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Re: Sony MD Microphone preamp... Design and settings...

Subject: Re: Sony MD Microphone preamp... Design and settings...
From: Klas Strandberg <>
Date: Sun, 09 Feb 2003 16:00:37 +0100
Evert wrote:

>  [own remark: In both cases this is done by letting the same signal
>  go thru the same opamp, but with 1 resistor more or less in the
>  circuit. So overdriving the opamp will happen at the same SPL no
>  matter the switch position.]

Hm...? The "1 resistor more or less" is the resistor setting the gain of the
op amp. The lower value (Ohms)- the higher op-amp gain, the lower headroom
and the more distortion you get when input goes high. Observe that such "too
much" never shows on the meter! 

Klas.


>- Models without a switch have a gain of roughly 25 times.
>
>I haven't seriously tested the difference between the hi and low 
>setting, I will do it next week. But what is the reccommended setting?
>
>I always thought it was best to record to about -6dB to -3dB. I try 
>having as little analog gain as possible, and having almost no 
>digital cutting (attenuation). 
>Because when you have a microphone preamp in a mixer (large studio 
>device type) it is common - recommended, I should say - to have the 
>fader at zero dB (no attenuation at the end of the chain), and have 
>the preamp setting with as little as pre-gain as possible (as little 
>gain as nessecary in the beginning of the chain)
>This instead of a high gain at the beginning together with a high 
>attenuation at the end of the chain because this way the hiss and 
>noise is way higher then the first mentioned approach...
>
>You might know that I always use the low gain setting of my MZR55 and 
>have the digital recording level almost always at 75% to 100%.
>
>Is this approach wrong? (judging from what I have read last week I 
>tend to think it is wrong, but why?)
>
>Should I use more analog gain and then digitally bring down the 
>recording level? Has anybody already tested this with results that 
>could be repeated by performing the same test based onm the test 
>procedures?
>
>Regards, Evert
>
>
>
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>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email: 
       



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