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.

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

Mid-hi

CQ-1 or CQ-2

frequency rise caused by the overlap with the

650-P/DS-2P systems.

LD-1A

Line Driver

Sub

650-P

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.

• 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.

MSL-4 Mid-Hi

	LD-1A
	CH 1
CP-10 EQ	Input	Mid-Hi
		Output
	Loop	DS-2	DS-2P Mid-Bass
		Output	DS-2P Mid-Bass
		Sub
		Output
Delay	Input	Output
	CH 3
CP-10 EQ	Input	Output
	CH 5

CQ Down-fills

650-P Subwoofers

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.