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CHAPTER 3: 750-LFC GROUNDSTACKS AND CARDIOID ARRAYS
750-LFC CARDIOID ARRAYS
The 750-LFC can be configured in cardioid arrays to reduce undesirable low frequency leakage behind the loudspeakers. The
loudspeaker's linearity ensures that cardioid patterns behave accurately even at very high levels. Cardioid arrays are achieved
by placing three units coplanar to each other (in either a groundstacked or flown array) with one unit facing the opposite
direction (Figure 5). Apply signal processing to the rear-facing unit, polarity opposite of the front-facing units and relative to
the front-facing units, an additional delay of 2.9 ms, which yields output that cancels output from the other loudspeakers
normally present behind the units.
Figure 5: 750-LFC Cardioid Groundstack (Without Rigging)
750-LFCs need not be equipped with the MRK-750 rigging kit for groundstacked cardioid configura-
NOTE:
tions of up to three cabinets.
750-LFC cardioid arrays can also be flown from the MG-MINA/LINA/750-LFC multipurpose grid. For more
NOTE:
information, see Chapter 5, "MG-MINA/LINA/750-LFC Grid."
To achieve an accurate cardioid pattern, you must use Meyer Sound's MAPP prediction software. Use
NOTE:
MAPP to calculate the appropriate ratio of forward- to rear-facing loudspeakers, as well as the processor set-
tings for polarity. A myriad of possible cardioid and directional configurations can be calculated and predicted with
MAPP. For more information, contact Meyer Sound Technical Support.
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