Hi Curt,
I'd run then from a battery in a three wire configuration for best
resuls. The sensitivity can be controlled via a resistor on the source (pin 3/4
black lead) to shield with 9V via a yet to be determined resistor for the drain
(red lead) or better still internally solder a (precision) surface mount
resistor inside if theres room. - Perhaps the best method is to use Shure's own
preamplifier if considering phantom power. One issue is the drain resistor
noise and too low a source-ground resistance may cause excessive current in the
capsule.
Im not sure what you refer to as "stable" since even with the D50's low voltage
they were fine - I even have a recording of the blimp falling down in the wind
a few times, excessive shock.
For pip and the D50 I simply joined the black lead to the shield and soldered
those to the 3.5mm plugs ground and took the signal (red) wire direct to either
the left or right channel.
The monte gordo beach recording used two in a rode blimp as detailed in the
blog entry.
Kind Regards,
-MIke.
--- In Curt Olson <> wrote:
>
> Thank you for posting the nice sample, John.
>
> After some serious comparison studies with my AT3032s and AT4022s
> earlier this summer, I'm beginning to strongly prefer the trusty old
> WL-183s almost anywhere that doesn't require ultimate low noise specs,
> which I'm also beginning to realize is almost everywhere if you're
> careful.
>
> Question for you, Mike: You mentioned somewhere a while back that the
> Primo 172 capsules showed an increase in sensitivity with higher PIP
> voltages (like from a 9v battery box vs the 3v PIP from the Sony D50.
> I don't know how to make those measurements, but my experience seemed
> to bear that out; they seemed much more stable. So my question is...
> do you know if this is also true with the 183/391s? Anything to be
> gained by running these Shure capsules off a 9v battery box?
>
> Thanks in advance,
>
> Curt
>
>
> Mike Rooke wrote:
>
> > They are rather good, I blogged about the blimp boundary setup here:-
> > http://www.urlme.net/blog/?p=1733
> >
> > Ive also used two of the capsules inside silicone ears fitting to
> > the same
> > blimp. -tree not required.
> >
> > http://www.urlme.net/blog/?p=1754
> >
> > The pinna accept the shure capsules or primo - I also investigated
> > dynamic mics modified with pinna, the ear amplification was present
> > but the low end suffered too much due to occlusion of the mics rear
> > ports - not much use in the field compared to the unmodified dynamic.
> >
> > more on the latter comment later Ron...
> >
> > -M
> >
> >
> >
> > --- In "John Carroll"
> > <carrolljohnl@> wrote:
> >>
> >> Just a quick addition to the previous post, these mics (Shure MX391/
> >> O)
> >> work fine on the approximately 3V PIP supplied by the Sony D50. The
> >> original connectors were removed and both mics were wired directly
> >> to a
> >> 3.5mm stereo plug. The published specs are confusing. When I first
> >> read the specs I thought they required phantom power, but the mics
> >> alone
> >> (without the pre-amp that they are normally used with) work well on
> >> PIP.
> >> Thanks to John Hartog for setting me straight on this point. -jc
> >>
> >> --- In "John Carroll"
> >> <carrolljohnl@> wrote:
> >>>
> >>> For those interested in the Shure MX391/O mics, here is a
> >>> recording of
> >> an evening frog chorus I made last night. As Mike said, the MX391's
> >> are well balanced and they're easy to modify for PIP.
> >>>
> >>> Coupled with a Sony D50, a strap, a paper clip (to hang the
> >>> recorder)
> >> and some velcro, they make a nice, very portable rig for "tree ears"
> >> type recording (pic on SoundCloud).
> >>>
> >>> http://soundcloud.com/dismalhiker/aug-13-11-frog-chorus-ouachita-
> >>> pond
> >>>
> >>> John
>
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