## MIC PREAMP

Device/Module Wishlist

Original topic on PlanetZ: https://forums.scopeusers.com/viewtopic.php?t=17933

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Posted: Wed Jan 11, 2006 7:56 pm
by DJ Mosley
Hey, how about a Mic Preamp for vocals? Is there already one? I know Wolf made a Phono Preamp, so if that's possible, a Mic Preamp should be possible.

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Posted: Thu Jan 12, 2006 5:37 am
by alfonso
The problem with it is that the phono preamp is mainly an EQ thing, while the MIC signal has electrical differences with the line input that will bring to a lot of noise and poor signal that would be made even worst with a boost after the converters.
You need it before your line in connection, you've no alternatives sadly...sorry.

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Posted: Thu Jan 12, 2006 8:10 am
by alfonso

> On 2006-01-12 06:34, Shroomz wrote:
> The introduction of noise would depend on the mic's impedance surely?

I'm not an expert, but impedence mismatch causes a loss of the mic signal. It could be acceptable within a certain limit, but while mixers usually can be quite flexible in their inputs providing knobs for sensitivity adjusting, I'm not sure that an audiocard line input can be ok with it.
I't could maybe, but not at a professional quality level. I never tried though.

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Posted: Thu Jan 12, 2006 10:30 am
by Lima
I'm not sure if this link could be useful, but a check doesn't cost a thing...
https://forums.scopeusers.com/viewtopic ... 2&f=16
I've never found that dev, could anyone put it online somewhere or give me some info?
TNX

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Posted: Thu Jan 12, 2006 11:18 am
by astroman
well, if I remember this right my Pulsar One has the 'classical' NE5532 opamp input stage.
It's probably the same on the 2nd generation cards, but check it to be sure.
Wolf's phonoamp rises the input level as much as possible and it's not bad at all to sample a vinyl loop or something like that.
But that opamp isn't exactly what you'd like to have for more sophisticated applications.
As a micpre you'd be restricted to dynamic types as there's no phantom power for condensor mics - for shouting into an SM58 it should be OK, tho.
cheers, tom

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Posted: Tue Jan 17, 2006 4:14 pm
by jc70417

> On 2006-01-12 05:37, alfonso wrote:
> The problem with it is that the phono preamp is mainly an EQ thing, while the MIC signal has electrical differences with the line input that will bring to a lot of noise and poor signal that would be made even worst with a boost after the converters.
> You need it before your line in connection, you've no alternatives sadly...sorry.

Alfonso is right, I have tried using PhonoPreAmp with a Shure SM58, and the noise after the boost is unbearable.

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Posted: Wed Feb 01, 2006 6:33 am
by Immanuel
A phono preamp makes heavy equalisation. It boosts the bass and cuts the trebble. Vinyl records are cut with less bass, because they othervice only could contain few minutes of music. They are cut with excess trebble, because when trebble is reduced in the reproduction, surface noise is reduced too - it is a bit like with Dolby B and C for cassette tapes.