Pzm Boundaries - Crown PZM-10 Application Manual

PZMs and PCCs can be used for sound reinforcement
in many applications. These are described below.
Altar table:
• Place a PCC on the altar table as in Fig. 17. The PCC is
available in black or white.
Conferences, teleconferences, group
discussions, interviews:
See the Crown Microphone Application Guide for
Teleconferencing and Distance Learning.
Drama, theatre, musicals, opera
• Try one to three PCC-160s across the front edge of the
stage, about 1 foot from the edge of the stage (Fig. 18).
One or two PCCs are usually sufficient for small stages,
and they clearly pick up stage action for dressing-
room cues. Place two PCCs about 20 feet apart; place
three PCCs about 15 feet apart.
For maximum clarity and maximum gain before feed-
back, turn up only the microphone nearest the person
talking.
Show the performers and the custodian where the PCCs
are located so the PCCs are not kicked or mopped.
To reduce pickup of the pit orchestra, put a 2' x 2' piece
of 4" thick Sonex foam about 1" behind each PCC.
The excellent reach of the PCC provides clear pickup of
rear-stage action in most cases. But if you need extra re-
inforcement, place PZMs on the rear wall, on panels
overhead, on a table under a tablecloth, behind posts,
under eaves or scenery.
Fig. 17
Fig. 18
Courtroom proceedings:
• Place a PCC-170 or PCC-130 on the witness stand
and judge's bench.
Horns
• Tape a PZM on the music stand above the sheet music.
Grand piano:
• Tape one or two PZMs or PCCs to the underside
of the lid, about 8" horizontally from the hammers
(see Fig. 19). To reduce feedback, close the lid.
Upright piano:
• Tape two PZMs 3' apart on the wall, 3' up. Place the
piano frame 1" from the wall so that the PZMs pick
up the soundboard.
Drum set or percussion:
• Tape a PZM to the drummer's chest. Hang a PZM verti-
cally in the kick drum with the microphone side of the
plate aiming toward the beater.

PZM BOUNDARIES

You can greatly broaden your range of PZM® applica-
tions by mounting the PZMs on one or more boundaries.
A boundary is a stiff, nonabsorbent surface such as a
floor, table, or plexiglass panel. PZM boundaries are
usually constructed of clear acrylic plastic (plexiglass)
to make them less them less conspicuous, but any stiff,
sound-reflective material can be used.
By adding boundaries to a PZM, you can tailor the
microphone's frequency response and directional pat-
tern. Such flexibility makes the PZM one of the world's
most versatile microphones.
This section explains the theory, benefits and drawbacks
of single and multiple boundaries. Also covered are con-
struction methods for several types of PZM boundary
assemblies.
Credit is due Ken Wahrenbrock for his pioneering work
in multiple boundary experiments, and for many of the
boundary array suggestions in this section.
A PZM is designed to be mounted very near a boundary
to prevent acoustic phase cancellations. The boundaries
9
Fig. 19