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AudioQuest - Jitterbug FMJ USB Data & Power Noise Filter

4.1 4.1 out of 5 stars 281 ratings

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Jitterbug FMJ USB Data & Power Noise Filter

Purchase options and add-ons

Brand AudioQuest
Connector Type USB Type A
Cable Type USB, Ethernet
Compatible Devices Personal Computer
Special Feature Full Metal Jacket (FMJ) Shields; Integrated Noise-Stopper Cap; Dual Discrete Noise-Dissipation Circuits See more

About this item

  • Dual discrete noise dissipation circuits reduce internally generated radio frequency noise to improve audio transmission performance
  • Reduces jitter and package errors
  • Full Metal Jacket protects against external noise
  • Built-in RF resistant USB output jack offers increased noise reduction
  • Meets all USB 2.0 specifications

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 0.79 x 1.18 x 2.36 inches; 2.88 ounces
  • Item model number ‏ : ‎ JITTERBUGFMJ
  • Date First Available ‏ : ‎ May 10, 2021
  • Manufacturer ‏ : ‎ AudioQuest
  • ASIN ‏ : ‎ B08YDFH63B
  • Customer Reviews:
    4.1 4.1 out of 5 stars 281 ratings

Product Description

AudioQuest JitterBug FMJ

Jitterbug FMJ

AudioQuest JitterBug FMJ USB Data & Power Noise Filter

Many tens of thousands of music lovers are already enjoying better audio enabled by the original AudioQuest JitterBug USB Noise Filter—plugged into cars’ USB jacks, laptop computers, USB “service-only” jacks on Ethernet Streamers, and more.

Now, JitterBug FMJ, with its Full Metal Jacket raises the stakes.

Whether used in series (in-line) or in parallel, JitterBug significantly reduces contamination from RF generated by a computer, car, or other device—JitterBug FMJ also thoroughly addresses everyday RF Noise taking advantage of this vulnerable interface.

The new metal case is the most obvious change, though even the seemingly innocuous hinged “rubber” piece covering JitterBug’s output is crucial to JitterBug’s improved performance. That little black “door” is RF-proof thanks to the material being substantially RF-absorbing Carbon.

Employ one JitterBug in series between any computer, smartphone, NAS, streamer, or car audio system and a USB input. For an additional sonic improvement, use a second JitterBug in another unoccupied USB port—in parallel to the first—except with JitterBug FMJ’s front door closed.

Noise reduction and noise dissipation is AudioQuest! One can’t hear our modern world’s pervasive RF Noise itself, but the compromises it causes robs us of detail and contrast, and outright buries so much subtlety. Fight back with JitterBug FMJ.

JitterBug FMJ

JitterBug FMJ

JitterBug FMJ with DragonFly Red
Use with DragonFly

A JitterBug in series with AudioQuest DragonFlys Black or Red always helps those wonderful creatures fly higher and faster. However, it’s best to experiment when putting a JitterBug in front of a DragonFly Cobalt—which itself employs some of JitterBug’s filtering, and so the two filters in series can help or hurt performance depending on specific equipment and context.

  • Regardless of which DragonFly or any other considerations, a 2nd JitterBug in parallel is always a delightful improvement as it pulls more RF Noise off the USB power bus
  • A JitterBug makes just as big an improvement even when plugged into service-only or update-only USB ports on many devices
  • JitterBug uses USB-A connections on both ends. When used with a computer or other device (or car) with only USB-C, AudioQuest offers a super-compact high-performance C-male to A-female adaptor

AudioQuest JitterBug FMJ

Noise reduction and noise dissipation is AudioQuest! One can’t hear our modern world’s pervasive RF Noise itself, but the compromises it causes robs us of detail and contrast, and outright buries so much subtlety. Fight back with JitterBug FMJ.

  • Dual-Discrete Noise-Dissipation Circuits reduce internally generated radio-frequency noise for improved streaming-audio performance
  • Reduces jitter and packet errors
  • Full-Metal Jacket (FMJ) protects against external noise
  • Integrated RF-proof USB output plug further reduces noise
  • Complies with all USB 2.0 specifications

What's in the box

  • jitterbug
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    Customer reviews

    4.1 out of 5 stars
    4.1 out of 5
    281 global ratings

    Customers say

    Customers like the quality and clarity of the electronic cable. For example, they say it's worth buying, built really well and provides more detail to the music. That said, opinions are mixed on sound quality and performance.

