Mackie M3000 User Manual download pdf (Page 14)

M-Series

ing. The Thru jacks are wired straight from the XLR and

TRS INPUTs — there is no electronic circuitry between

— so the signal going into the amp is exactly the same

as the signal coming out of the Thru jacks.

You can use the Thru jack as an input, if necessary,

since it’s wired in parallel with the other input con-

nectors. You can also use the 1/4" TRS INPUT jacks as

Thru jacks. Simply connect the 1/4" TRS INPUT jacks

on the ﬁrst ampliﬁer to the TRS 1/4" INPUT jacks on the

second ampliﬁer using 3-conductor shielded cables with

TRS plugs on both ends.

Warning: If you use a regular guitar cord with 2-

conductor TS plugs, you’ll unbalance the signal at the

screw terminal input by grounding the low side (–) of

the signal (pin 3).

11. 150 Hz X-OVER

This switch allows you to turn your M-Series ampli-

ﬁer into a combination two-way crossover and power

ampliﬁer. You can use one channel to power a woofer or

subwoofer, and the other channel to power the mid and

high frequencies.

For normal operation, leave the switch in the FULL

position. This allows full-range operation for that chan-

nel (no crossover ﬁlter).

With the switch in the LPF (low-pass ﬁlter) position,

all the frequencies below 150 Hz are allowed through

the channel, and all the frequencies above 150 Hz are

rolled off with a 2nd-order Butterworth ﬁlter.

With the switch in the HPF (high-pass ﬁlter) position,

all the frequencies above 150 Hz are allowed through

the channel, and all the frequencies below 150 Hz are

rolled off with a 2nd-order Butterworth ﬁlter.

To use the X-OVER switches in a two-way or bi-ampliﬁed

system:

1. Connect the same input signal to Channel 1 and

Channel 2 inputs. If you are using the screw termi-

nal inputs, you could jumper the signal over from

Channel 1 to Channel 2 as shown below.

GND

CHANNEL 1

GND

CHANNEL 2

GND

CHANNEL 1

GND

CHANNEL 2

JUMPERS

SHIELD

HOT (+)

COLD (--)

If you are using the combination input, you could

use the Thru connector from Channel 1 to connect

to the input of Channel 2.

2. Set the AMP MODE switch to STEREO.

Note: You cannot use the AMP

MODE switch set to MONO to ac-

complish this because the X-OVER

switches are located before the AMP

MODE switch in the signal path.

3. Set the X-OVER switch on Channel 1 to LPF and the

X-OVER switch on Channel 2 to HPF.

4. Connect the Speaker Output for Channel 1 to the

woofer or subwoofer speaker cabinet.

5. Connect the Speaker Output for Channel 2 to the

full-range or mid/high speaker cabinet.

You could also use the X-OVER switch as a high-pass

ﬁlter for both channels. For example, in a monitor sys-

tem, many monitor speakers don’t reproduce frequen-

cies below 100 Hz or 150 Hz. By rolling off the lower

frequencies, you can preserve the ampliﬁer’s power for

the frequencies that count, and the system will sound

louder and cleaner.

12. LIMIT

The LIMITER is not designed to alter your sound — it’s

just there to protect your speakers from clipping. Its ef-

fect is virtually transparent, meaning you probably won’t

4000

AC LINE

BREAKER

(PUSH TO RESET)

SERIAL / DATE CODE

BRIDGE

1 2

BRIDGE

PIN 1 = CH1

PIN 2 = CH2

PIN 1 = BRIDGE

PIN 2 = UNUSED

PIN 1 = CH2

PIN 2 = UNUSED

LETHAL

VOLTAGES

MAY APPEAR

AT OUTPUT

TERMINALS.

CLASS 3 WIRING

IS REQUIRED.

SPEAKER OUTPUTS

ON/

TYPICAL

LIMIT

OFF

STEREO

AMP

MODE

MONO

BRIDGE

CAUTION

GND

CHANNEL 1

GND

CHANNEL 2

ON/

TYPICAL

LIMIT

OFF

MANUFACTURED IN CHINA • FABRIQUE EN CHINE

THE “RUNNING MAN” FIGURE ARE REGISTERED

TRADEMARKS OF LOUD TECHNOLOGIES INC.

1300W / CH

4Ω LOAD MIN

2600W BRIDGE

8Ω LOAD MIN

~120VAC 60Hz 1600W

INPUT

LPF

HPF

FULL

LPF

HPF

FULL

150Hz

X-OVER

150Hz

X-OVER

RISK OF ELECTRIC SHOCK • DO NOT OPEN

CAU T ION

HIGH EFFICIENCY POWER AMPLIFIER

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Mackie M3000 User Manual Page 14

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