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Re: Hi-MD(RH10) spinning noise when recording with EM23

Subject: Re: Hi-MD(RH10) spinning noise when recording with EM23
From: Rob Danielson <>
Date: Wed, 14 Dec 2005 13:05:16 -0600
I found that leather is very efficient material for absorbing the Hi 
frequency writing sound and I get none of the HiMD noise on my 
recordings in very quiet places placing it in a small leather pouch 
or camera bag.  Its a battery saving feature I understand.  My Sharp 
MD recorders make writing sounds too.

Perhaps my record level setting practice is unusual in that I set it 
by experience not unlike a photographer bracketing exposure for a 
given lighting situation.  The dynamic range created by the species 
expected in a natural setting are reasonably predictable. In most 
cases I go with a setting close to -12 dB for the background 
ambience.  Spatial depth is important to me and I don't mind 
over-modulating jets and the occasional finch that decides the branch 
next to the mic is a great perch. Other recordists go with something 
closer to -20 to 25dB for the background ambience to ensure that all 
calls are preserved with some loss of spatial resolution. Rob D.



At 12:45 AM +0900 12/15/05, Mark R. wrote:
>Hi Po-Jen,
>
>
>
>I have the RH10 and experience the same problem. My work around it has been
>to place it in inside a thick spongy MD case as well as in my pockets.
>
>
>
>So it is not just your unit. I too would rather look at my levels while
>recording certain things. I really like so many things about the unit, but
>the spin noise and the tiny record buttons are not on that list.
>
>
>
>Sounds like a silly idea and may not work at all, but what about a thick
>clear plastic case or bag and holding the remote outside the bag. This may
>only muffle that noise and won't look pretty.
>
>
>
>Wish I could have given a better suggestion.
>
>
>
>Best of Luck,
>
>
>
>Mark R.
>
>
>
>
>
>
>On 12/14/05, Po-Jen Chiang <> wrote:
>>
>>  I recently purchased a Sony MZ-RH10 Hi-MD. When testing it with Klas'
>>  EM23 mics, the RH10's constant spinning noise occurring every few
>>  seconds was picked up by the microphones into the recordings. The mics
>>  are about 3 feet from the recorder. Recording level is 20-23. The noise
>>  is so obvious. I expect that even I put the recorder in my pocket, the
>>  noise will still be picked up by sensitive mics such as EM23 and WL183.
>>  Furthermore, I need to look at the screen to monitor recording levels. I
>>  won't put it in my pocket most of the time. Given these spinning noises,
>>  I almost think that it is useless for quite soundscape recording. For my
>>  applications, the mics won't be more than 5 feet from the recorder. The
>>  spinning noise will be recorded. I have no such problem with my Sharp
>>  DR7. DR7 is quiet during recording. Any one has such issues? Or is my
>>  unit a fault one? I wonder why the noise did not occur in Rob's NH900
>>  recording test with NT1a. Thanks a lot for the help.
>>
>>  Po-Jen
>>
>>
>>
>>
>>  "Microphones are not ears,
>>  Loudspeakers are not birds,
>>  A listening room is not nature."
>>  Klas Strandberg
>>
>>
>>
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>
>
>[Non-text portions of this message have been removed]
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>


-- 
Rob Danielson
Film Department
University of Wisconsin-Milwaukee


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