Shure A15AS User Manual

Model A15AS

User Guide

MODEL A15AS SWITCHABLE IN-LINE ATTENUATOR

Use this balanced-line attenuator to prevent low-impedance
microphones (rated at 150 or 600 ) and high-output condenser
microphones from overloading low impedance inputs in high
sound pressure level applications. The values of attenuation can
be switch-selected for 15, 20, or 25 dB.

Use the A15AS with any low-impedance microphone, including
phantom-powered condenser microphones, such as the Shure
SM81. It can be used in-line between the microphone and its
power supply. (This model is not suitable for use with the
condenser powering system called “A-B Powering.”)

The A15AS attenuator bridges the microphone output and
allows maximum signal handling with a minimum of loading­caused distortion or reduction in clipping level.

©2009 Shure Incorporated
27C1915 (Rev. 7)

Printed in U.S.A.

SPECIFICATIONS

Frequency Response

Flat, 20 to 20,000 Hz 0.5 dB

Impedance

Input (XLR Female): 1,000 
Output (XLR Male): 150 

Attenuation (switch selectable)

15 dB, 20 dB, or 25 dB

Case

Full magnetic shield; steel with gray enamel finish

Dimensions

19 mm (3/4 in.) diameter; 114 mm (4 1/2 in.) long

NOTE: The equivalent single series simplex-powering resistance
is 215 ; this resistance should be considered in addition to any
existing circuit resistance when using the attenuator.