9
LD-1A with CQ and 650-P
Activating the Lo Cut filter on the LD-1A for the Mid-Hi
output also eliminates the low frequency rise caused
by the overlap between the CQ and 650-P. Although a
typical CQ : 650-P ratio is 2:1, separate Sub and Mid-Hi
level controls on the LD-1A allow the ratio to vary
while maintaining control of the spectral balance of
the system.
650-P
CQ-1 or
CQ-2
LD-1A
Line Driver
Sub
Mid-hi
Set the CQ and 650-P to the same polarity.
LD-1A with Flown MSL-4, DS-2P, and CQ;
650-P on the Floor
This example shows the LD-1A integrating a complete
system of speakers appropriate for a large venue.
Although channels 1, 3, and 5 constitute half of a
complete system, channels 2, 4, and 6 can be used
with identical connections to create the other half of
the system. The MSL-4 mid-hi, DS-2P mid-bass, and
CQ down-fill speakers are flown; the 650-P subwoofers
are on the floor.
The Mid-Hi and CH 3 outputs drive the inner three
and outer two speakers, respectively, of the MSL-4
array. These two outputs apply appropriate levels for
speakers directed at audience locations at different
distances from the main system. The diagram shows the
additional mid-hi output created by connecting the
CH 1 Loop to the CH 3 input. Using a Y-connection at
the CH 1 input, as shown for the down-fills, accomplishes
the same signal routing.
The Lo Cut and Array EQ switches for the Mid-Hi and
CH 3 outputs should be in. The Lo Cut filter eliminates
the rise caused by the overlap between the MSL-4 and
DS-2P/650-P systems. The Array EQ filter minimizes
the low-mid rise caused by the MSL-4 array.
The DS-2 and Sub outputs drive the DS-2P and 650-P
systems with the DS-2 & Crossover switch in. Set the
MSL-4 and DS-2P to the same polarity. The polarity of
the 650-P depends on the displacement from the flown
system.
CH 5 controls the CQ down-fill system. Since the main
system is normally set to a higher volume than the
down-fill system to project farther into the venue, the
main system is audible in the down-fill’s coverage
area. To insure that the speakers combine properly in
the overlapping coverage area:
• Set the CQ to the opposite polarity to the MSL-4
and DS-2P to phase align the mid-hi frequencies and
minimize the MSL-4’s low frequency down-lobe.
• Use the CH 5 Lo Cut filter to eliminate the low
frequency rise caused by the overlap with the
650-P/DS-2P systems.
• Delay the down-fill to compensate for the
propagation delay between the down-fill and
main systems in the intersecting coverage area.
(This is highly recommended, but not required.)
We recommend using the Meyer SIM System II Sound
Analyzer and CP-10 Parametric Equalizer to optimize this
configuration.
650-P Subwoofers
CQ Down-fills
DS-2P Mid-Bass
MSL-4 Mid-Hi
Input Mid-Hi
Output
DS-2
Output
Loop
Sub
Output
Input Output
LD-1A
Delay
CP-10 EQ
CP-10 EQ
CH 1
CH 3
Input Output
CH 5
Set the MSL-4 and DS-2P to the same polarity; reverse
the polarity for the CQ. The polarity for the 650-P depends
on the displacement from the flown system.
(48 pages)
(1 pages)
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