Placement

WARNING: Installation should only be done by an experienced technician. Improper

installation may result in damage to the equipment, injury or death. Make sure that the loudspeaker is installed in a stable and secure way in order to avoid any conditions that may be dangerous for persons or structures.

The HD1221 speaker is designed to sit on the floor or stage as the main PA or as monitors. It may also be pole- mounted via the built-in socket on the bottom of the cabinet. Be sure the pole is capable of supporting the weight of the HD1221. The Mackie SPM200 is a great option when using a sub. The HD1221 may also be flown horizontally or vertically via its 12 integrated fly points as detailed on page 11.

Check to make sure that the support surface (e.g., floor, etc.) has the necessary mechanical characteristics to support the weight of the loudspeaker(s).

When pole-mounting loudspeakers, be sure that they are stabilized and secured from falling over or being accidentally pushed over. Failure to follow these precautions may result in damage to the equipment, personal injury, or death.

As with any powered components, protect them from moisture. Avoid installing the loudspeaker in places exposed to harsh weather conditions. If you are setting them up outdoors, make sure they are under cover if you expect rain.

You can create a horizontal array by placing the cabinets side-by-side. However, you should have a good understanding of the relationship between the splay angle (the angle between the facing sides of the cabinets) and frequency cancellation effects between cabinets.

When two cabinets are positioned side-by-side such that the rear-angled faces of the enclosures are parallel, the splay angle will be 90º. This matches the 90˚ horizontal coverage pattern of each individual HD1221; the interference between the two cabinets will be minimized, but the total coverage of 180˚ may be too wide for some applications (see Figure A). The mid and high frequencies may also be reduced for those in the center who are too close to the loudspeakers.

Reducing the splay angle will reduce the total horizontal coverage, but it also creates an area both speakers are covering. Instead of a nearfield hole, this will cause comb-filtering effects in the frequency response in the overlapping area. The smaller the splay angle, the more energy will be delivered on-axis, but the comb-filtering effects will get worse at the same time (see Figure B).

Experimentation and experience will help you find the right trade-off for your application. In the end, the correct placement will depend on the environment and the necessary audience coverage.

Manual Owner’s

 

Interference

180˚

110˚

Figure A

 

Figure B

 

Two HD1221s horizontally arrayed with 180˚ coverage with no interference.

Two HD1221s horizontally arrayed with 110˚ coverage with center interference.

Owner’s Manual

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