Hi Paul--
Something could be astray. Assuming your recording was made in a
rural location with only distant low frequency sound sources, the
response curve on your 3202's is quite different from Rich's AT3202
pair in a rural location with minimum low frequency sounds present. I
took a part from your clip with no filter and matched playback level
(RMS) with Rich's 3203's. His pair is on the left and comes first in
the sound clip:
https://pantherfile.uwm.edu/type/public/media/RichAT3202_PaulAT3202.jpg
https://pantherfile.uwm.edu/type/public/media/RichAT3202_PaulAT3203.wav
Your pair not only emphasizes lows and lower mids, it could be
lacking high frequencies.
My first thought is a possible impedance or component mis-match. Do
I recall that you use an MP2? What components are in your recording
rig and what are all of the settings you are using? Have I
characterized the location correctly? Could there be wind or other
pink noise-like sound source present where you recorded? With this
info we might be able to provide better guesses, but you may have to
compare the your AT3202's with other mics in the same spot at the
same time to get to the bottom of this. Rob D.
= = = = =
At 6:06 PM +1100 3/2/08, Paul Jacobson wrote:
>Ok I guess I should post an illustration of what I'm getting.
>
>The whroo frogs recording which I posted to the list, and to which
>John referred to, was made with LF cut on the HDP2 switched on. I
>initially started recording with LF Cut off and had the recorder
>running when I flipped the switch. There isn't much happening in the
>recording apart from a bit of rustling, but it clearly illustrates
>the kind of LF energy or "growl" that I'm trying eliminate.
>
><http://www.urbanbirder.com.au/audio/play/13>http://www.urbanbirder.com.au/audio/play/13
>
>I'm trying to identify what is contributing to that LF energy. My
>suspicion is that resonances from the tripod are being transmitted
>into the rig, but looking at sonograms of Walt's comparative
>recordings seemed to suggest that the might mic be a contributing
>factor as well, but that could very well be a misinterpretation of
>the recordings. I certainly wasn't condemning the AT3032's to the
>junk heap - in fact I'm about to order another to use in a Telinga
>Universal rig.
>
>I'm sure it's been stated many times, that these rigs are experimental
>
>The main reason I am looking at this is that I want to tweak/rebuild
>the rig before I head up to the Alice Springs area in May for a
>couple of weeks. The top priority is incorporating a shock mounting,
>which I hope will eliminated much of the LF rumble/growl.
>
>cheers
>Paul
>
>On 02/03/2008, at 4:38 PM, Rob Danielson wrote:
>
>> Paul,
>> Sorry to hear your AT3032's are not performing up to your
>> expectations. I second John's suggestion. If you are certain the
>> abnormal response or artifact lies in the lower registers, it would
>> help to select a sound from (or record a test in) a quiet location
>> away from low frequency sound sources. It common for locations to
>> have lots of energy in this part of the spectrum. A wooden barrier
>> can lift the upper mid-range and brighten-up the sound a bit, but it
>> typically does not emphasize the lows. Of course, if you have other
>> mics you can make recordings with in the same location/conditions,
>> they'll will provide additional reference. Rob D.
>
>
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