Shure A15AS User Guide

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 Ω) 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.

©2006, Shure Incorporated
27C1915 (Rev. 6)

Printed in U.S.A.

SPECIFICATIONS

Frequency Response

Flat, 20 to 20,000 Hz ± 0.5 dB

Impedance

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

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 Ω; this resistance should be considered in addition to any
existing circuit resistance when using the attenuator.