Mackie M1200/M1400 Input, Be Aware Should you, Choose to terminate your Speaker cables with

In fact, you can use both the 1/4" jacks and the binding posts simultaneously. Just remem- ber that doing so creates two parallel loads.

Please see “Do The Math: Ohms, Loads and Such” in Appendix E to learn about speaker loads.

Be Aware: Should you

choose to terminate your

speaker cables with the

1/4" TS plugs, make sure

nobody confuses these cables with line-level cables, (i.e., guitar cables). Guitar cords are not designed to handle the high current output of power am- plifiers. And line-level inputs (like the signal input on a mixer) are not designed to handle speaker-level voltages.

If you’re using low impedance loads at high power levels, we recommend that you use the binding post speaker outputs rather than the 1/4" TS jacks. Although 1/4" jacks are conve- nient and easy to use, they were not designed to handle high-level currents.

Note (M•1400 only): In addition to the binding posts, the M•1400 also has Speakon® connectors for connecting the speakers to the amplifier. These are locking connectors that are easy to attach and are designed to handle high power levels into low-impedance loads. Pin 1+ is positive (+) and Pin 1– is negative (–).

Before making connections

to an amp or reconfiguring

an amp’s signal routing,

turn the amp’s GAIN controls down, turn the POWER off, make the changes, turn the

POWER back on, and then turn the GAIN con- trols back up. Although the M•1200/M•1400 amplifiers can handle “opens” (no connection)

and “shorts” (positive and negative signal lines in direct contact), you don’t want the speaker ends of live cables to zap every piece of equip- ment they touch as they’re being dragged across the stage.

Ordinarily, applying a posi-

tive voltage to a speaker’s

positive input and negative

voltage to the negative input

results in an outward excur- sion of the woofer. But some woofers are built with reverse polarity, meaning that the above conditions result in an inward excursion.

If you’re not sure which type of speakers you have, take a look at their literature. If you’re still not sure, here is a simple test: take a 1.5V flashlight battery and connect the positive terminal of the battery to the positive (+) in- put of the speaker, and connect the negative terminal of the battery to the negative (–) in- put of the speaker. Observe the motion of the speaker cone. It should move out when voltage is applied, and return to rest when voltage is removed. Make sure all the speakers in the system move in the same direction (there are a few exceptions — some speakers are deliber- ately designed with reverse-polarity woofers).

INPUT

The M•1200/M•1400 amplifiers give you a choice — they have the traditional XLR inputs, as well as 1/4" TRS (tip-ring-sleeve) input jacks. Sonically (and electrically) they’re identical, so choose either one. Since these two inputs are in parallel (the THRU jacks are in parallel with the inputs as well), you shouldn’t connect more than one source to the SIGNAL INPUT jacks. Each can be used with either balanced or unbalanced signals.

		CAUTION	WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
			EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
		RISK OF ELECTRIC SHOCK	NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
		DO NOT OPEN	AVIS: RISCQUE DE CHOC ÉLECTRIQUE — NE PAS OUVRIR
		REPLACE WITH THE SAME TYPE FUSE AND RATING.		UTILISE UN FUSIBLE DE RECHANGE DE MÊME TYPE.
(MONO BRIDGE)		DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE		DEBRANCHER AVANT DE REMPLACER LE FUSIBLE
1400 WATTS
4 OHM LOAD MIN.		MONO
700 WATTS CH	CH		–	CH
2 OHMS LOAD MIN.		+ BRIDGE
	1			2
		+		+
		–		–
120 VAC 50/60 Hz
1500 WATTS
		SPEAKER OUTPUTS

SERIAL NUMBER MANUFACTURING DATE

CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE DESIGNS INC • WOODINVILLE • WA 98072 • USA • MADE IN USA • PATENTS PENDING

M•1400 Rear Panel

16