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Shure A15RF RF Filter, XLR In/Out, Passes Phantom Power

4.7 4.7 out of 5 stars 514 ratings
$54.95 with 11 percent savings
List Price: $62.00

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RF Filter
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Purchase options and add-ons

Brand Shure
Item Weight 3.2 ounces
Item dimensions L x W x H 4.7 x 3.3 x 2.4 inches

About this item

  • The A15RF passes phantom power
  • Can be used with condenser microphones
  • The Shure A15RF reduces interference from AM radio stations that may bleed into microphone lines when using long cables in microphone installations such as suspending choir microphones
  • Country of Origin: China
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Shure A15RF RF Filter, XLR In/Out, Passes Phantom Power

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Product Description

The Shure A15RF reduces interference from AM radio stations that may bleed into microphone lines when using long cables in microphone installations such as suspending choir microphones. The A15RF passes phantom power, and can be used with condenser microphones. For best results, the A15RF should be installed at the end of the cable nearest to the microphone. In situations where this is not practical, the A15RF can also be installed at the mixer input, although RF attenuation may be somewhat reduced.

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SHURE Quality

Since 1925, Shure has turned a passion for making great microphones and audio electronics into an obsession. Shure continues to set the worldwide industry standard for superior, reliable products. SHURE accessories have the same high-quality standard as all our products.

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
514 global ratings

Customers say

Customers like the sound quality, performance, and quality of the electronic switch. They mention that it greatly reduces audio levels, works perfectly without any degradation, and is a very valuable piece of hardware. Opinions are mixed on rf interference.

AI-generated from the text of customer reviews

42 customers mention39 positive3 negative

Customers are satisfied with the performance of the vacuum filter. They mention that it works great, drops the levels right where they need to be, and works perfectly without any degradation of the signal. Some say that the filter is wonderful and useable, and does not disappoint.

"...It seems to work great with the Zoom H4n, which has really "hot" premaps...." Read more

"This Shure model is well built and does the job… however, -40 db is too much for my line-to-mic application...." Read more

"...Bam! These little babies are awesome. So far after 3 uses, they do wonders. I set my attenuator to -25 and just perfect!" Read more

"They work very well at the mixer in getting rid of am radio noise. However, we had a non common ground that was causing our problem...." Read more

29 customers mention29 positive0 negative

Customers are satisfied with the quality of the electronic switch. They mention it's well built, has a nice barrel, and has quality XLR connectors. Some say it'd be a great little tool and perfect for their needs.

"Very good item, totally solved the RFI problem i had of my radio signal getting into my mic cable...." Read more

"This Shure model is well built and does the job… however, -40 db is too much for my line-to-mic application...." Read more

"...Very high quality and a must have even to connect to a sound board." Read more

"...Great quality, too. Feels well-made, including the slide switch. Tip of the day: Don't cheap out on things like this...." Read more

26 customers mention19 positive7 negative

Customers like the sound quality of the vacuum filter. They say it produces a low noise signal, greatly reduces audio levels, and eliminates radio interference. Some say it's a great choice for audio interfaces without a high pass filter. Overall, most are satisfied with the sound performance of this filter.

"Work as intended. Greatly improved my sound quality for streaming. The audio sent to me was way too HOT!..." Read more

"...No more noise." Read more

"...Tried different mics, and turned the gain up. Don’t hear interference from anything. Not from my phone, wireless devices, neighbors, or anything...." Read more

"...but sometimes the problem is just the opposite and there is too much volume. For this kind of problem, this little thing is a great solution...." Read more

5 customers mention5 positive0 negative

Customers appreciate that the vacuum filter has adjustable attenuation level. They say the adjustable atttenuator rate came in handy in their installation, as it lowers the level perfectly. The filter is made of all metal construction and has the right amount of attenution to allow them to set the trim level.

"...This attenuator fixes that. The ability to adjust attenuation is a great feature. And yes, it really does pass phantom power...." Read more

"...15dB is just the right amount of attenuation to allow me to set the trim level at maximum and use the internal settings to fine-tune the level...." Read more

"Nice barrel with quality XLR connectors. Attenuation level can be adjusted - 15, 20 or 25 dB selectable...." Read more

"...It lowers the level perfectly for this. All metal construction. No noise, no fuss...." Read more

7 customers mention4 positive3 negative

Customers have mixed opinions about the rf interference. Some mention that the go between makes the signal to the mixing board perfect, clear as a bell, and is extremely versatile for lowering signal level. Others say that it didn't help with RF interference, and that they had unexpected RF problems.

