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#1682429 - 06/26/05 08:43 AM Variable Impedance Control
jbr
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Registered: 07/23/01
Posts: 201
Loc: London, ON, Canada

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Curious as to the pros & cons of such a control and it's effect on the sound/signal etc.

For example:
The Grace 101 has a fixed mic-input impedance of 1600 ohms, whereas the Summit 2BA-221 has a variable mic-input impedance from 100 to 10k ohms. The RODE K2 also has a variable impedance control.

The two mics I use: Shure KSM44's output impedance is 150 ohms and RODE NTK is 200 ohms.

Also, looking in the 2BA-221 pdf manual, it states: "The loading impedance should be about 4 times the microphone output impedance." And "If you are in doubt on how to set the Mic Loading control, set it fully clockwise to the 10k ohm position."

Could someone explain those?

As an aside, the 2BA-221 manual includes a Microphone Impedance Chart listing for many mics.

Thanks as always,
Jim

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#1682430 - 06/26/05 11:51 AM Re: Variable Impedance Control
Matt.Hepworth
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Registered: 03/13/01
Posts: 2972
Loc: Riverdale, UT

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Well, you can simply set the load to whatever load is desired. Originally the idea was to help match vintage mics, but in real world usage, your sound will vary quite a bit depending on impedance selection. So, use it as a tone control, essentially.
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#1682431 - 06/26/05 12:54 PM Re: Variable Impedance Control
paully
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Registered: 05/25/04
Posts: 1057
Loc: Northern New Jersey

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Quote:
Originally posted by jbr:
Also, looking in the 2BA-221 pdf manual, it states: "The loading impedance should be about 4 times the microphone output impedance." And "If you are in doubt on how to set the Mic Loading control, set it fully clockwise to the 10k ohm position."

Thanks as always,
Jim
>>>>>>>>>>>>>>

Opt for the higher input impedance. Far be it from me to argue with these guys, but 4:1 is really low. Rule of thumb is 10:1 or higher. As stated above, if variable, choose what sounds best while giving optimal gain.
Good luck. Paul \:\)
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