Just a quick note to say that although I am a quiet observer incapable
of contributing, I really enjoy reading the entire progress on this
project as it parallels my recording ambitions.
I really look forward to its outcomes.
A mini white paper would be great !!!
Many Thanks
Rally
--- In Rob Danielson <> wrote:
>
> At 6:07 PM +0000 2/6/08, tk7859 wrote:
> >--- In
>
><naturerecordists%40yahoogroups.com>
> >"tk7859" <g0sbw@> wrote:
> >
> >> But first I need to finish an idea I experimented with today. Using
> >> bits and bobs from my debris box I came up with an arrangement for
> >> varying the output from the forward facing triplet capsules without
> >> altering the output from the focal point triplets. This can be done
> >> by means of a controller on the handle of the reflector. It will be
> >> possible to smoothly change the wide stage parabolic into a normal
> >> parabolic while remaining focussed on the subject and continuing to
> >> record.
> >
> >Hello All
> >
> >I've been away from home (unexpected visit to North Wales)for six days
> >so this is the first opportunity to report back on the above. I have
> >completed the controller (potentiometer)
> >
>
><http://ad2004.hku.nl/naturesound/TomR/Wide%20Stage%20Parabolic/Variable%20ParaJeck.JPG>http://ad2004.hku.nl/naturesound/TomR/Wide%20Stage%20Parabolic/Variable%20ParaJeck.JPG
> >
> >and have tested it with the parajeck outside. The results are
> >disappointing. There does not seem to be a big difference in stereo
> >effect when the forward facing capsules have their output reduced.
>
> Hi Tom-- I may be confused. In this test, are you are comparing:
>
> (A) The focal point capsules + the side-facing front capsules ->
> (B) just the the focal point capsules?
>
> If so, didn't we already tested this in your clock sweep test and
> found the difference to be significant?
>
>
>
> >Here is a snippet of the test. This has been edited to remove the
> >sound of operating the potentiometer. As a result the "wide spaced"
> >segments begin with me introducing them and end at the point where I
> >introduce the "parabolic only" segments.
> >
>
><http://ad2004.hku.nl/naturesound/TomR/Wide%20Stage%20Parabolic/001-WS%20V_P%20edit%20mp3.mp3>http://ad2004.hku.nl/naturesound/TomR/Wide%20Stage%20Parabolic/001-WS%20V_P%20edit%20mp3.mp3
>
>
> I agree, in this test, there's not much localization difference in
> content> 1000Hz like the fountain and your whispers.
>
> The (A) focal point capsules + the side-facing front capsules seem
> to have more bottom end than (B) just the the focal point capsules.
> There is also less high-end and more Hi-HZ noise in (A).
>
> I think I am hearing some low Hz modulation in (A) that I did not
> notice before. This could be stem from the increased Lo Hz content in
> this range outside compared to indoors,.. Could it be that your mixer
> circuit has changed-eliminated the improved stereo field we tested
> before somehow?
>
> >
> >It might be that the reflector, on its own, has a reasonable stereo
> >effect due to the large dividing disc on which the "focal point" omni
> >capsules are mounted and/or the attenuation of the front, outrigger
> >capsules is not enough.
>
> There is considerable tonal change already so it might not be only a
> question of the amount of attenuation in the (forward-mounted)
> side-directed mics.
>
> I suspect the additional low hz response is important in the
> creation/impression of a wider stereo image.
>
> > To investigate this theory I am in the
> >process of building a Mk II parabar which has "head spaced thin plates
> >similar to Curt's rigs" as mentioned in Robs earlier post on this
> >subject. The large centre divider will also be dispensed with and the
> >the two focal point triplets will be mounted side by side without a
> >divider. A small variation of the potentiometer idea will also allow
> >the attenuation of the focal point capsules at the same time as the
> >barrier capsules' output is increased. Some more experimentation with
> >the value of the potentiometer is also possible at a later stage.
> >
> >Hopefully a working sample will be available early next week.
> >
> >Cheers, Tom Robinson
> >
> >
>
>
> --
>
>
>
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