"...Now our signal is clear as a bell. The difference is night and day. This product did exactly what I needed it to do. Highly recommended." Read more

"Last November I had unexpected RF interference right in the middle of church service...." Read more

"...This go between makes the signal to the mixing board perfect. With the drop down setting -15, -20, -15, you'll be covered...." Read more

"It did not solve the rf problem on the Mackie 1402VLZ that was demodulating a nearby AM radio station...." Read more

Shure works good!
5 Stars
Shure works good!
The microphone on my Denon MC4000 runs extremely hot. The slightest upward adjustment on my volume knob would case horrible feedback. This attenuator solved the problem 110%.. no more feedback and I have a fuller range of microphone sound control. Not the cheapest attenuator out there, but the solid build quality from a reputable company like Shure justifies the premium price.
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Top reviews from the United States

Amy
5.0 out of 5 stars Works really well to lower volume
Reviewed in the United States on July 24, 2021
style: Switchable AttenuatorVerified Purchase
Sometimes there is not enough volume and you need a preamp, but sometimes the problem is just the opposite and there is too much volume. For this kind of problem, this little thing is a great solution. It seems to work great with the Zoom H4n, which has really "hot" premaps. Line in was blaring if the volume wasn't way down, so this seems to bring the volume down to a reasonable level. The mic seems to clip a little too, so if I keep the Zoom H4n, I might need to get another one of these. What is nice about this little gadget is that it is switchable. I don't always need the highest setting so it's nice to be able to choose a setting that works for my set up. So far I am happy with this product.
3 people found this helpful
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Amazon Customer
5.0 out of 5 stars RFI GONE
Reviewed in the United States on December 2, 2023
style: RF FilterVerified Purchase
Very good item, totally solved the RFI problem i had of my radio signal getting into my mic cable. I’m ordering a second one for the output of my channel strip to insure there’s a clean signal going into the radio….bottom line, it worked for me!
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Jeremy Gronauer
5.0 out of 5 stars Does the trick attenuating an analog signal
Reviewed in the United States on April 8, 2024
style: Switchable AttenuatorVerified Purchase
Bought to attenuate down a hot analog XLR output. It did the trick and I was able to achieve like 10db down
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Sarge
4.0 out of 5 stars Well built, works
Reviewed in the United States on April 17, 2022
style: Line AdapterVerified Purchase
This Shure model is well built and does the job… however, -40 db is too much for my line-to-mic application. I was hooking a dbx 286s mic processor line out into the mic in of my Arrakis mixing console. -30 db is just about exactly right. I had to order another brand for that. I kept this one though, just in case I have a need for it. I would have paid the extra for the Shure brand, but they didn’t have a -30 db on Amazon
Additional… I found a small input adjust on the console I am using this device with, adjusted that slightly, and the 40db down is now about right.
One person found this helpful
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Amazon Customer
5.0 out of 5 stars It works!
Reviewed in the United States on January 6, 2024
style: Switchable AttenuatorVerified Purchase
Work as intended. Greatly improved my sound quality for streaming. The audio sent to me was way too HOT! This greatly reduced audio levels that was perfect for streaming!
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my_dear_aunt
5.0 out of 5 stars Definite RFI attenuation
Reviewed in the United States on January 30, 2023
style: RF FilterVerified Purchase
Last November I had unexpected RF interference right in the middle of church service. I have been doing sound / video in this church for several years, and this is the first time this issue cropped up. Turns out there was a crew clearing land not too far away, and apparently they have hot-rodded their CB sets. There were only two mics which were sensitive to the RFI, out of seven total I have in use during service. After installing these RFI filters, and not hearing anything for weeks I thought ahah, problem solved. Well last Sunday, it’s back, however bleed thru of the interference is greatly reduced due to the filters to a level that is unnoticeable while someone is speaking at mics, but just audible when mic channel is open, but no input from speaking, for example. So, just Mute the channel. Short story, these in fact do attenuate RFI, not eliminate it. At least the RFI is not anywhere near the objectionable level it was previously. Just a side note, for two cents worth, the mics that are very sensitive to the RFI are Samson (CM-20?) gooseneck mics. I have since ordered a couple of Shure CVG-18B gooseneck mics, they claim internal shielding for RFI, so we shall see!
2 people found this helpful
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Matt
5.0 out of 5 stars Great for API 512c preamp
Reviewed in the United States on August 11, 2023
style: Switchable AttenuatorVerified Purchase
Great for API 512c preamp that doesn’t have an output control. I stick mine on the output to converter and now can use DI boxes better. On my API512C I noticed just because it hits red doesn’t mean clipping! This is the go to for API 512c preamps! I just set it at the lowest option and was good enough to turn up and hit no louder than -12 to -6 or so. I wasn’t able to turn my API up more than 9 o’clock before this. Now I can go noon or more for the mojo of that preamp.
One person found this helpful
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Don B.
5.0 out of 5 stars Exactly Perfect!
Reviewed in the United States on February 12, 2022
style: Switchable AttenuatorVerified Purchase
I needed to take an XLR Mic Output into a Line in on XLR and was distorted, of course. I needed to drop the feed down so the audio was clean and controllable! Bam! These little babies are awesome. So far after 3 uses, they do wonders. I set my attenuator to -25 and just perfect!
One person found this helpful
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Top reviews from other countries

