Which PZM mic?

Archived from groups: rec.audio.pro (More info?)

Federico <plokmichael@tiscali.it> wrote:
>What about Crown Pzm 30-GBP?
>Did you try that?

No, what is it? It's not on the Crown web site or on any of my
catalogues. Is it sold for Great Britain Pounds?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

Federico <plokmichael@tiscali.it> wrote:
>Sorry,
>it was Crown PZM 30-GPB
>take a look at it here...
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7339733839&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1
>I can't find it in Crown website... I know that americans have their name
>for nearly everything.... Is this maybe a PZM 30-D?

That is from the early 1980s and don't know which model it is. I know they
had a bunch of variants with different equalization and different noise
floors, but that's one I never came across back then. I would tend to avoid
any of those old mikes.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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Agent 86 wrote:

> I know the patented PZM configuration has to do with capsule positioning
> relative to the plate. But (all else being equal) is there any real
> advantage to a "Genuine" PZM over other boundary mic designs?

None whatsoever. The cantilever with a capsule facing down
has _nothing_ over a surface mounted omni capsule facing up.
The extra mechanism serves only to disturb the HF and
muddy it. The hype is just that.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein

Archived from groups: rec.audio.pro (More info?)

Agent 86 <maxwellsmart@control.gov> wrote:
>
>> If you want any sort of boundary mike, that depends on your budget.
>> Schoeps makes a boundary mike that is very fine, but it's not cheap.
>> Beyerdynamic makes one that is better than the Crown but not as good as
>> the Schoeps, and is priced in-between. Audio-Technica also makes some,
>> though I have never used them.
>
>I know the patented PZM configuration has to do with capsule positioning
>relative to the plate. But (all else being equal) is there any real
>advantage to a "Genuine" PZM over other boundary mic designs?

This is something of a religious issue. Some people will claim that the
PZM-style capsule positioning is a method of getting a deliberate top end
rise to compensate for the poor high frequency response of the capsules
that Crown uses. Some other folks will claim that using a capsule with
no resonant chamber in front and relying on the boundary for the high
frequency rise is better than putting a resonant chamber in front to bring
the high end up (like most back-electrets do).

Personally I'm staying out of it, but I will say that the Schoeps boundary
mike sounds better than any of the Crowns, and it does not use the PZM
patent positioning. On the other hand, it's also designed around a capsule
with a very light diaphragm and naturally good high frequency response.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

In article <YmrGe.17833$2U1.1170907@news3.tin.it>, "Federico"
<plokmichael@tiscali.it> wrote:

> I'm looking for a pair of PZM mics to use as OH or room mics for a rock
> drumkit.
> I think I'll tape them on the ceiling.....
> I used them +or- 5 years ago in a small studio and now I'd like to have a
> pair of mine.
> I took a look at Crown website and there are plenty of models...
> I'd like a XLR connector and 48v phantom but I've seen many relying on
> batteries....
>
> Any suggestion on brand and model?

I have a pair of Shure SM91A boundary mics that I like a lot. Great for
quick setup when you just want to record a rehearsal or jam session; also
good as room mics. However Shure has discontinued this model, or changed
the model number - I can't recall the new model name at the moment. They
also have a "Beta 91" (or something like that) that looks the same but is
marketed as a bass drum mic.

--
Jedd Haas - Artist
http://www.gallerytungsten.com
http://www.antijazz.com
http://www.epsno.com

Archived from groups: rec.audio.pro (More info?)

"Richard Crowley" <rcrowley@xpr7t.net> wrote in message
news:11enmj4q7uhoq49@corp.supernews.com...
> "John L Rice" wrote ...
>> The Radio Shack PZM has a square ( or nearly square ) metal back plate
>> with the battery and electronics box separated and half way down to
>> cable. http://www.uneeda-audio.com/pzm/pzm1.jpg
>>
>> FYI - Rick Chinn's site is my favorite for the Radio Shack PZM mods, he
>> even sells a kit for it. http://www.uneeda-audio.com/pzm/index.htm Rick
>> is a great guy and really knowledgeable. Too bad he doesn't hang out
>> here! check out his whole site, lots of useful information.
>
> None of those referenced Radio Shack models are available
> anymore, are they? Not that you can find in the catalog or
> in any of the storefronts.
>
> Completely agree that Rick's website is a good resource.

Right. The Radio Shack ones haven't been sold new for many years. Ebay is
usually full of used ones though. This seller has both original RS PZMs and
a Crown SoundGrabber for auction. Good pictures of both :

http://cgi.ebay.com/ws/eBayISAPI.d [...] 7340035527

http://cgi.ebay.com/ws/eBayISAPI.d [...] 7340035590

--
John L Rice
Drummer@ImJohn.com

Archived from groups: rec.audio.pro (More info?)

normanstrong@comcast.net wrote:
>>I know the patented PZM configuration has to do with capsule positioning
>>relative to the plate. But (all else being equal) is there any real
>>advantage to a "Genuine" PZM over other boundary mic designs?
>
>
> The Radio Shack and Crown PZM mikes face the boundary and are spaced only
> about 1/16" away. This has the advantage of adding 6 db to the output.
> Another way of looking at it is that the mike noise level will be 6db lower
> for the same output. With the very small capsules used in this design, that
> 6db is a big and very useful improvement.

This is only a function of being at the boundry and not due
to facing it. A surface mounted capsule will give the same
6 dB gain without introducing multiple paths around the
cantilevered capsule or diffraction due to it.

The "pressure zone" is the surface itself where velocity is
zero and pressure is doubled because the incident and
reflected wave are exactly at the same point and thus in
pressure phase and exactly out of velocity phase. The gap
these devices introduce has nothing to do with it.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein