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
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