Shure A15AS - Manual
A user manual for the Shure Model A15AS Switchable In-Line Attenuator is designed to help users understand its role in managing signal levels between condenser microphones and audio interfaces. This device primarily addresses compatibility concerns by providing adjustable attenuation (15–25 dB) to prevent distortion when connecting high-output mics to low-impedance inputs, making it essential for professional audio setups. Its technical specifications highlight its flat frequency response (20–20 kHz), robust magnetic shielding, and precise impedance matching (1 kΩ input, 150 Ω output). The manual also clarifies its intended use with phantom-powered condenser mics while excluding applications requiring "A-B Powering."
Table of Contents:
- Page 1 – Switchable In-Line Attenuator Operation
- Page 2 – Technical Specifications and Dimensions
- Page 3 – Limited Warranty Terms
- Page 4 – Contact Information
©2009 Shure Incorporated
27C1915 (Rev. 7)
Model
A15AS
User Guide
Printed in U.S.A.
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 loading-
caused distortion or reduction in clipping level.
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About this manual
- Brand
- Shure
- Model
- A15AS
- Document type
- Manual
- Language(s)
- English
- Pages
- 4
- File size
- 133.5 KB
- Format
Summary
Guidance on preventing overloading of low-impedance inputs by high-output condenser microphones, and switching attenuation levels (15, 20, or 25 dB) for signal handling.
Details regarding frequency response, impedance values, selectable attenuation settings, physical dimensions, case construction materials, and equivalent power resistance for circuit design.
Conditions for warranty claims, exclusions related to abuse or unauthorized repairs, disclaimer of implied warranties, limitation of liability, and warranty supersedence clauses.
