Mackie AM4120 User Manual

AM 4000 Series

Integrated Mixer/Amplifier

AM4120

AMPLIFIER

■ The AM4120 is designed for continuous duty

in speech, music, paging and sound reinforcement
applications in churches, schools, offices, arenas, hotel
meeting rooms, convention centers, recreation facilities
and other venues demanding high performance, flexible
features and rugged dependability.

■ Four microphone inputs are actively balanced, have

XLR connectors, and can be programmed to interrupt or
attenuate the line level inputs. Microphone inputs 2-4
feature switched 24V phantom power and switched
high-pass and low-pass filters. Microphone Input 1 can
be switched to line level, set to have priority over all
inputs, and can be activated by either VOX with an
adjustable threshold or a contact closure. Activation of
any microphone override provides 18Vdc (300mA) at a
barrier connector on the rear panel, which may be used
to drive LEDs or relays. Two unbalanced, stereo Aux
inputs are internally summed to mono and selected by
a switch on the front panel. Two unbalanced Tape (auxil­iary) line level outputs with a level control and an
unbalanced signal processing loop are also provided.
All are terminated to RCA connectors.

■ Output modes include 4Ω and 25V, 50V, 70V and

100V constant voltage. The smart output stage is fully
protected against permanent damage caused by over­loading, shorts and extreme temperatures. The AM4120
will operate on either 115 or 230VAC, 50/60Hz sup­plied by a detachable IEC power cord. Insulated termi­nals to connect a backup 24Vdc battery are provided
on the rear panel. Switchover to DC is automatic.

■ The front panel provides level controls for each

Mic, selected Aux and Master volume, as well as the
Bass and Treble shelving filters. The control knobs can
be easily removed for security, and their recessed
shafts covered with inserts supplied with the unit. LEDs
indicate power, signal present at the output, peak and
output overload. 12dB/octave Bass and Treble shelving
equalization with up to 12dB of boost or cut at 100Hz
and 10kHz can be applied to the output signal.

■ Accessories include an easily installed chime card.

■ This Mackie Industrial product is covered by an

exclusive, one-time, NO FAULT repair policy in addition
to a five year limited warranty.

Features

■ 4 Lo-Z, XLR Microphone Inputs

■ 2 Stereo Auxiliary Inputs

■ 120 Watt RMS, Convection Cooled

■ 4Ω - 25V - 50V - 70V - 100V Outputs

■ Switched 24V Phantom and H-P/L-P Filters

■ 2 Tape/Aux Outputs with Level Trim

■ Signal Processing Loop

■ 2 RU Rack Mounting Kit included

■ Automatic 24Vdc Backup Power Input

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AM4120

APPLICATIONS

■ Foreground/Background Music Systems

■ Sound Reinforcement Systems

■ Paging Systems

■ Continuous-duty Applications

Integrated Mixer/Amplifier

AM4120

AMPLIFIER

AM4120

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Specifications

Performance

Amplifier Power: 120W, nominal,

180W peak (10mS)
Frequency Response: 50Hz–15kHz ±3dB
Distortion: Less than 1% THD at

1kHz nominal power

Noise: Better than 65dB

Equalization

Output: Treble shelving: ±12 dB at 10kHz

Bass shelving: ±12 dB at 100Hz

Inputs 2–4: H-P filter: 12dB/oct. at 300Hz

L-P filter: 12dB/oct. at 7kHz

Audio Inputs

Microphones: Three, active balanced XLR,

LoZ, 1.3mV, 24V phantom

powering with on-off switch

Microphone/Line: One, active balanced XLR and

parallel barrier, switched mic/line;

Mic: LoZ, 1mV, Line: 80mV

Line Level: Three, unbalanced, RCA connectors.

Two each, left and right (summed) Aux,

either pair selectable via

front-panel switch, 100mV;

One, Main (signal processing return), 775mV

Audio Outputs

Number of Channels: One
Low Impedance: 4Ω
Constant Voltage: 25V, 50V, 70V, 100V

Barrier connectors

Line Level: One, signal processing output, 2.5V, 600Ω

Two, tape (auxiliary) outputs 0–2.2V,

RCA connectors

Control Inputs & Outputs

DC Outputs: LED relay output, aux DC

output: 18Vdc (300mA)

activated by priority

Inputs: Priority switch input, dry contact closure

barrier connectors

Controls

Front Panel: Power switch, master Volume,

Inputs 1–4,

Aux level, Aux 1/2 Switch,

Treble shelving, Bass shelving

Rear Panel: Tape output level,

Voice priority threshold,

Chime output level (if installed),

24V phantom on/off switch,

H-P Filter in/out switch,

L-P Filter in/out switch,

Source Voltage Selector switch

Power Supply

115/230Vac (±5%), 50/60Hz,

450VA DC (24V battery) 10A/Hr

Environment

Maximum Ambient: 131°F (55°C),

Non-precipitating humidity

Physical

Dimensions (HxWxD): 3.46" x 17" x 12.4"

