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Re: unbalanced inputs to the 722

Subject: Re: unbalanced inputs to the 722
From: "Anton Woldhek" getvergetver2
Date: Thu Jul 6, 2006 3:07 am (PDT)
Ey Derek,

Got the same with piezo's homemade stuff. Havent checke with other
unbalanced mikes and im off to india now. Btw, join
www.sounddevicessupport.com lots and lots of 7-series users there!

Anton 

> -----Oorspronkelijk bericht-----
> Van:  
>  Namens Derek Holzer
> Verzonden: Thursday, July 06, 2006 6:42 AM
> Aan: 
> Onderwerp: Re: [Nature Recordists] unbalanced inputs to the 722
> 
> Yes, I experienced the same thing plugging my piezo contacts 
> direct into the 722. However, the Core Sound Binaurals did 
> not have the same hiss when plugged into the 722. Of course, 
> these two mics provide are quite different, and what was the 
> same for me was the electromagnetic interference.
> 
> In your case, the signal to noise ratio would improve greatly 
> by using some kind of impedance converter such as a DI box.
> 
> It's funny, however, because when I plug all the same gear 
> into an RME QuadMic preamp, I don't have the unbalanced/high 
> impedance problems at all. I wonder if RME has built their 
> preamp with some kind of impedance-sensing circuit which 
> switches depending on input.
> 
> Could other 722 owners with unbalanced/high impedance mics do 
> me a favor and plug it all together in a VERY quiet setting, 
> turn the gain up to 
> +60 or so, hit record and listen for the harddrive writing? It is a
> regular signal occurring about every 10 seconds. Please tell 
> me which mic you test with it and what your results are.
> 
> best,
> d.
> 
> Andrew Skeoch wrote:
> > Hi Derek,
> > 
> > This may or may not relate to a specific problem I've 
> noticed with my 
> > 722. I have tried a Sony single-point stereo mic, an ECM959 
> with 6.5mm 
> > jacks, and found plugging it directly into the 722 (no phantom, and 
> > using a pair of 6.5 to XLR converters) results in a 
> significant grainy 
> > hiss. Using a mic preamp (6.5 to XLR converts on pre input, 
> XLRs pre 
> > to 722) eliminates the hiss and the mic then has a smooth, 
> fine-grain 
> > noise floor. I wonder whether this additional grainy hiss 
> is a result 
> > of either a high impedance mic or unbalanced input?
> 
> 
> --
> derek holzer ::: http://www.umatic.nl
> ---Oblique Strategy # 177:
> "What is the reality of the situation?"
> 
> 
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>  
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