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tony manning
5.0 out of 5 stars good heavy duty feel
Reviewed in Canada on May 29, 2023
style: Switchable AttenuatorVerified Purchase
very useful device if your running from your own mixer and stage speaker set up and you want to run a line into the house mixer and speakers for additional set up and volume this is ideal it has 3 different db settings via a mini toddle switch this prevents your mixer line out from overloading the house mixer input preventing overload and distortion its not cheap but worth having in your cable box
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Cliente de Amazon
1.0 out of 5 stars Muy malo
Reviewed in Mexico on June 27, 2019
style: Switchable AttenuatorVerified Purchase
Lo compre por que uno de mis micros sonaba demasiado fuerte y no traia pad pero al poner el adaptador si suena mas despacio pero distorsionado y conste que ya lo probe con muchos micros.
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da2
5.0 out of 5 stars 使い勝手良い
Reviewed in Japan on September 4, 2023
style: Switchable AttenuatorVerified Purchase
ミキサーによるゲインの差を十分吸収してくれて、ミキサー操作が楽になりました。もう一つ必要になったらこちらを再度買います。
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Maureen White
5.0 out of 5 stars Qualify
Reviewed in Canada on August 13, 2023
style: High Pass FilterVerified Purchase
Works great, eliminates most interference
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アップルティー
1.0 out of 5 stars 購入前にちゃんと確認しよう！というレビューです
Reviewed in Japan on April 13, 2023
style: Switchable AttenuatorVerified Purchase
きっとshureだから！この形はきっと！
そういう期待で購入しました。。。
いやー、多分SHUREのせいではありませんね。
レビュー記事が全部外国語だったので読まずに形だけで購入してしまいました〜

SHUREのSM57のゲイン増幅のために捜していたブースターのところで見つけてしまったのがそもそもの発端です。
SHUREだからSHURE製品で揃えたらいいんじゃない？
価格もどこより安いし！と思ったのがミス。
この製品はゲインを稼ぐの逆パターンで使うものだったらしい。

日本語のレビュー記事が無いのに意気揚々とポチってしまいました。
でも、多分良い製品なのだと思います。
自分には合っていなかったというだけで、教訓を得ました。
ちゃんと英語レビューも翻訳してみよう！！

SHUREがゲイン稼ぐこの手の製品を出していただけるとありがたいです。
一応、星は一つずつにしておきました、ごめんなさい・・・
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アップルティー
1.0 out of 5 stars 購入前にちゃんと確認しよう！というレビューです
Reviewed in Japan on April 13, 2023
きっとshureだから！この形はきっと！
そういう期待で購入しました。。。
いやー、多分SHUREのせいではありませんね。
レビュー記事が全部外国語だったので読まずに形だけで購入してしまいました〜

SHUREのSM57のゲイン増幅のために捜していたブースターのところで見つけてしまったのがそもそもの発端です。
SHUREだからSHURE製品で揃えたらいいんじゃない？
価格もどこより安いし！と思ったのがミス。
この製品はゲインを稼ぐの逆パターンで使うものだったらしい。

日本語のレビュー記事が無いのに意気揚々とポチってしまいました。
でも、多分良い製品なのだと思います。
自分には合っていなかったというだけで、教訓を得ました。
ちゃんと英語レビューも翻訳してみよう！！

SHUREがゲイン稼ぐこの手の製品を出していただけるとありがたいです。
一応、星は一つずつにしておきました、ごめんなさい・・・
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5 people found this helpful
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