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
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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