The Shure A15RF In-Line RF Interference Attenuator is a professional microphone accessory designed to reduce unwanted radio frequency (RF) interference in microphone signal lines. Particularly effective at reducing interference from AM radio stations, the A15RF helps address radio signals that can enter microphone cables and interfere with audio quality.
Ideal for long microphone cable runs, suspended choir microphones, churches, auditoriums, and installed sound systems, the Shure A15RF provides a practical solution for minimizing RF interference without replacing existing microphone equipment.
The A15RF also passes phantom power, allowing it to be used with compatible condenser microphones in professional audio installations.
Reduce AM Radio Interference in Microphone Lines
Long microphone cables can sometimes pick up unwanted radio frequency signals, especially in installations where cables extend across large rooms or are routed near sources of RF interference.
The Shure A15RF helps attenuate this interference before it affects the audio system. It is particularly useful in applications involving:
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Suspended choir microphones with long cable runs
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Church and house-of-worship sound systems
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Auditorium and theater microphone installations
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Conference and meeting room audio systems
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Professional microphone installations affected by AM radio interference
Even when interference is not clearly audible, reducing unwanted RF components may improve perceived audio quality in affected systems.
Phantom Power Pass-Through for Condenser Microphones
The Shure A15RF supports phantom power pass-through, making it compatible with condenser microphones that require phantom power from a mixer or microphone preamplifier.
This is especially beneficial for suspended choir microphones and other installed condenser microphone systems where RF interference may occur along extended cable runs.
Recommended Installation and Placement
For the most effective RF interference reduction, Shure recommends installing the A15RF at the microphone end of the cable, as close to the microphone as practical.
Depending on the installation, several placement options are available:
At the microphone end: Preferred placement for optimal interference reduction.
At the mixer input: An alternative when installation near the microphone is impractical, although RF attenuation may be reduced.
Multiple A15RF units in series: For severe interference problems, two or more units may be installed in the same microphone line, preferably with one at each end of the cable.
These installation options provide flexibility for troubleshooting RF interference in existing professional audio systems.
Shure A15RF Key Features
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In-line RF interference attenuator for professional microphone systems
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Helps reduce interference from AM radio stations
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Particularly useful with long microphone cable runs
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Phantom power pass-through for compatible condenser microphones
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Recommended placement near the microphone for best performance
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Can be installed at the mixer input when necessary
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Multiple units may be connected in series for severe interference conditions
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Suitable for suspended choir microphones and installed sound systems
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Helps reduce unwanted RF interference in microphone signal paths
Shure A15RF Technical Specifications
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Specification
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Details
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Manufacturer
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Shure
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Model
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A15RF
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Product Type
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In-Line RF Interference Attenuator
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Primary Function
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Reduction of RF Interference in Microphone Lines
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Target Interference
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AM Radio Frequency Interference
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Phantom Power
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Pass-Through Supported
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Recommended Installation
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Microphone End of Cable
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Alternative Installation
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Mixer Input
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Multiple-Unit Configuration
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Series Installation Supported
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Typical Applications
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Long Microphone Cable Runs and Installed Sound Systems
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Common Applications
The Shure A15RF is suitable for:
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Suspended choir microphone installations
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Churches and houses of worship
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School auditoriums and performing arts facilities
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Theater and stage microphone systems
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Commercial and institutional audio installations
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Long microphone cable runs affected by radio interference
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Condenser microphone systems requiring phantom power
Why Buy the Shure A15RF from Audio Supply?
Audio Supply carries professional Shure microphone accessories, signal management products, and installation equipment for commercial audio, houses of worship, and professional sound systems.
The Shure A15RF In-Line RF Interference Attenuator is a practical accessory for installers and audio technicians working to reduce unwanted radio interference in compatible microphone systems.
