Meyer Sound MSL-4

LD-1A with MSL-4 and 650-P

A typical MSL-4:650-P ratio is 2:1 but 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. The

Lo Cut ﬁlter for CH1 Mid-Hi should be in to correct the LF

rise between the MSL-4 and 650-P.

MSL-4

650-P

CH 1 Sub

CH1

Input

CH 1 Mid-Hi

LD-1A

Line Driver

Set the MSL-4 and 650-P to the same polarity.

LD-1A with Flown PSW-2 and 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 loudspeakers 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, which

sends a full-range signal with independent level control to

each loudspeaker.

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 for

the 650-P depends on the height and distance of the measure-

ment position from the ﬂown and subwoofer systems.

LD-1A with Flown MSL-4, DS-2P/DS-4P, and CQ;

650-P on the Floor

This example shows the LD-1A integrating a complete system

of self-powered loudspeakers for a large venue. Although the

diagram shows half of the system with channels 1, 3, and 5,

channels 2, 4, and 6 can be used with identical connections for

the other half. The MSL-4, DS-2P/DS-4P, 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 loudspeakers of the MSL-4 array, applying appro-

priate levels for loudspeakers directed at different distances.

The diagram shows the additional mid-hi output created by con-

necting 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 both channels should be in. The Lo Cut ﬁlters eliminate

the LF rise caused by the frequency response overlap between

the MSL-4 and DS-2P/DS-4P/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/DS-4P and

650-P loudspeaker systems with the DS-2 & Sub Crossover

switch in. Set the MSL-4 and DS-2P/DS-4P to the same

polarity. The polarity of the 650-P depends on the height and

distance of the measurement 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 loudspeakers 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/DS-4P systems.

• Delay the down-ﬁll to compensate for the propagation

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.