Meyer Sound Cooling Systems and Rigging for CQ-2 Portable Speakers

Fans and Cooling System

The CQ uses a forced-air cooling system with two fans to prevent the amplifiers from overheating. A variable- speed primary fan runs continuously with an inaudible operating noise of 22 dBA at 1 m at its slowest speed. The speed of the primary fan begins increasing when the temperature of the heatsinks reaches 42°C. The fan reaches full speed at 62°C and is barely audible near the cabinet, even without an audio signal.

In the unusual event that the temperature reaches 74°C, the secondary fan turns on and is clearly audible. The secondary fan turns on in response to

•primary fan failure (check its status immediately);

•high source levels for a prolonged period in hot temperatures or direct sunlight;

•driver failure.

The secondary fan turns off when the temperature decreases to 68°C.

In the highly unlikely event that the secondary fan does not keep the temperature below 85°C, the CQ automatically shuts down until AC power is removed and reapplied. If the CQ shuts down again after cooling and reapplying AC power, contact Meyer Sound for repair information.

The fans draw air in through ducts on the front of the cabinet, over the heatsinks, and out the rear of the cabinet. Since dust does not accumulate in the amplifier circuitry, its life span is increased significantly. Make sure that the air ducts are clear and that there is at least 6 inches clearance for exhaust behind the cabinet.

cooling fans

air power

supply

heatsinks

A foam insert filter, in combination with the entire front grill surface, acts as an air filter for the cooling system. Despite the filtering, extensive use or a dusty operating environment can allow dust to accumulate along the path of the airflow, preventing normal cooling. We recommend periodically removing the grill, filter, and amplifier module and using compressed air to clear dust from the grill, filter, fans, and heatsinks.

Rigging

The maximum recommended load for a CQ with air- craft pan fittings is 500 lb (228kg). This working load is one-fifth the cabinet’s breaking strength. The CQ has two rigging brackets on both the top and bottom of the cabinet; each bracket is capable of supporting the full working load of the cabinet.

rigging brackets

(two on top, two on bottom)

Handles are for carrying only.

!Do not use them for rigging!

There are four types of interchangeable rigging brackets, each fastened by six Phillips screws:

•aircraft pan fittings (ring and stud)

•3/8”-16 nut plates

•M-10 x 1.5 metric nut plates

•blank plates (if no rigging brackets are requested)

NOTE: Units with nut plates are rated for the weight of one cabinet only.

Rigging load ratings assume a straight tensile pull and that the cabinet is in new condition with aircraft pan fittings. If these conditions are not met, the load ratings can be reduced significantly. Load ratings can also be reduced by age, wear, and damage. It is important to inspect the rigging hardware regularly and replace worn or damaged components immediately.

The standard model should not be installed outdoors without weather protection. The cabinet, exposed electronic circuitry, and drivers can all receive weather protection treatment that allows the unit to be used safely in wet conditions. Contact Meyer Sound for information about weather-protected units.

NOTE: All Meyer Sound products must be used in accordance with local, state, federal, and industry regulations. It is the owner’s and/or user’s responsibility to evaluate the reliability of any rigging method for their application. Rigging should be done only by experienced professionals.

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