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Macro-Tech 600/1200/2400 Power Amplifiers

Page 10

If the air supply is unusually dusty, you might want to

pre-filter it using commercial furnace filters to prevent

rapid loading of the unit’s own air filter. When needed,

the unit’s filter can be cleaned with mild dish detergent

and water (see Section 4.5).

BLOWER

(OPTION 2)

BLOWER

(OPTION 1)

AIR

FLOW

FRONT

RACK

DOOR

AIR

FLOW

EQUIPMENT

RACK

(SIDE VIEW)

Fig. 3.3 Proper Air Flow in a Rack Cabinet

3 Installation

3.1 Mounting

Macro-Tech

amplifiers are designed for standard

19-inch (48.3 cm) rack mounting and “stack” mount-

ing without a cabinet. For more efficient cooling and

extra support in a rack, it is recommended that units

be stacked directly on top of each other.

Important: If the unit will be transported, it should also

be securely supported at the back of the rack.

Fig. 3.2 Top View of a Rack-Mounted Unit

AIR

FLOW

AIR FLOW

AMPLIFIER

(TOP VIEW)

RACK

CABINET

16 in

40.6 cm

2 in

(5 cm)

MIN.

IMPORTANT: Be sure rear of amplifier

is securely mounted to rack.

17 in

43.2 cm

AIR

FLOW

3.2 Cooling

NEVER block the side or front air vents.

Macro-Tech

amplifiers do not need to be mounted with space be-

tween them. If you must leave open spaces in a rack

for any reason, close them with blank panels to pre-

vent air from recycling into the front of other ampliers.

Allow at least 35 cubic feet (1 cubic meter) per minute

per unit for the

Macro-Tech 600

and

1200

, and at least

45 cubic feet (1.3 cubic meters) per minute per unit for

the

Macro-Tech 2400

. Additional air flow may be re-

quired when driving low impedance loads at consis-

tently high output levels. Refer to Section 7 for detailed

information on thermal dissipation.

Fig. 3.1 Mounting Dimensions

19 in

48.3 cm

16 in

40.6 cm

3.5 in

8.9 cm

2.5 in

6.35 cm

SIDE VIEW

LEVEL LEVEL

OFF

ENABLECH1 CH2

ODEP

SIGNAL

IOC

When mounting the amplifier in a rack, the side walls of

the rack should be at least 2 inches (5 cm) away from

the chassis as shown in Figure 3.2.

Tip:

An easy way to verify adequate cooling is to ob-

serve the ODEP indicators while the amplifier is oper-

ating under worst-case conditions. If the indicators

dim, additional cooling is recommended.

If your rack has a front door that could block air flow to

the amplifier’s air intakes, you must provide adequate

air flow by installing a grille in the door or by pressuriz-

ing the air behind the door. Wire grilles are recom-

mended over perforated panels because they tend to

cause less air restriction. A good choice for pressuriz-

ing the air behind a rack cabinet door is to mount a

“squirrel cage” blower inside the rack (Option 1 be-

low). At the bottom of the rack, mount the blower so it

blows outside air into the space between the door and

in front of the amplifiers, pressurizing the “chimney”

behind the door. This blower should not blow air into or

take air out of the space behind the amplifiers. For

racks without a door, you can evacuate the rack by

mounting the blower at the top of the rack so that air

inside the cabinet is drawn out the back (Option 2 be-

low).

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