The wedge has been abandoned, as the image was too narrow. This clip
was recorded with boundary-mounted 183s in a modified head-like array
(capsules about 6" apart with boundary planes at 45 degrees to each
other). I set it out on a dry bird bath about 10 feet from the back of
the house, angled upward. The slap came off the large 2-story back wall
of the place. The two discharges were actually a couple minutes apart
and crossfaded together. Wind was picking up, rattling the leaves to
the right. And yes, the bird. The rain came in torrents soon after.
Curt Olson
Rob Danielson wrote:
> re:
>> http://www.trackseventeen.com/media/tsp/x050809-thunder.mp3
>
> Very Fun. Are there a couple of surfaces to the right with the first
> discharge? Seems very short for slap-back echo within the cloud
> itself, unless it was _really_ close. The second discharge seems more
> like echo within the clouds. Terrific relief and movement-- Recorded
> with your wedge? Two cardinals emerging from the illusion of one, the
> back-up warning closure. :-)!
>
> I guess we know what we could test for now to pin it down to the 183's
> or HiMD or both. Rob D.
>
> At 8:58 PM -0600 1/24/06, Curt Olson wrote:
>> Me:
>>
>>>> Since I was able to duplicate the problem from the line input,
>>
>> Rob D:
>>
>>> "Line"input Sorry !:-[ With and 183 or another mic -> pre-> line->
>>> HiMD?
>>
>> Both. My definitive test was (if I remember right): 183 > ART Phantom
>> II > Lexicon PCM 91 (for some gain and ADC) > ProTools > Waves L2
>> hardware box (for DAC) > Hi-MD line in. This caused the Hi-MD to
>> bottom
>> out exactly the same as 183 > Hi-MD mic in w/ PIP. High-pass filtering
>> in ProTools of around 6db/octave beginning at 100 hz or so eliminated
>> the problem.
>>
>> And it's not just the 183s. Last week I ran a quick test with: AT3032
>> >
>> ART Phantom II > Hi-MD mic. It also bottomed out, but not as bad as
>> the
>> 183s. Switching in the low-cut filter on the 3032s seemed to eliminate
>> the problem -- or at least reduce it greatly.
>>
>>>> I suspect the weak link to be either the final line driver or the
>>>> ADC
>>>> (ADC seems the more likely culprit to me).
>>>
>>> I should try to reproduce this on my HiMD's with sine tones. When
>>> you
>>> posted this result, I was on the lookout for it. On three, 90 minute
>>> recordings I made last summer of loud, low, Hz thunder rumbles ->=A0
>>> NT1A's -> RollsPB224 -> NH-900 HiMD@ rec level "7 -13" ("hi sens"),
>>> none overloaded or showed the odd waveform. NT1A-s have a big bump=A0
>>> under 30Hz. Rob D.
>>
>> This is interesting! Last summer I recorded a couple wonderful thunder
>> claps almost directly overhead. Set-up was: 183 stereo array > Hi-MD
>> mic in w/ PIP. Nice and clean, with no bottoming out. There must be
>> something unique about the sound of thunder...
>>
>> http://www.trackseventeen.com/media/tsp/x050809-thunder.mp3
>>
>> Curt Olson
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