Shure AMS4000 Manual de usuario

SHURE AUTOMATIC MICROPHONE SYSTEM

222

HARTREY AVENUE

SMUi;UEB

EVANSTON. lLLlNols

60202-3896

U.6.A

THE

SOUND

THE

PROCESS-0

\VORlAWOE

MICROPHONES

AND

ELECTRONIC

COMPONENTS

OPERATING INSTRUCTIONS

DATA

SHEET

AMS4000 AND AMS8000

The Shure Automatic Microphone System consists of the

AMS8000 [or AMS4000J Mixer used with Shure AMS

Microphones. This system's excellent performance, ver-

satility, and ease of use make itan idealchoice for multiple-

microphone public-address and recording systems such as

used in conference rooms, legislatures, churches, court-

rooms, broadcast studios, teleconferences, and panel

discussions.

The Shure Automatic Microphone System solves many

problemsassociatedwith multiple-microphone installations,

such as boomy or muddy sound, insufficient sound level

because of feedback [howling), and operator errors.

does

this by turningononly those microphonesinuse, thus keep-

ingthe number of "on" microphonestoaminimum.Whena

personspeaks infront of hismicrophone[within60° of each

side of the front), the microphoneturns on. Sounds origina-

tingatthe sides or rearof the microphonewill notturniton.

In addition, the system automaticallyreduces itsvolume as

the number of "on" microphones increases, thereby

preventingfeedback.

The Shure AMS also solves problems encountered with

other automatic mixers such as complicatedsetup adjust-

ments, unreliable turn-an, and choppy sound. The micro-

phones turn on smoothly and dependably, free of pops or

clicks, and virtually independent of talker loudness or

distance.

You'll find the Shure Automatic MicrophoneSystem simple

to install and operate, requiringlittle more adjustmentthan

an ordinary PA system. However, the system canalso per-

form a varietyof sophisticatedfunctions. ModelAMS8000

has eight microphone inputs; Model AMS4000 has four

microphone inputs.

IMPORTANT

ShureAMS4000 and AMS8000 Mixersaredesignedfor useonly with ShureAMSCondenser Microphones.Con-

ventional condenser or other microphones will not operate properly with the AMS4000 and AMS8000.

Inc

27A8272

[KJ)

Printedin U.S.A.

U.S. Patent 4,489,442; other patents pending

BASICSETUP:

THE AMS BACK PANEL

PLAYER

Thefollowinginstructionsarefor typical applications, installations and operation. Refertothe

Installers Manualfor further information.

TYPICAL CONNECTIONS

WHAT TO

HOW TO DO IT

POWER

AMPL

Connect the power cord. 1.Makesure the front panelpower switch isoff.The unit is

factory-wired for operation at 120

Vac, 50160

Hz.

LINE

2. Connect the AMS microphones.

IN AMS MIXER

2. Use only Shure AMS Microphones. When extension

cables areneeded, use conventional2conductor shielded

microphone cables.

OUT

AUX

3. Set the HoldTime switch.

Use the 0.5-second positionfor most applications.

Connectthe LinelMic or Aux Outputtothe

amplifier,

Use the Mixer Aux Output for connecting to phone or

tape recorder, or other system. phonojack aux or line inputs. Usethe LineIMicOutputfor

connectingto3-pin professionalbalanced inputs; set the

MicILineswitch as required.

OUT

Set the Off-Attenuationswitch. 5. Use the

-1

positionfor most applications.

REAR

PANEL

AUX

TAPE

RECORDER

BASIC

SETUP:

THE

MICROPHONES

AMS26

MICROPHONE

WHAT TO

LECTERN

MICROPHONE

HOW TO

6. Ingeneral, placethe talker within thefront acceptance

angle of the microphone.

Sound sources outside the shaded acceptance angle

will not turn on the microphone. See diagrams 6A

through 6D.

7A. If the chairs are

feet or less from each other, use

one microphone betweeneach pair of seats.

76. Ifchairsaremorethan

feetfromeachother, useone

microphone per seat.

Remove any objects immediately behind the

microphones that may reflect sound.

7A. Placeeach microphone afoot and a half fromthetable

edge, halfway betweenthe two seats [diagram 7A].

78.

Placeeach microphone afoot and ahalf from the table

edge, directly in front of the talker [diagram 781.

