Hi Vicki,
I like your idea. As a variable, I think the height of the sweet spot for
recording must be related to the anticipated placement of the intended
listening audience - by evolution of vocal projection.
John Hartog
--- In vickipowys <> wrote:
>
> Curt and others,
>
> I found Curt's comments most interesting re the sweet spot for mic
> placement being 18-24" off the ground. Lyrebirds sing usually in the
> 1-4 kHz frequency band, and from a low mound of earth on the ground,
> and I guess that 18-24" would be about beak height for a singing
> lyrebird. I am thinking the lyrebirds are smart, and understand how
> sound transmits and is received.
>
> Curt, do you have any information on which frequencies of bird song
> sound 'sweeter'? i.e. what are the most used channels of sound for
> your local birds. 1-4 kHz, or higher?
>
> cheers,
>
> Vicki Powys
> Australia
>
>
> On 05/08/2009, at 5:11 AM, Curt Olson wrote:
>
> > Thanks Greg,
> >
> > I've experimented with ground effect quite a bit over the last year.
> > To my ear, the "fuller sound" you mention seems to become quite
> > noticeable at about 15" or so and increases rapidly to the point of
> > serious ugliness at ground level. But in the 18" to 24" range, there
> > seems to be a certain sweet clarity that seems to drop off ever so
> > slightly as the mic moves upward to about head height -- at least
> > that's what I've ovserved.
> >
> > I've never done any serious experiments with higher elevations like
> > Walt and Dave have done. Hmmm... yup, that's definitely another
> > element to look into.
> >
> > Curt Olson
> >
> > Greg Weddig wrote:
> >
> >> Curt,
> >> I would generally agree with you, though I don't have any evidence
> >> of such. Most of my ORTF recordings are done in that same range. I
> >> think the ground effect most likely provides a bit of a fuller
> >> sound, much like a PZM microphone would.
> >>
> >> Mostly I am trying to keep the mics out of the wind, and keeping
> >> them low I find, depending on the geography, helps shield them from
> >> nearby highway and city noise.
> >>
> >> --greg weddig
> >> http://gregweddig.net
> >> Paradise, CA
> >>
> >>
> >> --- In Curt Olson <cro@> wrote:
> >>
> >>> Ever the respectful contrarian, I've recently discovered -- much to
> >>> my surprise -- that the head-spaced barrier type mic rigs I'm
> >>> currently using seem to render a slightly cleaner image when I have
> >>> them in a "sweet spot" approximately 18" to 24" above the ground.
> >>> This improvement is very subtle, and might be peculiar to my
> >>> current rigs. I'm curious if anyone else has experienced the same
> >>> thing.
> >>>
> >>> Curt Olson
> >
> >
> > ------------------------------------
> >
> > "While a picture is worth a thousand words, a
> > sound is worth a thousand pictures." R. Murray Schafer via Bernie
> > Krause
> > Yahoo! Groups Links
> >
> >
> >
>
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