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 ->=20
> 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=20
> 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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