[Elecraft] CM-500 Response (was: Heil HC-4, HC-5)

[Joe Subich, W4TV]

Bob, 

> For my CM500 I have my K3's EQ set to:
> 
> Band       +/-
> 1            0
> 2            0
> 3           -6
> 4           -6
> 5          -10
> 6            0
> 7           +4
> 8           +8
 
Except for bands 1 and 2, the effect of your EQ is very similar 
to my "DX" settings.   

         DX/    
Band   contest    Ragchew
  50     -16       -16 
 100     -16       -16 
 200      -6        -3
 400       0         0
 800      -3        -3 
1600      +6        +3
2400     +10        +5
3200     +12        +6  

These settings provide a shelving (low cut) filter at about 
150 Hz (a typical hum/rumble filter).  The "ragchew" setting 
is a 3 dB/octave slope and the DX/contest setting is a 6 dB 
per octave slope.  The -3dB "dip" at 800 Hz could be a bit 
deeper and reduces background noise in the "interformat gap" 
- the area, typically between 600 and 1200 Hz, where the human 
voice has no energy. 

Both versions get "great audio" reports ... but as I have said, 
it should not be necessary to be so aggressive with the EQ.  My 
early training in the recording studio was to use the right mic 
for the job and use as little equalization as possible. 

73, 

   ... Joe, W4TV 
 




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bob Naumann
> Sent: Friday, April 02, 2010 7:31 AM
> To: 'Elecraft List'
> Subject: Re: [Elecraft] CM-500 Response (was: Heil HC-4, HC-5)
> 
> 
> For my CM500 I have my K3's EQ set to:
> 
> Band       +/-
> 1            0
> 2            0
> 3           -6
> 4           -6
> 5          -10
> 6            0
> 7           +4
> 8           +8
> 
> Aside from the mic being a little "hot" (no close-talking 
> allowed) the TX audio sounds great. It sounds good to me in 
> the monitor and I have gotten positive compliments on it over 
> the air on those very rare times I actually get on SSB.
> 
> 73,
> 
> Bob W5OV
> 
> P.S. The DVR is really a good deal. The recorded messages 
> sound identical to live transmissions - perfect!
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
> Sent: Friday, April 02, 2010 12:21 AM
> To: Elecraft List
> Subject: Re: [Elecraft] CM-500 Response (was: Heil HC-4, HC-5)
> 
> On Thu, 1 Apr 2010 21:43:05 -0400, Joe Subich, W4TV wrote:
> 
> >My CM-500 is very "muddy" with only the bottom two bands of
> >TX EQ cut to the maximum.  I also need to reduce 200 Hz and 
> >boost 1600/2400/3200 Hz. 
> 
> I suspect there's something wrong with the CM500 you have. 
> 
> 73,
> 
> Jim K9YC
> 
> 
> 
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