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Re: Help with a noisy recording

Subject: Re: Help with a noisy recording
From: "Rob Danielson" danielson_audio
Date: Mon Jan 4, 2010 2:42 pm ((PST))
At 9:58 PM +0100 1/4/10, Philipp Schr=F6ter wrote:
>Hello all,
>Could anyone of you explain why this recording is such noisy? Where does t=
>permanent hissing sound come from? I just used a rode nt4 into an olympus
>ls10 and am not happy with the current results. Which options are there to
>reduce all that? An external mic preamp? Recommendations?
>thanks a lot for any hint
>Philipp Schr=F6ter

Hi Phillip--
I see in the list archive that you reported lack
of satisfaction with your NT-4 several months
back and never got an answer.  Sorry about that.

First off, Rode made some 3.5mm cables for the
NT-4 with a -12dB "Pad" built-in that reduces the
mic's output. This pad should be by-passed or
removed. Here are the steps about how to
"by-pass" the pad if your cable proves to have
one: Not all of the
NT-4 cables do; Rode stopped including the pad in
the cable at some point. Removing it will lessen
the noise in your recordings.

I hear a "crusty static" in the left channel of
your sample that could be a bad
connection/connector but the right channel "hiss"
sounds more like self-noise, pre noise or low

If you discover that your cable does _not_ have a
pad, then could you make another test for us?
Start inside with a mic that has been at room
temperature for 8 hours and make sure the battery
in it is brand new. In a "quiet" room, set the
record gain near the maximum and stand quietly.
Start the recording and let it roll for 5 seconds
to record just the quiet room tone, jiggle/twist
the 3.5mm mic jack for a few seconds and pause
quietly for 5 secs. Repeat this jiggle-quiet
pause process two more times. With the recorder
still running, go outside and stand quietly for
10 seconds. Make sure the mp3 you post is encoded
at 192kbs or higher.  Hopefully, we can discern
the source of the problems(s) more reliably for
you. Rob D.


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