Crown PZM-10 Application Manual page 18

FIg. 42 – 1560 with side boundaries.
1560 with Side Boundaries
This is a basic 1560 modified with two side boundaries
at 45 degrees on each side (Fig. 42). The side boundaries
provide additional discrimination of loudspeakers to
either side of the lectern.
L 2 Array
This multipurpose array (Fig. 43) was designed by
recording engineer Mike Lamm. Mike has used this
array extensively for overall stereo or surround pickup
of large musical ensembles.
Fig. 44 – Frequency response of L
120º between boundaries.
FIg. 43
array (with PZM-6D capsule).
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The hinged, sliding panels can be adjusted to obtain
almost any stereo pickup pattern. A complete descrip-
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tion of the L Array is in AES preprint 2025 (C-9),
"The Use of Boundary Layer Effect Microphones in
Traditional Stereo Miking Techniques, " presented at
the 75th Convention of the Audio Engineering Society,
October 1983. The frequency response is shown in
Figures 45 and 46.
Fig. 45 – Polar response of L
Fig. 46 – Polar response of L
L Floor Array
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Here's another stereo PZM array (Fig. 47) designed by
recording engineers Mike Lamm and John Lehmann.
It simulates the O.R.T.F. stereo mic technique. According
to one user, "You can take this array, set it down, and just
roll. You get a very close approximation of the real event."
Suspending the inverted array results in less bass and more
highs, while placing it on the floor reverses the balance.
When this array is used on a stage floor, the construction
shown in Fig. 48 is useful. It has decreased side pickup
and increased pattern overlap. The axes of the left and
right polar patterns may be at any desired angle, just so
the 120° boundary angle and 6.7-inch capsule spacing
are maintained.
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2 array, 120º between boundaries.
2 array, 120º between boundaries.