QSC ALKMD-2 Owners manual

1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA
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ALK-MD2 Array Link Kit for Two MD-series Loudspeaker Enclosures

This kit is to be used only for arraying of two QSC MD series loudspeaker enclosures, active or passive. Do not use this kit or any component of
this kit for any other purpose.

Contents:

•Array link, AL-MDR2 2 each

•Array link, AL-MDF 2 each

•Bolt, hex, cap, 3/8”-16TPI x 1.5", grade 5 8 each

•Washer, flat, 7/16" x 1" , .07” - .09” thick 14 each (3 are spares)

•Washer, lock, internal tooth, 3/8" 14 each (3 are spares)

•Eyebolt, 3/8”-16TPI x 1.5” 3 each

Rules for Suspension

• Correct use of all suspension hardware and components is imperative in sound system rigging and deployment.

• Always calculate suspended loads before lifting to ensure suspension components and hardware are used within their respective load lim­its.

• Research local codes and regulations to fully understand the requirements for suspended loads in the venue in which the equipment is to be
suspended.

• Be absolutely certain of the integrity of any structural member intended to support suspended loads. Hidden structural members can have
hidden structural weakness.

• Consult a professional mechanical or structural engineer licensed in the jurisdiction of the sound system installation to review, verify, and
approve all attachments to the building or structure.

• Never assume anything- owner or third-party supplied suspension attachment points may not be adequate for the loads to be suspended.

• Employ the services of a professional rigger for hoisting, positioning, and attaching the equipment to the supporting structure.

• Always inspect all components (enclosures, suspension brackets, pins, frames, bolts, nuts, slings, shackles, etc.) for cracks, wear, deforma­tion, corrosion, missing, loose, or damaged parts that could reduce the strength of the assembly before lifting. Discard any worn, defective,
or suspect parts and replace them with new appropriately load-rated parts.

Shock Loading

When a load is either moved or stopped, its static weight is magnified. Sudden movements can magnify the static weight several times. This
magnification of static weight is termed "shock loading". Shock loading poses a danger to equipment and workers. The effects of shock loading
can be instantaneous, or they may remain undetected unless the equipment is visually damaged. Avoiding shock loading requires careful plan­ning and knowledge of equipment, rigging, and lifting practices.

• Shock loading of equipment and structures is usually confined to lifting and installation, but natural forces (winds, earthquakes) can impose
shock loads several times the static load. This is why structures and suspension equipment must be capable of supporting several times the
weight of the equipment suspended.

Working Load Limits

Component Weight 7:1 Design Factor 10:1 Design Factor 12:1 Design Factor

MD-F, MD-L, MD-FP, and MD-LP loudspeakers,

top and side panel suspension points

MD-F, MD-L, MD-FP, and MD-LP loudspeakers,

rear panel suspension points

Eyebolt n/a 857 lb

90 lb

(40.8 kg)

n/a 314 lb

(207.3 kg)

(142.4 kg)

(388.7 kg)

457 lb

320 lb

(145.2 kg)

220 lb

(99.8 kg)

600 lb

(272.2 kg)

267 lb

(121.1 kg)

183 lb

(83.0 kg)

500 lb

(226.8 kg)

*TD-000242-00*

TD-000242-00 revA

Installation Instructions

1. Orient the enclosures with their bottoms pointing upward and
the required splay angle.

2. Remove the factory-installed screws from the enclosures
where the bolts are to be installed for the ALK-MD2 kit.

3. Set the rear (AL-MDR2) and front (AL-MDF) links on the enclo­sures and position the assembly until the mounting holes line
up at the required splay angle.

4. Assemble a lock washer, then a flat washer, onto each bolt. Put
the bolt assembly through the selected mounting hole in the
array link and thread the bolt into the enclosure’s threaded in­sert. Tighten fully.

5. Carefully turn the array over, ensuring not to stress the links
previously installed. Repeat steps 2 - 4 for the top surface of
the enclosures.

6. For a vertically oriented array, install two eyebolt assemblies;
one on each enclosure’s top surface, outermost front threaded
insert. Ensure each eyebolt has a lock washer, then a flat
washer installed before threading into the enclosure. Tighten
eyebolts fully. Use the lower rear array link for pull back.

Figure 1- Vertically oriented array and hardware assembly order.

7. For a horizontally oriented array, install two eyebolts on the
side of the enclosure that will become the top of the array. A
third eyebolt should be used on the back of the lower enclosure
of the array for setting downtilt angle and stabilization.

Figure 2- Horizontally oriented array. Note eyebolt installation locations.

Figure 3- Minimum splay angle example.

© Copyright 2007, QSC Audio Products, Inc.

QSC® is a registered trademark of QSC Audio Products, Inc.

“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office

All trademarks are the property of their respective owners.

Figure 4- Maximum splay angle example.