Shure A15AS User manual
GUARANTEE
This Shure product is guaranteed in normal use to be free from
electrical and mechanical defects for a period of one year from
date of purchase. Please retain proof of purchase date. This guar-
antee includes all parts and labor, and is in lieu of any and all other
guarantees or warranties, express or implied. There shall be no re-
covery for any consequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit, have it insured, and return it prepaid to:
Shure Incorporated
Attention: Service Department
222 Hartrey Avenue
Evanston, IL 60202-3696
If outside the U.S.A, return the unit to your dealer or Authorized
Shure Service Center for repair. The unit will be returned to you
prepaid.
Model A15AS
User Guide
MODEL A15AS SWITCHABLE IN-LINE ATTENUATOR
This balanced-line attenuator can be used whenever the output
level of a low-impedance (rated at 150 or 600 Ω) microphone
overloads a low-impedance input. The values of attenuation can
be switch selected for 15, 20, or 25 dB.
The attenuator is optimized for use with phantom powered con-
denser microphones like the Shure Model SM81; and it can be
used in the line between the microphone and its power supply.
The A15AS is also ideal for use with any low-impedance dynamic
microphone. (This model is not suitable for use with the condens-
er powering system called “A-B Powering.”)
27B1915 (TL)
2000, Shure Incorporated Printed in Mexico
The A15AS attenuator operates by, in effect, bridging the micro-
phone output and allowing maximum signal handling with mini-
mum loading-caused distortion or reduction in clipping level.
Thus high-output condenser microphones or low-impedance dy-
namic microphones used at very high sound pressure levels can
be connected to ordinary low-impedance inputs with appropriate
attenuation for each application.
The impedance at the input end (three-socket connector*) of the
A15AS is 1,000 Ω; the impedance at the output end (three-pin
connector*) is 150 Ω. The equivalent single series simplex-pow-
ering resistance is 215 Ω; this resistance should be considered
in addition to any existing circuit resistance when using the atten-
uator.
*Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) se-
ries, or equivalent.
SPECIFICATIONS
Frequency Response
Flat, 20 to 20,000 Hz 0.5 dB
Impedance
Input: 1,000 Ω
Output: 150 Ω
Attenuation (switch selectable)
15 dB, 20 dB, or 25 dB
Case
Full magnetic shield; steel with gray enamel finish
Dimensions
19 mm (3/4in.) diameter; 114 mm (4 1/2in.) long
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