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9. Re: R-44 issue

Subject: 9. Re: R-44 issue
From: "Jez" tempjez
Date: Fri Jun 22, 2012 12:47 am ((PDT))
thanks, but these issues are, for want of a better way of putting it, sound=
 pollution to the signal - as in additional sounds entering the sound & the=
se can't be overcome with LF filters etc.

If anyone would like to hear a short mp3 or wav of the fluttering & electro=
nic sound I can send them it.


--- In  Philip Tyler <> wro=
> This may or may not help, I have a Sound Devices MixPre and when used wit=
h Audio Technica 3032 microphones it can end up almost 'motor boating'. Usi=
ng LF cut on the microphone or MixPre itself cures this problem. On the sou=
nd devices web site they acknowledge this and suggest the LF cut as the way=
 around the problem. It can also help using the 15 volt phantom setting as =
> It was explained to me that the majority of microphones phantom power req=
uirements are constant current, variable voltage. But those mics which offe=
r a range of operating voltages tend to be constant voltage, variable curre=
nt (?) and these can stress the power supply. Which is certainly what happe=
ns in the MixPre case and is cured by applying bass cut or helped by using =
the lower voltage setting.
> There was a page on the sound devices site listing those microphones whic=
h 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 =
ago here.
> Phil
> ________________________________
>  From: robin_parmar_sound <>
> To: 
> Sent: Friday, 22 June 2012, 3:49
> Subject: [Nature Recordists] Re: R-44 issue
> =C2=A0
> Jez wrote:
> > I connected sets of DPA4060 mics & when testing with these there is an =
audible fluttering in low frequencies when connected to the R-44. Also some=
 kind of electronic signal generated by the recorder is audible.
> According to my notes the DPA 4060 functions best at 48 =C2=B14V but can =
run on as low as 10V and draws around 0.5 mA. I would assume the recorder c=
an at least provide that much times two. So if the recorder has the same sy=
mptoms with only two mics connected we need to look elsewhere for the culpr=
> I would not be surprised if it was some strange grounding issue, perhaps =
related to how the shield of the socket and cable converter make (or fail t=
o make) contact. I am hardly an expert but recall reading something similar=
 some years back, relating to the DAD6001BC.
> Odd indeed.
> -- Robin Parmar

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