Mackie M 1200 Manuel du propriétaire télécharger pdf (Page 16)

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.

M•1400 Rear Panel

SPEAKER OUTPUTS

––

SERIAL NUMBER

MANUFACTURING DATE

RISK OF ELECTRIC SHOCK

DO NOT OPEN

REPLACE WITH THE SAME TYPE FUSE AND RATING.

DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE

UTILISE UN FUSIBLE DE RECHANGE DE MÊME TYPE.

DEBRANCHER AVANT DE REMPLACER LE FUSIBLE

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT

EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.

NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

CAUTION

AVIS:

RISCQUE DE CHOC

LECTRIQUE — NE PAS OUVRIR

MONO

BRIDGE

CONCEIVED, DESIGNED, AND MANUFACTURED

BY MACKIE DESIGNS INC • WOODINVILLE • WA

98072 • USA • MADE IN USA • PATENTS PENDING

120 VAC 50/60 Hz

1500 WATTS

–

(MONO BRIDGE)

1400 WATTS

4 OHM LOAD MIN.

700 WATTS CH

2 OHMS LOAD MIN.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 42 43

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Mackie M 1200 Manuel du propriétaire Page 16

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