Shure A15HP High Pass Filter - Effective Low-End Control

In this review the Shure A15HP is presented as a simple, purpose-built inline high pass filter for live and studio microphones. The bottom line: it is for engineers and performers who need reliable low-frequency attenuation without altering mid and high content. The reviewer found the A15HP particularly useful for eliminating mains hum, wind rumble and stage transmitted floor noise, with a transparent effect above 100 Hz and no audible signal degradation when used with typical mixer mic inputs.

Key Features

• In-line high pass filter: Reduces low-frequency content below 100 Hz so microphones sound clearer in noisy environments.
• 12 dB per octave roll-off: Provides predictable attenuation of rumble and hum while preserving mid and high frequencies for natural tone.
• Female XLR to male XLR: Installs directly between mic and mixer for quick removal of low-end problems without rewiring.
• Compact, light package: Small physical footprint and low package weight make it convenient for stage bags and mobile rigs.
• Effective on electrical noise: Helps reduce 60 Hz electrical hum and similar interference so engineers spend less time EQing.

Who It's For

The A15HP suits live sound technicians, FOH engineers and touring musicians who regularly encounter wind rumble, floor-borne noise or AC hum and need a fast, hardware-based solution. It is also useful for studio engineers tracking sources prone to low-frequency bleed who want to protect microphone preamps and mixes without introducing processing latency.

It is less appropriate for applications that require adjustable cutoff points or variable slope control; users who need greater flexibility or multi-band filtering should look at inline or rackmount units with selectable filters.

Pros & Cons

Pros

• Transparent mid/high preservation keeps voice and instrument tone intact after filtering.
• Solid build quality consistent with expectations for a professional audio brand.
• Effective at eliminating mains hum and low-end rumble without added noise or signal loss.

Cons

• Fixed cutoff and slope means less flexibility than variable or multi-mode filters.

Specifications

Our Verdict

The Shure A15HP is a compact, reliable tool for anyone needing straightforward low-frequency control at the microphone. It delivers effective attenuation of hum and rumble with minimal impact on tone and no noticeable signal degradation, making it good value for live and mobile setups where simplicity and dependability matter.

Frequently Asked Questions

Will this filter affect vocal tone?
The A15HP is designed to reduce low frequencies below 100 Hz while preserving mid and high content, so vocal clarity is retained.

Can it remove mains hum?
Yes, customers report it helps reduce 60 Hz electrical hum and similar low-frequency interference when used correctly.

Does it require a special mixer input?
No, it is intended for use with typical microphone inputs of 800 ohms impedance or higher and connects via standard XLR.