Shure AMS28, AMS26, AMS24, AMS22 manual AMS Condenser Microphones User Guide

AMS Condenser Microphones User Guide

AMS24

AMS22

GENERAL

AMS Series Condenser Microphones function as part of the Shure Automatic Microphone System (AMS). AMS is a propri- etary system that lowers background noise by automatically mut- ing microphones when they are not in use. It offers superior perfor- mance because it uses both the loudness and direction of the intended talker. This system is ideal for applications such as con- ference rooms, legislatures, churches, courtrooms, broadcast studios, and distance learning classrooms.

CAUTION

Only use AMS microphones with AMS mixers.

Connecting the microphone to other types of mixers or inputs may damage the microphone.

IMPORTANT

Acoustical reflection from vertical and horizontal surfaces to the rear or sides of the microphone inhibits proper gating.

•Place the microphone at least 1 meter (3 ft) from the wall behind it, and at least 0.3 meters (1 ft) in front of any bulky objects.

•For AMS24 and AMS26 microphones, the grille must be at least 203 mm (8 in.) above any horizontal surface.

•For the AMS28, the microphone must be kept at least 76 mm (3 in.) away from any solid surface (table top or edge).

HOW AMS WORKS

Each AMS microphone contains two unidirectional cartridges. One cartridge faces forward, towards the talker, and the other faces in the opposite direction, away from the talker. The AMS mixer gates the microphone while it continuously compares the relative signal levels from each cartridge. Whenever the signal from the front cartridge exceeds that of the rear cartridge by 9 dB or more, the mixer opens the gate and allows signal from the front cartridge to pass through the system. At all other times, the mixer gate remains closed.

AMS26

FRONTREAR

CARTRIDGECARTRIDGE

AMS MICROPHONE DESIGN

Figure 1

AMS26 AMS28

MODEL VARIATIONS

AMS 22 Boundary microphone

Low-profile, boundary microphone for installation on flat sur- faces such as tables, desks, and lecterns. Operates like a hemi- or half-cardioid microphone because half the cardioid pattern ªdisap- pearsº when the microphone is placed on a surface.

•Low vibration and hum sensitivity

•Hemi-cardioid polar pattern

•Low profile design is unobtrusive on conference tables

•Surface mounting eliminates comb-filter effects due to surface reflections, allowing smoother frequency response

AMS24 Gooseneck Microphone

The AMS24 microphone is attached to a thin, flexible 381

mm(15 in.) gooseneck that is designed to be mounted to con- ference tables, desks, and lecterns.

• Low vibration and hum sensitivity

• Frequency response tailored for voice

• Cardioid polar pattern

• Pop-filter grille reduces sensitivity to explosive breath sounds

AMS26 Probe Microphone

The AMS26 Microphone is a probe style unit designed for desk or floor stand mounting. It is supplied with a Shure A57F Swivel Adapter.

•Low vibration and hum sensitivity

•Frequency response tailored for voice

•Cardioid polar pattern

•Pop-filter grille reduces sensitivity to explosive breath sounds

•Mounts on desk stand, floor stand or gooseneck

AMS28 Lavalier Microphone

The AMS28 microphone is designed for chest-worn operation and is supplied with a matching lavalier assembly.

•Low vibration and hum sensitivity

•Frequency response tailored for voice

•Cardioid polar pattern

•Acoustically optimized for chest-worn operation

•Extremely flexible long-life cable

2001, Shure Incorporated

27B3097 (AC)

Printed in U.S.A.