At 7:37 PM -0800 11/8/05, Dan Dugan wrote:
Eric has noted a bump below 30Hz on AT's chart that tested out for
him and I concur from my field results. Don't you think that most
reasonably "flat" mics will show a steady rise from 100Hz down in
quiet fairly open places like this? What stood out for me in the
183/3032 raven comparison is the soft, distorted, airy-ness ~250-450
Hz in the 183's.* It may be that _some_ of this is the ATRAC
algorithm busy at work on other parts of the spectrum like the drips
etc, but I also think most of it is just how the 183's handle these
frequencies-- the 183's self noise masking the sound reflections in
this range.
*The distortion I'm describing is at the extreme sides. It is
coincidentally in the same register as the breath fundamental, but
lower in volume. The breath is in the center, of course. Rob D.
>
> I also noticed that there's a rumble at the
>bottom end of the 3032/722 recording that the 183/MD combo didn't
>pick up. On a Spectrafoo analyzer the ambience starts rising below
>100 Hz and keeps on rising all the way down to 6 Hz. I suspect this
>was the ocean, but it could be self-noise of the mics.
>-Dan Dugan
>
>
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