Shure A15AS — In-Line Switchable Attenuator
A15AS Overview
The Shure A15AS is a passive in-line attenuator built for professional audio applications where signal levels must be precisely managed before reaching a mixer or recorder input. It accommodates both balanced microphone and line-level signals, offering switchable attenuation of 15, 20, or 25 dB via a three-position slide switch. The unit is particularly well-suited for high-SPL environments where a high-output microphone risks overloading a mixer’s mic input, and it can also reduce a line-level mixer output to aux-level for recorder inputs. System integrators, broadcast engineers, and live sound professionals will find it a reliable, compact solution for gain-structure management in the signal chain.
The A15AS passes phantom power from the mixer through to the microphone, making it fully compatible with condenser microphones without requiring any additional power provisions.
Key Features
- Switchable Attenuation — Three-position slide switch selects 15, 20, or 25 dB of signal reduction to suit varying input sensitivity requirements
- Balanced Signal Compatibility — Works with both balanced microphone-level and line-level signals for broad application flexibility
- Phantom Power Pass-Through — Passes 48V phantom power from mixer to microphone, maintaining full compatibility with condenser microphones
- Female XLR Input / Male XLR Output — Standard 3-pin XLR connectors on both ends integrate directly into any professional balanced signal chain
- High-SPL Application Suitability — Prevents input overload on mixer or recorder mic inputs when using high-output microphones in loud environments
- Line-to-Aux Level Reduction — Reduces line-level mixer output to aux-level for recorders with lower-sensitivity inputs
- Compact In-Line Form Factor — Installs directly in the cable run with no additional mounting or housing required
Connectivity & I/O
- Input: Female 3-pin XLR connector (balanced)
- Output: Male 3-pin XLR connector (balanced)
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