    AI-generated from the text of customer reviews

    16 customers mention12 positive4 negative

    Customers like the quality of the electronic cable. For example, they say it's worth buying, built really well, and is a value for money investment.

    "Works well for the money." Read more

    "This is a good product from a good developer. Works just as it's supposed to. Would recommend; and would buy again. Thanks!" Read more

    "...Both devices are worth buying. Period...." Read more

    "Took the edge off noise on the line, but not worth the money." Read more

    7 customers mention7 positive0 negative

    Customers are satisfied with the clarity of the electronic cable. They mention that it improves resolution and detail of the music, with better treble clarity, more air, and crystal clear recording and playback. It also provides more detail to the music and opens up the soundstage. Customers also appreciate the refined and airy trebe, and the bigger soundstage, which provides more dynamic presentation across the board.

    "...With the Jitterbug, music is more dynamic and clear. More bass punch. Complicated passages are no longer muddled...." Read more

    "...I can leave my mixer on with ZERO PC/monitor feedback. Crystal clear recording and playback...." Read more

    "...However, the JitterBug ups the ante with better treble clarity, more air, more sense of scale and space, more dynamic presentation across the board,..." Read more

    "...high frequency, more pronounced vocals & sweeter vocals, bigger soundstage...." Read more

    3 customers mention3 positive0 negative

    Customers like the frequency of the electronic cable. They mention that it has a smoother high frequency, which is immediately noticeable. They also appreciate the decrease of high end harsh peaks with low quality recordings.

    "...For those track that has improvement, definitely noticeable smoother high frequency, more pronounced vocals & sweeter vocals, bigger soundstage...." Read more

    "...Tidal streaming.Positives: There was a decrease of high end harsh peaks with low quality recordings...." Read more

    "...Smoother highs were immediately noticeable. Tighter base. Fuller midrange with lower noise floor. This was on a Mac book pro. Highly recommended!" Read more

    31 customers mention20 positive11 negative

    Customers are mixed about the sound quality of the electronic cable. Some mention that it improves the sound, making it louder and more open, with more bass punch. However, other customers say that it did hurt their sound quality, with sounds persisting after installing the device. Some say that the noise was caused by the poor audio circuitry on their motherboard, while others say that there was still some noise.

    "...With the Jitterbug, music is more dynamic and clear. More bass punch. Complicated passages are no longer muddled...." Read more

    "...This eliminates not only feedback from the laptop with the high-end HUMMMM, but also LCD monitor feedback buzzing noise. Works perfectly!!!..." Read more

    "...After 24 hours of run time, it seems to sound even better, louder and more open, so I suppose there is some burn in time with it...." Read more

    "...There was still SOME noise, so I also used the iFi GND defender and I now have perfectly clear sound...." Read more

    8 customers mention5 positive3 negative

    Customers are mixed about the performance of the electronic cable. Some mention that it works perfectly, is simple, and inexpensive, while others say that it didn't work in the slightest.

    "...Works perfectly!!! I can leave my mixer on with ZERO PC/monitor feedback. Crystal clear recording and playback...." Read more

    "...This device absolutely did not work in the slightest. Happy for those that it does work for, but this did not solve my issue even in the slightest." Read more

    "This is a good product from a good developer. Works just as it's supposed to. Would recommend; and would buy again. Thanks!" Read more

    "It works fine. The music sounds a bit smoother with this small yet well made product...." Read more

    Does the job
    5 Stars
    Does the job
    Full disclosure, I was on the fence about this product for a long time. The Internet is full of back-and-forth debates on whether it does anything. My best advice is, everyone's situation and issue is different - try it without any prior expectations and return it if it didn't help.This solved an unstable-handshake issue I encountered with a high-end DAC (AudioGD R27-RE) connected to my PC that's physically quiet but spews electrical noise. The DAC was unable to decode any PCM streams with >48kHz sample rate until I added this to the chain. In the past solving this kind of issue would have required a full digital interface unit with galvanic isolation between the input and output ports, or changing the connection to Toslink (which can present its own issues because it adds electrical/optical conversion steps using mass-market components).I won't share my personal opinion regarding changes this made to my music quality. If the result of suppressing noise and jitter is your DAC getting a clean digital stream that decodes more accurately to the original encoded sound, then yes, the signature can change. But there are many factors involved in this that determine whether any difference will be audible.
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    Top reviews from the United States

