naturerecordists
[Top] [All Lists]

Re: Fostex FR-2LE ?

Subject: Re: Fostex FR-2LE ?
From: "Eric Benjamin" ericbenjamin2
Date: Tue May 13, 2014 12:42 pm ((PDT))
Raimund,

I'm trying to understand this problem. =C2=A0Are you saying that the microp=
hone is drawing power from the phantom supply in an unbalanced way, and pos=
sibly causing different amounts of noise from the phantom supply to show up=
 on the two legs of the (supposedly) balanced circuit? =C2=A0Or is it that =
the output impedance of the microphone is unbalanced in the two legs and th=
us causes the amount of noise in the two circuits to be unequal at the two =
inputs to the microphone preamp?

It had occurred to me some years ago that it would be very useful to see te=
sts of the output impedance of microphones, both the common mode part and t=
he differential part. =C2=A0It would show how well the system (microphone, =
cable, and preamp) do at rejecting noise from external sources.

Eric


From: " [naturerecordists]" <naturerecordists@=
yahoogroups.com>
To: 
Sent: Tuesday, May 13, 2014 1:55 AM
Subject: [Nature Recordists] Re: Fostex FR-2LE ?



=C2=A0
Hi H=C3=A5kan,

I agree with you that there is no reason to worry about that minor phantom =
power noise issue on the TASCAM DR-680.

The person who published that "problem" also contacted me privately and rep=
orted the details. He used a cheap Behringer B-5 microphone that obviously =
lacks a balanced output stage.

Some time ago we discussed here a similiar effect on the Roland R-44 (and R=
-26) in combination with an unblanced DPA phantom power adaptor. So, there =
are similiar effetcs in other recorders too.

Fortunately, all these phantom power related noise problems will go away as=
 soon as one uses a properly balanced microphone.

Regarding your note on the external preamps: I don't hink that you are miss=
ing anything here. There seems to be some kind of a placebo effect that mak=
e some folks believe that a preamp would improve the recordings even if the=
re is no objective poof for that...

Regards,
Raimund







<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU