Crown PZM-10 Application Manual page 16

Fig. 30 – PZM 2.5
PZM-2.5
This model provides about 10 dB of forward gain at mid
frequencies compared to a PZM on the floor. The assem-
bly is placed on a large horizontal surface such as a stage
floor.
An 18"tall unit works well for speech pickup of drama,
musicals, and opera; cello, string bass, and kick drum.
F =160 Hz for 12"tall model. Polar pattern (12" model):
-6
See Figs. 28 and 29.
Fig. 28 – 12" tall PZM-2.5: horizontal-plane polar response.
Fig. 29 – 12" tall PZM-2.5: vertical plane polar response.
PZM-3
This model has a tighter polar pattern than the
PZM-2.5, so it can be used to isolate soloists. Again, the
assembly is placed on a large horizontal surface such as
a stage floor.
F (two 1' square panels on floor) =94 Hz.
–12
Random Energy Efficiency =–9 dB. The assembly has
9 dB less reverb pickup than an omnidirectional micro-
phone in open space at the same distance.
PZM Pyramid
This model can be made of three or four sides. It
emphasizes mid frequencies and is recommended only
for speech. Its highly directional pattern makes it useful
for long-distance pickup of quarterback calls. Pyramids
also have been hung over stages for pickup of rear-stage
dialog.
Since a plexiglass pyramid can be quite heavy, you may
want to make it out of sheet metal.
PZM Dish
The PZM Dish has an uneven response on-axis, but is
useful for its excellent directionality at mid-to-high fre-
quencies. Dishes have been used over orchestral sections
for isolation, and for long-reach speech applications.
14
Fig. 31 – PZM 3
Fig. 32 – PZM Pyramid
Fig. 35 – PZM dish.