Shure AMS4000 Specifications

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Shure Brothers lncorporated
222 Hartrey Avenue
Evanston,
IL
60202-3696 U.S.A.
AMS4000 AND AMS8000 Installer's Manual
The Shure Automatic Microphone System [AMS] turns
microphones on and off [with automatic gating], greatly
reducing the reverberant sound quality and feedback prob-
lems often associated with the use of multiple microphones.
The special AMS microphones are gated on only by sounds
arriving from the front within their acceptance angle of
1
20°. Other sounds outside the 120° angle, including
background noise, will not gate the microphones on, regard-
less of level. In addition, the AMS adjusts gain automatically
to prevent feedback as the number of "on" microphones
increases.
The resulting sound is clearer than that of conventional
multiple microphone speech reinforcement and recording
systems-and free of the clipped and missed words, clicks
and pops, and noise pumping often associated with other
"automatic mixer" systems. Besides its major advantages
of simple setup and unmanned operation, the Automatic
Microphone System operates over an extremely wide
dynamic range without the possibility of threshold-setting
misadjustments.
AMS Mixers are supplied in 4- and
Schannel configura-
tions [Models
AMS4000 and AMS80001, each housed in a
single
3lh-inch rack-mount package. Both contain logic ter-
minals [for channel muting, override functions, and gating in-
dications], and link circuitry for expansion to as many as 200
linked channels.
AMS
Features:
w
Reliable, quick-acting, noise-free gating-virtually insens-
itive to changes in sound source loudness or distance
w
Smooth pleasant-sounding turnon and turnoff
characteristics
w
No threshold settings to misadjust
w
Front-panel microphone channel gain controls and
Master control operate as in conventional mixers
w
Selectable hold time keeps microphones on during short
pauses
w
Preset or adjustable Off-Attenuation control for unob-
trusive gating
Automatic gain adjustment as additional microphones
gate on
w
Wide, flat frequency response and low distortion up to
+
18
dBm output
w
Logic inputs and outputs enhance system versatility
w
Linking capability for systems of as many as 200
microphones and 25 mixers
LED indication of gating operation and output level
w
Automatic muting prevents annoying thumps and
loudspeaker damage when unit is turned on and off
w
Four or eight special microphone inputs [for use
only
with
AMS microphones] use standard two-conductor shielded
cables and three-pin connectors
w
Balanced output switchable to line or microphone level
w
Front- and rear-panel unbalanced Aux inputs and outputs
w
Front-panel headphone monitor jack
w
Direct [non-gated] outputs available from individual
microphones
w
Underwriters Laboratories Listed and Canadian Stan-
dards Association listed as Certified
.....
-
......
-.
Shure AMS4000 and AMS8000 Mixers are designed for use only with Shure AMS Condenser Microphones. Conventional condenser or
other microphones will not operate properly with the
AMS4000 and AMS8000.
-
OCopyr~ght 1997, Shure Brothers lncorporated
27A8273(QC)
Printed in U.S.A.
U.S. Patent 4,489,442; other patents pending
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Summary of Contents

Page 1 - Features:

Shure Brothers lncorporated 222 Hartrey Avenue Evanston, IL 60202-3696 U.S.A. AMS4000 AND AMS8000 Installer's Manual The Shure Automatic Microp

Page 2 - TABLE OF CONTENTS

15-Volt CMOS The logic terminals can be used with 15-volt CMOS if a pull- up resistor is used with each Gate output [see Figure 191. LOGIC GROUND I G

Page 3 - SPECIFICATIONS

microphone features: it will not sense ambient room noise, gating will not be direction-sensitive, and gating threshold adjustment will be necessary

Page 4 - "0"

I WARNING I No user-serviceable parts inside. Refer all ser- vicing, including modifications, to qualified ser- vice personnel. AMS mixers can b

Page 5 - MUTE IN

Channel board near integrated circuit U105 [see Figure 271. 3. ~nsolder the jumper at XI 04 and solder it or a new jumper in the holes of XI 03. 4

Page 6 - Switching

are the two terminals on the opposite side of the jack body from RlOl and R104.] Wiring can be made at the top [component] side of the board, or

Page 7 - RECORDER

TROUBLESHOOTING To Diagnose or Correct Make indicated correction. Listen to headphones plugged into the AMS front-panel Phones jack. To check microp

Page 8 - FILIBUSTER"

EFFECTS OF ACOUSTIC ENVIRONMENT ON GATING Room Noise: The louder the room noise, the greater the talker's sound pressure level must be at the mic

Page 9 - 'I7

With a single microphone fully "on", the increase in system gain due to incomplete attenuation in the "off microphones is given by: W

Page 11 - OVERRIDE IN

MODELS AMS4000AND AMS8000 FRONT PANEL I OFF-ATTEN "oLoki;a o 0.5 SEC 1.0 Om0 LINE MIC OUTPUT MODELS AMS4000 AND AMS8000 REAR PANEL 8 .. GATE OU

Page 12 - "Live"

TABLE OF CONTENTS General ... 1 Specifications ...

Page 13 - BEFORE AFTER

The Sound of Professionals ... Worldwidem Shure Brothers Incorporated 222 Hartrey Avenue Evanston, IL 60202-3696 U.S.A.

Page 14 - "2"

SPECIFICATIONS Output Level [at full galn, 1 kHz, one channel gated On, Off-Atten at -1 5, wlth AMS26 probe mtcrophone, output terrnlnatlons: Lln

Page 15

CONNECTIONS, CONTROLS, AND INDICATORS [Paragraph numbers that follow refer to pictorial views on inside back cover .] 1. Microphones: The Shure AMS

Page 16 - APPENDIX

LineIMic, Aux, and Phones outputs approach clipping. If this light flashes on, turn down the Microphone Channel controls of the channels in use

Page 17

linked mlxers, connect the Channel 8 Logic Ground ter- minals of each unit together. Switching clicks may result if thts is not done. When mixers

Page 18

ALTAR ma RECORDER CHURCH SETUP FIGURE 6 r*i PLAYER $GK-~ COURTROOM SETUP FIGURE 7 minals of the linked mixers are connected. One mixer feeds a PA sys

Page 19 - REAR PANEL

0 / GATE OUT 0 LOGIC GROUND 01 MUTE IN OVERRIDE IN CcHAIRPERsoN7.s CHANNEL Loudspeaker Muting In some applications, a loudspeaker is located n

Page 20 - 60202-3696 U.S.A

NOTE: To prevent high-frequency oscillation, do not wire a channel's Gate Out terminal to its own Mute In terminal until the Mute to Inhibit cha

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