The grille of anAMS26 [probe] or AMS24[gooseneck]

microphoneshouldbe atleast

inchesabove any table-

top. [The A26X ExtensionTube inserted between the

swiveladapter and desk stand

will

raisethe AMS26 an

additional

Removeobjects behindAMS22 micro-

phones.

b3ORMORE

OPERATION:

ON THE FRONT PANEL

WHAT TO

HOW TO

Turn the Master volume control down.

Turn

fully counterclockwise.

Turn onthe power.

10.

Push in the AMS Power switch.

Adjust volume controls. 11. Set the individual volume controls to "5" for each

channelused. Set all unusedchannels tothe

"0"

posi-

tion.

Check each microphone channel. 12. Each channel's yellow indicator will light during speech

to show that the microphone turns on.

13. Set the Master volume control. 13. Turnupthe Masteruntiltheyellow Normallightflickers

during speech. If the red Overload light flashes, turn

down the Master untilthe redlight is out.

14.

Turn on the power amplifier, tape recorder, or other 14. Whileapersonistalkinginfront of themicrophone,set

system. the volume of the amp, etc., for the desiredresult. In

PA use, adjust for desiredloudness without feedback.

Some tape recordersrequirelower than normalAMS

Master settings toavoid distortion.

15. Make microphone levels equal. 15. Havesomeonetalk infront of each microphone. Adjust

the individualchannel controls for output equal tothat

of the first microphone, or for the desired loudness

without feedback.

FRONT PANEL

'@@pa

PHONES

MASTER

OPERATION:

ADDITIONAL OPTIONS

OPTION HOW TO DO IT

Adding pre-recordedmaterialtothe AMS output.. Connectthe aux [line] outputof the player

the Auxiliary

input [front or rear panel] of the AMS. Controlrecorder

volume with the Auxiliary control.

Recordingthe AMS output. Connectthe AMSAuxiliary output [front or rearpanel]to

a tape recorder aux or line input.

Recordingan individualchannel output. Connect the Direct Out from the desiredchannel to the

microphone input of a tape recorder. The Direct Out is

alwayson and isnotaffectedby any AMS Mixercontrols.

Listeningto the AMS output with headphones. Connect a mono or stereo headphone plug tothe Phones

jack.

TROUBLESHOOTING

NO SOUND: Check that the microphonesarepluggedinandthat the Masterand individualcontrols areturned up.

Sound from headphonespluggedintothe Phones jack indicatesthe problem is not in the AMS.

MICROPHONETURNS Check that the talker iswithin the

20° acceptanceangle of the microphone [diagram 61. Remove

ON ERRATICALLY OR any reflecting objects behind the microphone.AMS26 [probe] or AMS24 [gooseneck] only: Make

NOT AT ALL: sure that the microphone grille is at least

inches above the surface.

MICROPHONETURNS Move unwantedsource outside microphone acceptanceangle.

ON FOR UNWANT-

ED SOURCES:

DISTORTEDSOUND: If the red Overloadlight is flashing, turn down the Master untilthe light goes out. If loud talkers are

close to their microphones, turn their channel controls down. In general, the channel controls for

AMS22 [low-profile]microphonesshould be set lowerthanthosefor AMS26 [probe] microphonesin

order to obtain the same output volume. Some tape recorders may require lower AMS Master

settings to prevent distortion.

OTHER: If none of the above solutions solves your problem, consult your AMS sound installer or the

Troubleshooting sectionof the InstallersManual.

WHAT TO EXPECT FROMYOUR AUTOMATIC MICROPHONE SYSTEM

Microphoneturn-on

will

be reliable, fast, and smwth.There

will

be no clicks or clippedwords.

After long pauses inspeech, the microphones will smoothly fade toa lower volume level.

Whenthe first microphoneturns on, there will be a perceptiblerise in rwmnoise. There will be no further increasewhen

additionalmicrophonesturn on.

In many seating arrangements, several people will be within the acceptance angle of a microphone, so all will turn it on.

Papersrustlingmay also turna microphoneon; this will not affect the system's clarity becauseof the subtle way inwhich it

operates.

A personwithinthe acceptance angles of several microphoneswillturnthemall on. Again, this will notseriouslydegradethe

clarity of the system.

Innoisy or highly reverberant rooms, the acceptance angle will narrow slightly.For reliableturn-on inthesecircumstances,

talkers should be closer totheir microphones.

The Shure AMS will sound muchclearerthan

conventionalmulti-microphonesystem.

SOUND OF

THE

PROFESSIONALSm..

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