Theatre Design & Technology - Summer 1984 - 32

NEW
PRODUCTS
...............................................................
microphone clips are attached to opposite
sides of the panel for stereo recording. There
are also boundaries manufactured for use with
a lectern.
For further information, write the Customer
Services Department, Crown International,
1718 West Mishawaka Road, Elkharl./N 46517.

Crown's Pressure Zone Microphones
Crown International's Pressure Zone Microphones are designed to be used on surfaces such as tables, floors or walls. They have
a wide, smooth frequency response free of
phase cancellations, excellent clarity and
"reach" (clear pick-up of quiet distant sounds),
a hemispherical polar pattern and uncolored
off-axis.
The PZM-180, a general purpose microphone from the line, can be phantom powered
or battery powered. It requires no external
power-supply interface. Self-contained electronics adapt the unit for phantom powering, or
the microphone can operate for hundreds of
hours on its self-contained "N-cell" battery.
Connecting the microphone to a phantom
power supply disconnects the internal battery.
Like other Pressure Zone Microphones, the
PZM-180 utilizes the Pressure Recording Process T .1, in which a miniature condenser microphone capsule is arranged very close to a
sound-reflecting plate or boundary. The capsule is mounted in the "Pressure Zone" just
above the boundary. a region where sound
coming directly from the sound source combines in-phase with sound reflected off the
boundary. This eliminates phase interference
between direct and reflected waves for clearer,
more natural reproduction. An integral handle
allows the microphone to be hand-held, stand
mounted, or simply laid on any hard surface.
The output is balanced, low impedence, available at an integral XLR connector. This means
that the microphone can drive long microphone
cables without hum pick-up or high frequency
loss. In addition, the microphone. supplied with
a battery and a windscreen, is compatible with
all professional recording and reinforcement
equipment.
Crown has also introduced "boundarles"
or panels. which help solve problems of audience nOise. muddy acous ICS or feedback by
making the PZM directional. The Crown A240
Boundary is a transparent Plexiglas panel, two
feet square by '12" thick, to which a stand
mounted PZM can be attached. The boundary
extends the low-frequency response, increases
gain-before· feedback, and reduces pick-up of
leakage. audience noise and room acoustics.
It makes the microphone sensitive to sounds
approaching from the front of the panel. while
rejecting sounds from the rear, therefore, directional. It includes an adjustable adapter which
can mount to any standard microphone stand.
Holes in the panel permit it to be flown. Two
30

Theatre Design & Technology /

New 4" x 5" Patterns from the Great
American Market
The Great American Market now has patterns available in a new 4" x 5" format, for use
in all models of the company's Scene Machine
special effects projector. The forty available
patterns include many which the firm's design
staff had found not practical in the traditional
"circle of light" format. For further information.
request the catalog "Four by Five by the Great
American Pattern" from The Great American
Market. 826 North Cole Ave., Hollywood, CA
90038.

Bogen Announces New Microphones
Bogen Division, Lear Siegler announces a
new line of four performance microphones for
popular applications. The models range from a
tie-clip sub-miniature electret condenser microphone to a desk-top dynamic microphone.
Other dynamiC models are cardioid, supercardioid, omnidirectional, hand-held and lavaIier microphones. Their uses range from performance, recording and sound reinforcement
to paging, dispatching and mobile applications.
The MDO-710, an omnidirectional moving
coil dynamic microphone, is made for professional recording and broadcast studio use. Its

SITT /Sullllller 1984

distinctive nondirectional polar pattern gives
natural reproduction of reverb and room
sounds on distant pickups and no proximity effect when used close to a sound source. The
MDO-710's low-mass diaphragm and voicecoil assembly insure fidelity and sensitivity. A
600-ohm voice coil eliminates the need for a
matching transformer; providing a lightweight
(5 oz.) unit and distortion-free handling of high
volume levels. Its pressure-sensitive transducer gives flatter frequency response and
smooth, extended range. A die-cast, mattefinished housing encloses noise-reducing internal construction. Its protective carrying
case includes a 16 V2' cable assembly and a
stand adaptor.
The MSC-620, a professional, dynamic,
super-cardioid microphone, is designed for
close miking. It features extremely wide, uniform response curve, uniform cardioid polar
pattern and maximum rejection of extraneous
sound. This low- impedance microphone has a
frequency response of 50 to 17,000 Hz. It is
complete with an on/off switch and a built in
spherical windscreen. A stand adaptor and
16 V2' of cable are included.
The MIT-920, Bogen's SUbminiature electret condenser microphone, has wide-range
capability and high intelligibility. Measuring
0.8" in length and weighing 0.09 oz, it was
created for performers to clip to a tie or other
clothing. A permanently charged, five-microns
thin polymer diaphragm eliminates the need for
an external power supply. An internal FET buffer is powered by a small AA type battery. Low
current drain allows approximately 2,000 hours
of use with an average battery. The MIT-920's
battery case has a belt clip and built-in on/off
switCh. It is permanently attached to the microphone by a 28" integral cable. The microphone
also has a permanently attached cable with an
unterminated output for a choice of connectors
to match the amplifier in use. A clothing clip
and a removable foam windscreen are included.
Model MDL-920 is a machined-aluminum
lavalier microphone with matte finish. This dynamic, omnidirectional microphone offers exceptional sensitivity and frequency response.
A balanced, low-impedence microphone, it
weighs 5.5 oz. and can be hand-held or used
with its accompanying neck cord and clip.
In addition to the four performance microphones, the new series includs three types of
PA/paging microphones. For further information, write Bogen Division of Lear Siegler, Inc.,
P.O. Box 500, Paramus, NJ 07652

StarGate 323 from

rsa Major

Ursa Major announces the StarGate 323. a
stereo digital reverb for professional applications. It features eight room-simulations, including tiny chambers, fast-diffusing plates,
concert halls and huge echoing spaces. Tilese
rooms can be modified by front panel controls

Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1984