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Marshall Electronics
AR-AM4
Analog Audio Monitor
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Operating Instructions
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Contents
Product Overview ...............................................................................................................................5
Features...............................................................................................................................................5
Installation and Initial Setup ..............................................................................................................5
Unpacking........................................................................................................................................................ 5
Audio Monitor Mounting .............................................................................................................................. 5
Quick Start Guide................................................................................................................................6
Front Panel Features ..........................................................................................................................7
Rear Panel Features ...........................................................................................................................8
Basic Operation ..................................................................................................................................9
Overview........................................................................................................................................................... 9
Volume Control...............................................................................................................................................................................9
Channel Select................................................................................................................................................................................9
Balance Control ..............................................................................................................................................................................9
Headphone Output..........................................................................................................................................................................9
Specifications....................................................................................................................................10
AR-AM4 Audio Monitor............................................................................................................................... 10
Input / Output ................................................................................................................................................ 11
Warranty ............................................................................................................................................12
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Product Overview
The AR-AM4 is a four-channel stereo analog audio monitoring system. Designed for ultra-near field audio monitoring in
space critical environments, the AR-AM4 is ideal for TV facilities, studios, post-production facilities, VTR bays, mobile
production vehicles, satellite links, and wherever analog audio monitoring is required.
The AR-AM4 features stereo loudspeakers in a compact 1RU form factor, with analog amplification and digital processing
providing pristine audio quality.
Features
■
Selectable Inputs
Choose between 4 independent sets of stereo inputs.
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Superior Audio Quality
Stereo Loud Speakers provide superior audio quality in a compact 1RU form factor.
■
Digital Processing
Digital signal processing provides speaker protection.
■
Stereo Headphone Output
¼” stereo headphone jack located on front panel.
Installation and Initial Setup
Unpacking
Carefully unpack the AR-AM4 audio monitor and verify that the following items are included:
• AR-AM4 Audio Monitor
• Power Supply with 4-Pin XLR Connector (29VDC)
• AC Power Cable
• Operating Instructions
Inspect the unit for any physical damage that may have occurred during shipping. Should there be any damage,
immediately contact Marshall Electronics at (800) 800-6608. If you are not located within the continental United States,
call +1 (310) 333-0606.
Audio Monitor Installation
The AR-AM4 audio monitor can be installed in an EIA-standard 19-inch rack. At only 6” inches deep, the AR-AM4 can
also be installed in many shallow racks cases. Alternately, the AR-AM4 audio monitor can be placed on any level surface.
For optimum sound quality, the audio monitor should be installed at ear level.
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Quick Start Guide
1. Connect an Audio Source
Connect an audio source to any of the 4 pairs of rear panel input connectors. We recommend the use of the
Balanced XLR female connectors using a balanced audio signal with a nominal level of +4dBu.
2. Power On the Audio Monitor
Supply power to the audio monitor by connecting the included power supply to an AC power source (100-240 V @
50/60 Hz) and connecting the power supply’s 4-pin XLR connector to the back of the audio monitor. The Power LED
on the front panel will illuminate green.
3. Select Input Channel
Use the Input Select controls to choose one of the four inputs.
4. Adjust the Volume and Balance
Use the Volume and Balance controls to adjust the sound level and stereo balance.
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Front Panel Features
Stereo Loudspeakers
The stereo loudspeakers are always active
regardless of connected headphones.
Power Indication LED
The power LED will illuminate green when power is
supplied to the audio monitor.
Headphone Output
The headphone output accepts stereo headphones
with a 1/4" TRS connecter.
Headphone Volume Control
The headphone volume control affects only the stereo
headphone jack.
Input Select
Rotate knob to switch between input channels 1
through 4.
Master Volume Control
The master volume control affects only the stereo
speakers.
Balance Control
The balance control adjusts the relative level of each
left and right input to the speakers and headphones.
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Rear Panel Features
Power Input Connector
Use only the included power supply to power the AR-AM4 audio monitor.
Audio Outputs
XLR- 3pin male connector. Balanced audio out is same level as XLR audio input. This is an active output from the
selected Audio Input.
Audio Inputs
XLR - 3pin female connector. Balanced audio in. Pin 1= ground, Pin 2= Signal +, Pin 3= Signal -
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Basic Operation
Overview
Basic operation of the AR-AM4 Audio Monitor involves connecting audio sources, and monitoring through the stereo
speakers.
The user can choose between listening to the amplified internal speakers, or headphones. Audio volume can be adjusted
from front panel controls.
There are four (4) separate stereo input channels. One can be selected at any time from the front panel.
Controls
■ Volume Control
The VOLUME control affects only the stereo speakers.
■ Channel Select
The Channel Select controls which of the four inputs is selected to the speakers, headphones and rear XLR Outputs.
■ Balance Control
The BALANCE control adjusts the relative levels of the LEFT and RIGHT channels of the input, affecting both the
stereo speakers and headphone output.
■ Headphone Output
The headphone output accepts standard stereo headphones with a 1/4" TRS connector. Headphones with an 1/8”
(3.5mm) mini-plug connector may be used with an adapter. NOTE: The stereo speakers are NOT muted when a
connector is plugged into the headphone output. Headphones are not included with this unit.
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Specifications
AR-AM4 Audio Monitor
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ACOUSTIC
Speaker Power Output: Left/Right RMS @ 4Ω: 3W RMS, 5W Peak
Peak Acoustic Output: 99 dB SPL @ .1m
Headphone Power Output: 150 mW
■
ELECTRICAL
Power Consumption: 40W
Voltage Requirement: 29VDC
Included Power Supply
AC Input: 100V-240V, 1.0A, 50-60Hz
DC Output: 29VDC, 1.65A,
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MECHANICAL
Dimensions (w x h x d): 19.0” x 1.75” x 6.0”
Rack Height: 1 RU
Weight: 4.55 lbs. (2 kg)
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Input / Output
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ANALOG STEREO INPUT (x 4)
XLR 3-pin Female
■
ANALOG STEREO OUTPUT (Selected)
Outputs: 2 x Analog (Balanced XLR)
Reference: Active balanced from selected Audio Input
+4dBu nominal level (balanced differential)
Specifications (continued)
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Marshall Electronics
, Inc.
Warranty
Marshall Electronics warranties to the first consumer that this AR-AM4 Audio Monitor will, under normal use, be free from
defects in workmanship and materials, when received in its original container, for a period of one year from the purchase
date. This warranty is extended to the first consumer only, and proof of purchase is necessary to honor the warranty. If
there is no proof of purchase provided with a warranty claim, Marshall Electronics reserves the right not to honor the
warranty set forth above. Therefore, labor and parts may be charged to the consumer. This warranty does not apply to the
product exterior or cosmetics. Misuse, abnormal handling, alterations or modifications in design or construction void this
warranty. No sales personnel of the seller or any other person is authorized to make any warranties other than those
described above, or to extend the duration of any warranties on behalf of Marshall Electronics, beyond the time period
described above. Due to constant effort to improve products and product features, specifications may change without
notice.
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1910 East Maple Ave.
El Segundo, CA 90245
Tel: (800) 800-6608 / (310) 333-0606 • Fax: 310-333-0688
www.LCDRacks.com • sales@lcdracks.com
2009-0316
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