8
PSW-2 Flown with MSL-4;
650-P on the Floor
Including subwoofers in a flown cluster provides a
smooth frequency image because the low and mid-hi
frequencies are produced from speakers located close
together. The identical dimensions of the PSW-2 and
MSL-4 allow them to be easily flown together.
The CH 1 Mid-Hi output drives the MSL-4 with the
Lo Cut filter in. The CH 1 Sub and DS-2 outputs drive
the 650-Ps and PSW-2s with the DS-2 & Sub Crossover
switch out, sending a full-range signal to each speaker
with independent levels.
650-P
subwoofer
on the floor
MSL-4 and
PSW-2
flown in
same cluster
CH 1 Mid-Hi
CH 1 Input CH 1 DS-2
CH 1 Sub
LD-1A
Line Driver
Set the MSL-4 and PSW-2 to the same polarity. The
polarity of the 650-P depends on the height and distance
of the measurement position from the subwoofers and
flown cluster.
MSL-4, DS-2P, 650-P with CQ Down-fill
This example shows the LD-1A integrating a complete
system of self-powered speakers for a large venue.
The diagram shows half of the system using channels 1,
3, and 5; identical connections can be used for channels 2,
4, and 6 to create the other half. The MSL-4, DS-2P, and CQ
arrays are flown; the 650-Ps are on the floor.
The CH 1 Mid-Hi and CH 3 outputs drive the inner three
and outer two speakers of the MSL-4 array, applying
appropriate levels for speakers directed at different
distances. 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 CQ down-fills) accomplishes the same signal
routing. The Lo Cut and Array EQ switches for CH 1
and 3 should be in. The Lo Cut filters eliminate the LF
rise caused by the overlap in frequency response between
the MSL-4 and DS-2P/650-P systems. The Array EQ
filters minimize the MSL-4 array’s low-mid rise.
The CH 1 DS-2 and Sub outputs drive the DS-2P and 650-
P systems with the DS-2 & Sub Crossover switch in. Set
the MSL-4 and DS-2P to the same polarity. The polarity of
the 650-P depends on the height and distance of the mea-
surement position from the subwoofer and flown systems.
CH 5 controls the CQ down-fill system. Since the main
system is more powerful 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 intersecting coverage area:
• Set the CQ to the opposite polarity to the MSL-4 to
phase align the mid-hi frequencies and minimize
the MSL-4’s LF down-lobe.
• Use the CH 5 Lo Cut filter to eliminate the LF rise
caused by the overlap in frequency response with
the 650-P and DS-2P systems.
• Delay the down-fill to compensate for the propa-
gation delay between the down-fill and main
systems in the intersecting coverage area.
We recommend that the entire system be measured,
phase-aligned, and equalized using the SIM System II
Sound Analyzer and CP-10 Parametric Equalizer.
Set the MSL-4 and DS-2P to the same polarity; reverse the
polarity of the CQ. The polarity of the 650-P depends on the
distance of the measurement position from the subwoofer
and flown systems.
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