! :) This aint no shotgun, Jim!
I choose not to compensate for the boominess with EQ and not eat this mic
like an HC4 as it adds to the distortion I hear in the monitor and see on
the scope. I would rather run the mic gain a little hotter and put up with
the room tone than deal with the boominess electronically. I can always
gate the room tone. I have always tried not to "fix stuff in the mix" but
I'm severely crippled with a very poor operating environment for sound.
Then again, this is Ham Radio, not work!
And with 12 volt finals, I need all the signal cleanliness I can get :)
Of course, you are right, but I'm walking a fine line between distortion and
punch. I find the fatter foam windscreen from an Audio Technica Pro8HEx mic
helps me place the CM-500 capsule at just the right distance from my mouth
for me.
-lu-
Message: 27
Date: Tue, 05 Oct 2010 14:25:59 -0700
From: Jim Brown <
[hidden email]>
Subject: Re: [Elecraft] SSB transmit audio - Where's the punch?
To:
[hidden email]
Message-ID: <
[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 10/5/2010 2:09 PM, Lu Romero wrote:
> First, the DX4 is a "close talking" microphone. You have to
> almost eat it for it to work right. The CM-500'ds Electret
> capsule has a pronounced proximity effect. You HAVE to keep
> it AT LEAST an inch from your mouth or it sounds mushy and
> bassy. This, combined with its omnidirectional response and
> the need to run mic gain relatively high to command good
> peak to average ratios from the K3 processor, cause "much"
> room noise (not a lot really, but Im picky) to find its way
> to the transmitter.
The CM500 is NOT an omni-directional mic -- you've noted that it has
proximity effect, and that's BECAUSE it is a cardioid (directional) mic.
As to the proximity effect -- you can compensate that the same way that
virtually ALL vocal mics are compensated within the mic -- with
additional low end rolloff.
73, Jim K9YC
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