Shure AMS4000 Installer Manual
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Shure AMS4000 Installer Manual

Shure AMS4000 Installer Manual

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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 2 0 0
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 2 0 0
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 for Shure AMS4000

  • Page 1 ... 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. Printed in U.S.A. OCopyr~ght 1997, Shure Brothers lncorporated U.S.

  • Page 2: Table Of Contents

    ..........Appendix II: Theory of the Shure Automatic Microphone System .

  • Page 3: Specifications

    AMS8000: 6.6 kg [I 4 Ib 8 oz] ring of Headphones output, and negative voltage on tip of AMS4000: 5 . 8 kg [ I 2 Ib 1 3 oz] Direct output. Aux output is in phase with Aux input.

  • Page 4: Connections. Controls And Indicators

    [See sections on Link Jacks and on Theory of either four or eight microphone inputs per unit. The Operation for further Information on Off-Attenuation.] microphone inputs are designed for use only with Shure AMS microphones; the Mixer will not operate with other 8 . Power Cord: A 3-conductor cord and grounded plug microphones;...
  • Page 5 LineIMic, Aux, and Phones outputs approach clipping. If gates the channel off. The channel output drops to the this light flashes on, turn down the Microphone Channel level set by the Off-Attenuation switch. The Mute func- controls of the channels in use or turn down the tion dominates Override when both are simultaneously Master control until the light stays out.

  • Page 6: Microphoneplacement

    Use as few microphones as necessary to pick up everyone. linked mlxers, connect the Channel 8 Logic Ground ter- The closer the microphones are to their sound sources, the minals of each unit together. Switching clicks may greater the loudness of the sound system before feedback result if thts is not done.

  • Page 7: Logicfunctions

    A L T A R MUTING SWITCH CHAIRPERSON*^ CHANNEL RECORDER CHURCH SETUP FIGURE 6 LEGISLATURE SETUP FIGURE LOGIC FUNCTIONS Cough Button The user can turn off his her microphone [to the selected Off-Attenuation level] during coughing or private conversa- tions. To establish this function, wire an SPST pushbutton switch between the Mute In and Logic Ground terminals on each channel requiring a cough button.

  • Page 8: Chairperson-Controlled Muting

    Loudspeaker Muting In some applications, a loudspeaker is located near each talker to provide audio reinforcement or t o allow monitoring GATE OUT of a telephone conversation or conference. Each LOGIC GROUND loudspeaker can cause feedback unless i t is automatically switched off whenever the talker near i t speaks.

  • Page 9: General

    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 change has been made. GATE OUT LOGlC GROUND Preventing Room Noise Modulation M U T E IN This connection keeps at least one microphone on to O V E R R I D E IN eliminate varying background noise or "pumping"...

  • Page 10: 15-Voltcmos

    [If the receiver has only a balanced line-level output, the same connections can be made, but a line at- (AUX/HIZ LEVEL) tenuator such as Shure's A15LA should be used in the receiver-mixer line.] POWER SUPPLY The wireless microphone can be switched on and off re-...

  • Page 11: Operatinghints

    DC R E S I S T A N C E (f 20%) ' 1 4 (31: 2 N 5 2 1 0 Shure A95UF o r 9 0 A 8 0 3 2 P I - P 3 75 OHMS S1-S2...
  • Page 12 2 seconds as follows. 1 . With the top cover removed, locate the Master board [A21. 2. For AMS4000 mixers, no further disassembly is necessary; for AMS8000 mixers, remove the Channel 8 board as described above.
  • Page 13 The modification is required for the "Filibuster" ing transformer [Shure A95U or equivalent]. The mode previously described, and for any logic terminal use re- nominal level then becomes -48 dBV [ 4 mV].
  • Page 14 AMS4000: Input Expansion all Channel boards [unused channels will have unused Model AMS4000 mixers, supplied with four input channels, connectors]. can be expanded t o accommodate up to eight AMS 9 . Attach the new Channel Level control knob and replace microphones through the installation of additional Channel the cover.

  • Page 15: Troubleshooting

    PC board assemblies, or return the unit to the Shure Service Department for repair; if there is still no sound, check cable. To check cable: replace suspect cable with another. If there is sound, repair or discard defective cable;...

  • Page 16: Appendix I: Effects Of Acoustic Environment On Gating

    A solution to these problems is t o gate on only the The less reverberant the room, the farther the talker can microphone or microphones immediately in use. The Shure be from the microphone before gating becomes erratic. AMS does this effectively and reliably by gating an individual...
  • Page 17 AMS mixer phase relationships among the sound fields at the channel. For instance, Shure's SM85 will operate; however, microphones. The approximation is valid for a large number the microphone's clipping level is significantly reduced because the powering voltage is lower than the minimum of microphones, but not for just a few.
  • Page 19 MODELS AMS4000AND A M S 8 0 0 0 FRONT PANEL O F F - A T T E N " o L o k i ; a O m 0 GATE OUT LOGIC GND L I N E OUTPUT MUTE I N OVERRIDE I N MODELS A M S 4 0 0 0 AND A M S 8 0 0 0...
  • Page 20 The Sound of Professionals Worldwidem Shure Brothers Incorporated Hartrey Avenue Evanston, IL 60202-3696 U.S.A.

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