Clear-Com ENCORE AMS-1027 Instruction Manual
CLEAR-COM ENCORE
AMS-1027 AMPLIFIED MONITOR SPEAKER
INSTRUCTION MANUAL
AMS-1027 Amplified Monitor Speaker Instruction Manual
© 2007 Vitec Group Communications Ltd. All rights reserved.
Part Number 810284Z Rev. 1
Vitec Group Communications, LLC.
850 Marina Village Parkway
Alameda, CA 94501
U.S.A
Vitec Group Communications
7400 Beach Drive
Cambridge Research Park
Cambridgeshire
United Kingdom
CB25 9TP
Vitec Group Communications
Room 1806, Hua Bin Building
No. 8 Yong An Dong Li
Jian Guo Men Wai Ave
Chao Yang District
Beijing, P.R. China 100022
® Clear-Com, CellCom/FreeSpeak and the Clear-Com Communication Systems logo are registered trademarks of The Vitec Group
plc.
CONTENTS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Radio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Television/Video Postproduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Commercial Industrial Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Audio Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Front Panel Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Internal Speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Audio Level Bargraph Meter Displays. . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Power Indicator LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Headphone Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Balance Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Rear Panel Connectors and Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
XLR Connectors for Balanced Inputs and Loop-Through on Channels A
and B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Input Gain/VU Meter Level Adjust for Channels A and B . . . . . . . . . . 1-5
RCA Connectors for Unbalanced Inputs on Channels A and B . . . . . . 1-6
Vol/Bal to A-Vol/B-Vol Retrofit Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Sympathetic Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Mechanical Bracing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Audio Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Electrical Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
General Mechanical Observations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
General Audio Circuitry Observations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
General Level Meter and Level Gain Calibration Observations . . . . . . . . . . . 3-2
Audio Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Input Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Volume Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
AMS-1027 AMPLIFIED SPEAKER STATION
i
Limiting Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Headphone and Speakers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
AMS-1027 Interconnect Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Left and Right Meter Driver PCA Component Layout Drawings . . . . . . . . . 3-5
AMS-1027 Left and Right Meter Driver PCA Schematic . . . . . . . . . . . . . . . 3-6
AMS-1027 Main Audio PCA Component Layout Drawing . . . . . . . . . . . . . 3-7
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
AMS-1027 Amplified Speaker Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-I
Warranty Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Non-Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
Liability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
ii
AMS-1027 AMPLIFIED SPEAKER STATION
Please read and follow these
instructions before operating
this product.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long
periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
15. WA RN I NG : To reduce the risk of fire or electric shock, do not expose this
product to rain or moisture.
AMS-1027 AMPLIFIED MONITOR SPEAKER
Please familiarize yourself with the safety symbols in Figure 1. When you see
these symbols on this product, they warn you of the potential danger of electric
shock if the main station is used improperly. They also refer you to important
operating and maintenance instructions in the manual.
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.
This symbol informs you that important operating and maintenance instructions are included in the literature accompanying
this product.
Figure 1: Safety Symbols
iv
AMS-1027 AMPLIFIED MONITOR SPEAKER
1
OPERATION
Thank you for choosing the Clear-Com AMS-1027 Amplified Speaker Station.
For optimum results, please read this entire manual before installing your
AMS-1027 station.
The AMS-1027 is a bi-amplified, self-contained, rack-mountable audio monitor
speaker that occupies only a single rack space.
This amplified speaker station features exceptional audio quality, very low
distortion, and high output power. It provides convenient, powerful,
high-quality audio monitoring capability in locations where few other monitor
speakers can fit. The specially designed 2-way speaker system will reach output
levels of 96 dB SPL at 2 feet (0.6m) without audible distortion.
The AMS-1027’s design
provides high-quality audio
monitoring, even in
high-noise environments.