(88mm x 431mm x 314mm)
Weight: 25.4lbs. (11.5kg)
Finish: Black painted or treated steel,

white nomenclature

Warranty

3 years, parts & labor

one-time no-fault repair policy

Accessories

A1708 Three Chime Card
RM4000 Rack Mounting Ears

Integrated Mixer/Amplifier

AM4120

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POWER

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SIGNAL

AM 4120 - P.A. AMPLIFIER

OVE RLOAD

EQ

AUX

INPUT LEVELS

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MANUFACTURING DATE

CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE INDUSTRIAL • MADE IN ITALY

PATENTS PENDING • COPYRIGHT ©1999 • THE FOLLOWING ARE TRADEMARKS/REGISTERED

TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "MACKIE INDUSTRIAL", & THE "RUNNING MAN" FIGURE

Integrated Mixer/Amplifier

AM4120

AMPLIFIER

AM4120

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Architects’ and Engineers’ Specifications

The integrated mixer/amplifier shall have a nominal out­put power of at least 120W RMS. It shall operate on 115VAC
or 230VAC at either 50Hz or 60Hz and have its source power
supplied by a detachable IEC power cord. In addition the unit
shall be capable of being directly powered by a 24Vdc
source, such as storage batteries. It shall have a power
switch on the front panel. The unit shall have a constant­impedance output to drive a 4Ω load at its rated output. It
shall also have 25V, 50V, 70V and 100V constant-voltage out­puts with like performance.

Inputs to the unit shall include: at least four actively bal­anced microphone; two unbalanced, stereo Aux; and an
unbalanced signal processing return. Outputs shall include:
at least two unbalanced Tape (auxiliary) jacks with a com­mon, continuously variable level control; and one signal pro­cessing send. Balanced connections shall be made through
XLR connectors and unbalanced connections through RCA
connectors.

Microphone Input 1 shall have adjustable sensitivity
between mic and line, selected by a switch on the rear panel.
This input shall also be programmable to completely exclude
or attenuate all other inputs when its priority link is activated
by either a contact closure or a VOX circuit, with a continu­ously adjustable threshold. The XLR connector for Input 1
shall be wired, in parallel, to a barrier strip on the rear panel.
Microphone inputs 2-4 shall have a 24V phantom powering
circuit that can be disabled with a switch on the rear panel.
These inputs shall be equipped with a high-pass filter and a
low-pass filter having a response of 12dB/octave and fixed

–3db points at 300Hz and 7kHz, respectively. Each of these
filters shall be enabled by a switch on the rear panel.

Additionally, these inputs shall be programmable to com­pletely exclude or attenuate all other inputs except for micro­phone input.

Two auxiliary voltage outputs shall be provided on the
rear panel to drive accessory relays and LEDs. The relay out­put shall deliver +18Vdc at 300mA. Voltage shall go high
when any microphone priority function is active.

The unit shall have, on its front panel, continuously vari­able controls for each microphone input, an auxiliary input
selector switch, a master volume control, as well as bass and
treble shelving filter controls. The shelving filters shall have a

range of ±12dB, with the frequency for the bass fixed at
100Hz and the treble fixed at 10kHz. LED status indicators
shall be provided on the front panel to indicate power, signal
present at the output terminals, peak signals near clipping
and an overload condition.

The integrated mixer/amplifier shall be a model AM4120,

manufactured by Mackie Industrial.

www.mackieindustrial.com

16220 Wood-Red Rd. NE, Woodinville, WA 98072 USA

888.337.7404, fax [phone], [e-mail]

UK +44.1268.571.212, fax [phone], [e-mail]
ITALY +39.0522.354.111, fax [phone], [e-mail]
FRANCE +33.3.8546.9160, fax [phone], [e-mail]
GERMANY +49.2572.96042.0, fax [phone], [e-mail]

Electronic files for this product available at:
www.mackieindustrial.com

This Specification Sheet AM4120.PDF
Quick-Start Manual AM4120QS.PDF
Owner/Operator’s Manual AM4120ML.PDF

Mackie Designs continually engages in research related to product improvement. New material, produc­tion methods, and design refinements are introduced into existing products withoutnotice as a routine
expression of that philosophy. For thisreason, any current Mackie Industrial product may differ in some
respect from its published description, but will always equal or exceed the original design specifications
unless otherwise stated. ©1999-2001 Mackie DesignsInc. All rights Reserved. and are
registered trademarks of Mackie Designs Inc. Mackie Industrial is a trademark of Mackie Designs Inc.

part no. 910-140-10 Rev.B