Mackie M 1200 Manuel du propriétaire télécharger pdf (Page 23)

GENERAL PRECAUTIONS AND CONSIDERATIONS

AC POWER CONSIDERATIONS

Be sure the M•1200/M•1400 is plugged into

an outlet that is able to supply 120VAC at high

current. If the voltage should drop below

116VAC, the M•1200/M•1400 will no longer be

able to supply rated power. (It will continue to

operate down to 50% of the rated voltage, but it

just won’t be able to reach full rated power.)

Be sure the AC outlet can supply enough

current to allow full power operation of all the

amplifiers plugged into it. The outlet should be

a three-prong socket that matches the power

cord.

WARNING: Bypassing the plug’s ground pin

can be dangerous. Please don’t do it.

The AC current demand of an amplifier var-

ies depending on several factors, including the

crest factor and the duty cycle of the program

material. Under typical conditions reproducing

rock music where musical peaks are just below

clipping, the M•1200/M•1400 will require the

following average currents:

RACK MOUNTING

The M•1200/M•1400 amp requires two rack

space units (2U = 3.5"). It also requires 16.25"

depth inside the rack, including the rear sup-

ports. When designing your rack, put the

heavier items at the bottom and the lighter

items toward the top.

Secure the front panel of the amplifier to

the front of the rack using four screws with soft

washers to prevent scratching the panel. In ad-

dition, because of the weight of the amplifier,

you must secure the rear support brackets of

the amplifier to the back of the rack. You could

use a support rail or shelf across the back of

the rack, or angle brackets attached between

the rear support brackets and the rear rails of

the rack. This is recommended for all compo-

nents mounted in a rack that is going to be

moved frequently (or thrown in the back of a

pickup truck and transported down a bumpy

gravel road to that outdoor festival!).

THERMAL CONSIDERATIONS

The M•1200/M•1400 amps are fan-cooled

and bring air in through the front and out

through the sides. Make sure that cool air is

available at the front of the amplifier, and that

there is room on each side for the warm air to

exit from the amplifier and dissipate. If rack-

mounted, make sure there is room for the

warm air to circulate around the side and out

through the rear of the rack. In a typical rack,

there will be a space of 1 to 2 inches on either

side of the amplifier. This is adequate to allow

the warm air to exit from the amplifier.

The M•1200/M•1400’s unique T-Design

Constant Gradient Cooling Tunnel provides

substantially better cooling for the output tran-

sistors than conventional designs that simply

blow air through the chassis, getting dust and

other contaminants over all the internal

components. The Cooling Tunnel provides a

shorter, more directed path so the cool air con-

centrates on the heat produced by the output

devices. This results in increased reliability

and longevity for the amplifier.

Average Peak

Current Current

Amplifier Loading Required Required

2 ohms per side or 4 ohms bridged 8A 25A

4 ohms per side or 8 ohms bridged 5A 16A

8 ohms per side or 16 ohms bridged 3.2A 10A

It is recommended that a stiff supply of AC

power be used because the amplifier places

high current demands on the AC line. The

more power that is available on the line, the

louder the amplifier will play and the more

peak output power will be available for cleaner,

punchier bass.

Having said this, we also realize that in

many applications a standard 15A service may

be all that is available. Under typical condi-

tions, reproducing rock music where musical

peaks are just below the clipping point, you

can safely connect more than one amplifier to

a 15A service. Use the table below as a guide-

line:

Maximum Number

of Amplifiers

Amplifier Loading on a 15A Service

2 ohms per side or 4 ohms bridged 2

4 ohms per side or 8 ohms bridged 3

8 ohms per side or 16 ohms bridged 5

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 42 43

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Mackie M 1200 Manuel du propriétaire Page 23

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