GENERAL PRECAUTIONS AND CONSIDERATIONS

RACK MOUNTING

The M•1400/M•1400i amp requires two rack space units (2 IU = 3.5"). It also requires 16.25"(M•1400) or 16.38" (M•1400i) depth inside the rack, including the rear supports. 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 components 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•1400/M•1400i amp is fan-cooled and brings 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•1400/M•1400i’s unique T-Design Constant Gradient Cooling Tunnel provides substantially better cooling for the output transistors 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 concentrates on the heat produced by the output devices. This results in increased reliability and longevity for the amplifier.

AC POWER CONSIDERATIONS

Be sure the M•1400/M•1400i is plugged into an outlet that is able to supply the correct voltage specified for your model.

If the line voltage should drop below about 97% of the rated voltage, the M•1400/M•1400i will no longer be able to supply rated power. (It will continue to operate down to 50% of the rated line 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 socket that matches the power cord.

WARNING: Bypassing the plug’s ground pin can be dangerous. Don’t do it!

The AC current demand of an amplifier varies 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•1400/M•1400i requires the following average currents:

 

AveragePeak

 

Current

Current

Amplifier Loading

Required

Required

 

120V

240V

120V

240V

2 ohms per side or 4 ohms bridged

8A

4A

25A

12.5A

4 ohms per side or 8 ohms bridged

5A

2.5A

16A

8A

8 ohms per side or 16 ohms bridged

3.2A

1.6A

10A

5A

 

 

 

 

 

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.

Under typical conditions, reproducing rock music where musical peaks are just below the clipping point, you can safely connect more than one amplifier to an AC service. Use the table below as a guideline:

Maximum Number of Amplifiers

 

on a 120V/15A Service

Amplifier Loading

(or 240V/7.5A 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

Due to in-rush current, you should avoid turning them all on at the same time. Rather, sequence them on, one at a time, to prevent popping the circuit breaker.

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