The steel enclosure is magnetically shielded, allowing the speaker station to be
placed above or below a television monitor without affecting the monitor’s color
balance. Equipped with electronically balanced 3-pin XLR inputs or unbalanced
line-level RCA inputs, the AMS-1027 enables you to easily monitor a variety of
audio sources. Its input limiter minimizes speaker distortion, and separate
channel volume controls allow easy adjustment of stereo signals or two discrete
monophonic signals. The AMS-1027 has two multi-segment, LED bar-type level
displays, adjustable from the rear panel.
To achieve the extended bass response produced by the AMS-1027, the
low-frequency signals from both channels are summed into a single bass
amplifier. This amplifier drives a specially developed, baffled loudspeaker, which
is centered in the unit. The mid/high frequency drivers are mounted at opposite
ends of the AMS-1027, providing the maximum amount of stereo image
separation possible.
The Clear-Com AMS-1027 Amplified Speaker Station is a valuable accessory in
a wide variety of facilities and installations, particularly where rack space is at a
premium.
DESCRIPTION
The single-rackspace AMS-1027 permits convenient monitoring of one stereo or
two monophonic (“mono”) analog input sources, with excellent full-range
fidelity.
AMS-1027 AMPLIFIED SPEAKER STATION
Two front-firing midrange-tweeter speakers and a compact high-performance
woofer are arranged in an efficient bi-amp design. The summed bass feature is
important for audible detection of “out of phase” conditions. Speaker amp
limiters prevent accidental damage to speakers from high input levels.
Front-panel volume and balance controls are standard, but can be re-configured
in the field as A volume/B volume. Ten-segment LED bargraph meters with
rear-panel input calibration provide an indication of input levels. Balanced
1-1
inputs are on XLR connectors, with unbalanced inputs on RCA connectors.
Passive loop-through XLRs are also provided.
The AMS-1027 is completely magnetically shielded to allow interference-free
operation immediately adjacent to all CRT video monitors. Its lighter weight and
shallower-depth chassis (compared to similar-type units) makes it ideal for use in
portable and mobile vehicle applications.
Figure 1-1: AMS-1027 Amplified Speaker Station
1-2
Figure 1-2: Interior of AMS-1027 Unit
FEATURES
• Selectable monitoring of one stereo analog signal in one unit
• Although only one rack space high, the AMS-1027 produces 96 dB SPL at 2
feet
• Volume/Balance controls are standard, internally configurable as
A-volume/B-volume
• 10-segment level meters
• Headphone jack with speaker muting
• Accepts both balanced (XLR) and unbalanced (RCA) inputs
• XLR loop-through connectors
• Blowout-proof speakers
• Lightweight and shallow-depth chassis
AMS-1027 AMPLIFIED SPEAKER STATION
• Internal universal AC mains power supply
• Thoroughly magnetically shielded
APPLICATIONS
Radio
Monitoring incoming and outgoing feeds
Television/Video Postproduction
• Confidence/cuing monitoring for all types of ATRs and VTRs in machine
rooms and edit bays
• Monitoring network and transmitter feeds
• ENG, SNG and other OB vehicles and EFP systems
Commercial Industrial Sound
Monitoring audio feeds in theme parks, security installations, and
teleconferencing systems
AUDIO CIRCUIT
The AMS-1027’s popular bi-amp design provides high-quality audio
reproduction, ideal for monitoring even in high noise environments. The two
front-firing midrange-tweeter speakers and compact high-performance woofer,
along with the summed bass feature, offer accurate sound reproduction and
audible detection of “out of phase” conditions. Damage to speakers from high
input levels are prevented by using in-circuit limiters.
For more detailed information, see the audio circuit description and the
interconnect block diagram in the Maintenance Chapter of this manual.
FRONT PANEL CONTROLS AND INDICATORS
Please refer to Figure 1-3 to familiarize yourself with the AMS-1027’s front-panel
controls and indicators. The following sections describe the functions of each of
the various controls and indicators found on the front panel and are referenced,
by number, to Figure 1-3.
Amplified
Monitor Speaker
AMS-1027
3
1
2
4
5
1
Figure 1-3: Front Panel of AMS-1027
63 1
AMS-1027 AMPLIFIED SPEAKER STATION
1-3
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