Rich:
I think a human's ability to determine the direction of low frequency sounds
is much better than the recording industry leads one to believe. For
instance, I've never had any trouble locating a drumming Ruffed Grouse at 60
Hz or thereabouts, nor do I have trouble determining the direction of
distant thunder, much of which is below 60 Hz.
The only reason that everything below 100-120 Hz is routed to the subwoofer
in many surround sound systems is because the front and rear speakers are
small and do not have good low frequency output. Mike Sokol, a surround
expert, prefers to use speakers that are responsive down to around 50 Hz. He
then routes only the less-than-50Hz material to his sub. This is because he
likes to localize the low frequency sounds.
My modified SASS equipped with MKH 20 mikes has a good low end, at least to
my ear, and the directionality of low sounds remains intact in my
recordings, at least to my ear.
Here is an example of thunder. Listen to the low bass and tell me whether or
not it sounds like it's coming from the proper direction as determined from
the higher frequency components of the thunder:
http://www.naturesound.com/mp3/thunder.mp3
Lang
> This is that same scene as the 16x speedup, right?
Nope different.
I should have pulled a different sound to test this idea, was a bad
choice for a bunch of reasons. Biggest is I should have used a flat
land area for this test.
I will try again, much more controlled, with matched mics, in a flat
space with intersecting highways in the distance.
I like "decorrelated" sound but I will agree not this way.
Rich
>
> I listend a few times through Tannoy passive Reveals off of
> Mac sound-out, then switched to headphones through iMic --
> 1st Senn HD 280pro (closed), then HD 600s (open). I prefer
> the straight binaural with all three listening modes, and
> I prefer the HD 600s for "being there".
>
> Let me suggest a few conjectures for why I don't like the
> wide baseline bass:
>
> It's decorrelated from the corresponding HF parts because
> of the separation from the close-spaced pair. That means
> you can hear the low end in each ear seperately from the
> other ear and the high parts.
>
> mp3 compression aritfacts.
>
> Rich, can you estimate the path of the jet with respect to
> the acoustic baseline? I take it that it did not pass directly
> overhead, nor was it parallel to the line of the mics. I assume
> the widespread mics were on the same axis as the binaural pair.
>
> Also, was the binaural pair and the wide pair the same model mics?
>
> Thanks for doing the recording, processing and sharing -- I'm
> blowing all my recording time on mundane things like music.
> I like that skeeter or whatever off to the right just at the end.
>
> -- Mike
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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