2. Re: R-44 issue
"Philip Tyler" macmang4125
Thu Jun 21, 2012 8:47 pm ((PDT))
This may or may not help, I have a Sound Devices MixPre and when used with =
Audio Technica 3032 microphones it can end up almost 'motor boating'. Using=
LF cut on the microphone or MixPre itself cures this problem. On the sound=
devices web site they acknowledge this and suggest the LF cut as the way a=
round the problem. It can also help using the 15 volt phantom setting as we=
It was explained to me that the majority of microphones phantom power requi=
rements are constant current, variable voltage. But those mics which offer =
a range of operating voltages tend to be constant voltage, variable current=
(?) and these can stress the power supply. Which is certainly what happens=
in the MixPre case and is cured by applying bass cut or helped by using th=
e lower voltage setting.
There was a page on the sound devices site listing those microphones which =
caused problems, but I can't find the link to it.
I don't know if that helps you or not?
There was a thread I started about the AT3032 / MixPre problem some time ag=
From: robin_parmar_sound <>
Sent: Friday, 22 June 2012, 3:49
Subject: [Nature Recordists] Re: R-44 issue
> I connected sets of DPA4060 mics & when testing with these there is an au=
dible fluttering in low frequencies when connected to the R-44. Also some k=
ind of electronic signal generated by the recorder is audible.
According to my notes the DPA 4060 functions best at 48 =B14V but can run o=
n as low as 10V and draws around 0.5 mA. I would assume the recorder can at=
least provide that much times two. So if the recorder has the same symptom=
s with only two mics connected we need to look elsewhere for the culprit.
I would not be surprised if it was some strange grounding issue, perhaps re=
lated to how the shield of the socket and cable converter make (or fail to =
make) contact. I am hardly an expert but recall reading something similar s=
ome years back, relating to the DAD6001BC.
-- Robin Parmar
The University of NSW School of Computer and Engineering
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