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Shure In-Line 3-Pin XLR Radio Frequency Attenuator

Shure In-Line 3-Pin XLR Radio Frequency Attenuator
Key Features
  • Reduces Interference from AM Radio
  • Prevents Bleed into Long Cable Mic Lines
The Shure A15RF is an in-line 3-Pin XLR filter, which attenuates extraneous RFI (radio frequency interference) from balanced audio circuits.
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Shure A15RF Overview

  • 1Description
  • 2RFI Attenuation
  • 3Maximum Operating DC Current Rating
  • 4DC Impedance
  • 5Operating Temperature Range

The Shure A15RF is an in-line 3-Pin XLR filter, which attenuates extraneous RFI (radio frequency interference) from balanced audio circuits.

RFI Attenuation

Common/differential mode attenuation: 50 ohms in/out

Maximum Operating DC Current Rating

20 mA maximum for each balanced signal line

DC Impedance

0.4 ohm

Operating Temperature Range

-40 to 185°F (-40 to 85°C)
UPC: 042406088855

Shure A15RF Specs

In-Line Accessory TypeAttenuator/Pad
Input / Output LevelInput: Mic/Line Level
Output: Mic/Line Level
Number of Channels1
I/OXLR 3-Pin
Impedance0.4 Ohms
Operating Temperature-40 to 85°F / -40 to 29°C
Dimensions2.75 x 0.75" / 6.99 x 1.91 cm
Packaging Info
Package Weight0.235 lb
Box Dimensions (LxWxH)4.75 x 3.35 x 2.3"

Shure A15RF Reviews

We don't want to listen to the local FM station!

By Bob
Rated 5 out of 5
Date: 2021-06-17

Our 125 foot microphone line from the choir to our mixer was picking up the FM station one-quarter mile away. These attenuators did the trick fitting neatly at the end of the line!

Plug & Play - Works Great

By Mark
Rated 5 out of 5
Date: 2020-01-13

We had a local AM radio station bleeding over into our studio audio feed. We plugged in a few of these and the bleed audio was filtered out. Great solution!

Wonderful success

By Larry
Rated 5 out of 5
Date: 2016-05-02

I occasionally set up sound in a venue where RF is awful...destroys the whole mix. I decided to try one of these with a Behringer B-5 for an orchestra area that turns into a radio station without it! With it, the sound is back to orchestra! The product works. I placed it at the mic end.

RF Eliminator for Choir Mics

By trumpet tooter
Rated 5 out of 5
Date: 2015-12-21

These do a great job of eliminating RF interference picked up by the unbalanced cables between the pre-amp module and the condenser mic typical of hanging choir mics and some podium mics. Use right at the preamp module, not at the mixer for best results.

Just the Trick!

By maxrez
Rated 5 out of 5
Date: 2012-01-24

Excellent suppression of RF noise. Plugged the filter into the gooseneck microphone and into the mic base and the cell phone noise ceased. Placed a few more downstream as well. What a difference!

Worked when everything else failed

Rated 5 out of 5
Date: 2011-12-12

We tried all the other fixes & nothing worked. These worked great on our Church Choir Mics.

Exactly what I needed...

By Jeffrey
Rated 4 out of 5
Date: 2021-04-29

I work on audio/video for my church. We have an AM radio station nearby and often have trouble with strong RF interference. I recently wired an electric piano in the balcony up to our new sound system. I turned the unbalanced output signal to balanced right out of the jack, used the shortest cable possible, and added a ferrite core to one end. I got the RF interference about 10dB quieter, but still there. I ordered the Sure RF Attenuator, and got the RF interference down about another 10-15dB. The RF interference is still very slightly present when the radio signal is strongest. I set a noise gate to handle the residual noise, which works fine. The RF noise is not discernible while the piano is playing.

Didn't help at all in my RF environment

By Howard
Rated 2 out of 5
Date: 2021-02-07

My church is close to an AM radio broadcast tower, so RFI is a constant issue. Over the years we've managed to deal with it by using only the highest quality mic cables and diligent grounding schemes. Recently tried hanging a choir mic and it was filled with RF no matter what kind of cables I used. Tried inserting the filter at the mic and where it plugs into mixer, but neither helped at all. No reduction and certainly no elimination. Perhaps it's just not tuned well to RF we're getting.

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Will this filter RFI from the output of my mixer? ...

Will this filter RFI from the output of my mixer? If used at the amp?
Asked by: Derrick
Yes it should filter
Answered by: Raul M
Date published: 2021-11-28
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