    Reviewed in the United States on January 27, 2024
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    One person found this helpful
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    Reviewed in the United States on October 29, 2022
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    4 people found this helpful
    Report
    Reviewed in the United States on June 17, 2023
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    2 people found this helpful
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    Reviewed in the United States on February 23, 2024
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    Customer image
    5.0 out of 5 stars Does the job
    Reviewed in the United States on February 23, 2024
    Full disclosure, I was on the fence about this product for a long time. The Internet is full of back-and-forth debates on whether it does anything. My best advice is, everyone's situation and issue is different - try it without any prior expectations and return it if it didn't help.

    This solved an unstable-handshake issue I encountered with a high-end DAC (AudioGD R27-RE) connected to my PC that's physically quiet but spews electrical noise. The DAC was unable to decode any PCM streams with >48kHz sample rate until I added this to the chain. In the past solving this kind of issue would have required a full digital interface unit with galvanic isolation between the input and output ports, or changing the connection to Toslink (which can present its own issues because it adds electrical/optical conversion steps using mass-market components).

    I won't share my personal opinion regarding changes this made to my music quality. If the result of suppressing noise and jitter is your DAC getting a clean digital stream that decodes more accurately to the original encoded sound, then yes, the signature can change. But there are many factors involved in this that determine whether any difference will be audible.
    Images in this review
    Customer image
    Customer image
    Reviewed in the United States on January 22, 2024
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    Reviewed in the United States on September 16, 2022
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on September 15, 2022
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    3 people found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    Guy Nadeau
    5.0 out of 5 stars Produit haute fidélité exceptionnel
    Reviewed in Canada on June 5, 2022
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    2 people found this helpful
    Report
    Genuino999
    4.0 out of 5 stars Sonido más claro
    Reviewed in Mexico on April 6, 2022
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    smiha
    5.0 out of 5 stars Surprise
    Reviewed in Germany on March 6, 2024
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    Dacsalamanca
    5.0 out of 5 stars Escéptico?
    Reviewed in Spain on February 9, 2024
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase
    Customer image
    Dacsalamanca
    5.0 out of 5 stars Escéptico?
    Reviewed in Spain on February 9, 2024
    Había leido de todo de este aparatito.
    No elimina el ruido de estatica ni los sonidos raros de el USB, eso suele ser un problema de masas o malos aislamiento ( si a alguien le sirve... yo lo solucione anulando la toma de tierra con cinta aislante en las tomas de tierra del shucko de mi pc reproductor (NCR en las fotos, ni filtros ni regletas... que tambien tengo y recomiendo para proteger el sistema).
    Volviendo al Jitterbug, no sabria como explicarlo , algo ha quitado y algo a cambiado. La escena se ensancha y todo tiene mas sitio y amplitud , mas organizacion y detalle. ( coros , ecos ) es como tener prismaticos y ver lo que no ves de lejos , por intentar hacer entender, no varia la ecualizacion pero los graves se naturalizan y los agudos se perfilan sin colorear . Tal vez lo que quita simplemente es el “velo” no soy experto pero tengo claro que había un obstáculo que ahora no hay. Evidentemente el equipo tiene que cumplir unos requisitos medios altos para apreciarlo. el mio...
    Pioneer SA-3000 (antiguo pero bueno) de amplificador.
    Gustard x26pro DAC
    Epos m5i Altavoces
    Topping A30 pro para auriculares AKG ak-551
    cableados :
    altavoces QED , dac amp y head amp Van Den hul mkII,
    usb Audioquest Carbon 60cm
    REgleta corriente
    Dynabox x1000s
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    One person found this helpful
    Report
    nick jones
    5.0 out of 5 stars Great little device
    Reviewed in the United Kingdom on August 12, 2023
    Style: Jitterbug FMJ USB Data & Power Noise FilterVerified Purchase