SHURE A15AS A15AS In-line Switchable Attenuator


Switchable in-line attenuator reduces the level of balanced microphone or line-level signal by 15, 20, or 25 dB.

SKU: A15AS Categories: , , Tag:


General Description

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.


Frequency Response

20 to 20,000 Hz ±0.5 dB


Input 1,000 Ω
Output 150 Ω

Attenuation Switch


15 dB, 20 dB, 25 dB


Full magnetic shield; steel with gray enamel finish


19 mm (.75 in.) diameter; 114 mm (4.5 in.) long

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.