Crown Audio STUDIO AMPLIFIER owner manual Stereo Mode, 5 Stereo Wiring, Page

Studio Reference I & II Professional Studio Amplifiers

AIR

FLOW

AIR

FLOW

BLOWER

(OPTION 2)

EQUIPMENT

RACK

(SIDE VIEW)

BLOWER

(OPTION 1)

FRONT

OF

RACK

DOOR

you may want to install supplemental cooling like a rack-mounted blower or an air conditioner.

A “squirrel cage” blower can be installed at the bottom of the rack so it blows outside air into the space be- tween the door and the front of the amplifiers. This will pressurize the “chimney” behind the door (Figure 3.4, Option 1). The blower should not blow air into or take air out of the space behind the amplifiers. For racks without a front door, you can evacuate the rack by mounting the blower at the top of the rack so air blows out the back (Figure 3.4, Option 2). You can estimate a rack’s required air flow by adding each unit’s maxi- mum air flow rating. The Studio Reference I and II can each move up to 45 cubic feet (1.3 cubic meters) of air per minute. So if you put one of each in a rack, you

Fig. 3.4 Proper Air Flow with a Rack-Mounted Blower

mounting, piles of power cords, clogged dust filters and closed rack doors. Mount your amplifier to allow suffi- cient air flow into the front intake, out the side exhaust vents, and out the back of the rack. An air flow restriction like a pile of power cords can simply be moved out of the way. Air filters should be cleaned using the procedure in Section 4.5. If rack doors are the problem, you can leave them open, remove them, or install a grille. If you install a grille, we recommend using a wire grille because per- forated panels restrict air flow by at least 40%.

If your ODEP indicators still dim under demanding con- ditions, we recommend that you check the table of indicator states in Figure 4.2 to eliminate other condi- tions that could be the source of the problem. If it is clear that the amplifier does not have sufficient air flow,

would need 90 cubic feet (2.5 cubic meters) of air flow through the rack per minute under worst-case condi- tions (45 cubic feet + 45 cubic feet = 90 cubic feet).

Another way to increase cooling is to use air condition- ing. It is rarely a necessity because internal fans and rack-mounted blowers almost always provide enough air flow for the most extreme conditions. Still, air condi- tioning helps reduce the ambient temperature of the air flowing through the rack. If you plan to use air condi- tioning, refer to Section 7 for information on calculating the hourly thermal dissipation of your system.

3.3 Wiring

Figures 3.5 through 3.7 show common ways to set up a Studio Reference amplifier. Input and output connec- tors are located on the back panel. Be careful when

STEREO MODE

CHANNEL 2

LOUDSPEAKER –

+

CHANNEL 1

CHANNEL 2
MIXER
	CH-2	CH-1
FX
PUSH	PUSH

ReferenceS T U D I O

STUDIO REFERENCE	STEREO
AMPLIFIER
PARALLEL	BRIDGE
MONO	MONO

CAUTION: TURN OFF AMPLIFIER

BEFORE CHANGING THIS SWITCH!

Fig. 3.5 Stereo Wiring

CHANNEL 1 LOUDSPEAKER +

–

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