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Re: unbalanced inputs to the 722

Subject: Re: unbalanced inputs to the 722
From: "Derek Holzer" derekatumaticdotnl
Date: Wed Jul 5, 2006 9:47 pm (PDT)
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

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.


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 :::
---Oblique Strategy # 177:
"What is the reality of the situation?"

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