Shure A15HP High Pass Filter

Product Overview

The Shure A15HP is an in-line high-pass filter that rolls off low audio frequencies to reduce 60 Hz electrical hum and low-frequency noise from wind, air conditioning, and structural rumble. It inserts into a balanced microphone line so AV integrators can clean up problem low end at the source, before the signal reaches the mixer or DSP. This is a practical fix for conference rooms and houses of worship where HVAC airflow and building noise intrude on speech intelligibility.

Product Description

The A15HP attenuates content below the speech-critical range, which removes the low-frequency energy that masks dialogue and wastes headroom in a commercial AV system. Typical targets include 60 Hz hum coupled in from power wiring, the low rumble of air-conditioning systems, stage and floor vibration, and wind noise on microphones placed near vents. By filtering at the microphone line rather than relying solely on console EQ, the integrator preserves channel processing for other tasks and keeps the gain structure clean. The passive in-line design fits permanently installed systems and portable troubleshooting kits alike, and is especially useful where a microphone lacks its own low-cut switch or where additional roll-off is needed beyond what the microphone provides.

Key Features

• Low-Frequency Roll-Off — The filter attenuates low audio frequencies to cut rumble and free up headroom for clearer speech reproduction.
• 60 Hz Hum Reduction — It reduces 60 Hz electrical hum coupled into microphone lines from nearby power wiring.
• HVAC and Wind Noise Control — Rolling off low frequencies tames air-conditioner rumble and low-velocity wind noise common in commercial meeting spaces.
• In-Line Installation — It inserts directly into the balanced microphone line, filtering at the source without consuming a console EQ band.

Technical Specifications

Related in-line Shure accessories: the Shure A15AS attenuator and the Shure A15RF RF filter.