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PAC SNI-1/3.5 3.5-mm Ground Loop Noise Isolator Works with iPod/Zune/iRiver and Others , Black

4.2 4.2 out of 5 stars 2,229 ratings
$12.50
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Purchase options and add-ons

  • Ground loop isolator
  • Close to perfect response of +/- 0.03 dB from 2-20,000 Hz
  • Utilizes proprietary audio transformers for a 1.3 dB gain
  • Female 3.5-mm input
  • Male 3.5-mm output

Frequently bought together

PAC SNI-1/3.5 3.5-mm Ground Loop Noise Isolator Works with iPod/Zune/iRiver and Others , Black
This item: PAC SNI-1/3.5 3.5-mm Ground Loop Noise Isolator Works with iPod/Zune/iRiver and Others , Black
$12.50
Get it as soon as Wednesday, Mar 19
In Stock
Sold by Gilded Inc. and ships from Amazon Fulfillment.
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BESIGN Ground Loop Noise Isolator, Ground Loop Buzzing Noise Filter, Ground Loop Buzzing Noise Elimination for Car Audio and
$8.99
Get it as soon as Wednesday, Mar 19
In Stock
Sold by BESIGN and ships from Amazon Fulfillment.
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Goliton AUX 3.5mm Cable Replacment Connect MP3 Phone Audio Compatible with Mazda 2006+ Car Player (2 Meter / 80 Inch Long)
$11.95
Get it as soon as Wednesday, Mar 19
In Stock
Sold by Soliport and ships from Amazon Fulfillment.
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Important information

Legal Disclaimer

This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Product Description

Line out converter for factory radios with 2 to 50-watts per channel. Accepts speaker level input and provides stereo RCA output signal for adding an aftermarket amplified audio system.


Product Features

50 watts maximum input per channel
Linear 20 to 20,000Hz output based on input signal
Transformer isolated for optimal sound and performance
Maintains correct phasing
Works with most factory installed radios

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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What's in the box

  • Converter

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    Customer reviews

    4.2 out of 5 stars
    2,229 global ratings

    Review this product

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    Write a customer review

    Customers say

    Customers find the auto accessory works well and is inexpensive. They find it easy to install and use, with no instructions needed. It eliminates static without sacrificing sound quality. Signal quality is also satisfactory. However, opinions differ regarding noise reduction, build quality, and size.

    AI-generated from the text of customer reviews

    Select to learn more

    Works wellValue for moneyEase of installationStatic removalSignal qualityNoise reductionBuild qualitySize
    870 customers mention "Works well"775 positive95 negative

    Customers find the product works well. It charges phones and streams audio through stereos. They say it connects computers to classroom sound systems. Many consider it a fantastic solution for the price.

    "...This completely fixed it AND the audio quality is unharmed. Stellar product!" Read more

    "...We will see how it lasts, but for the price, it is a fantastic solution...." Read more

    "...and long behold... the buzz was gone!!! This little thing works beautifully...." Read more

    "...Not an overly quality made product. It does however use isolation transformerS (two) ... so its not some hippy feel good product or magic black box..." Read more

    192 customers mention "Value for money"161 positive31 negative

    Customers appreciate the value for money of the auto accessory. They find it easy to install and inexpensive. The product lowers the volume level, and is worth considering.

    "...a shame because the electrical design on this unit is otherwise good for the price compared to the competition-- Radioshack's ground loop isolator..." Read more

    "...I was hoping for; these babies are OK for what you pay... which is quite cheap. I do have an issue with the mini stereo connectors...." Read more

    "Pros: Easy to plugin, cheap, lowers the volume level Cons: Cheap build..." Read more

    "...It's an inexpensive device that takes 30 seconds to install and fixes the problem. Hard to be upset with that result, this is a great product." Read more

    96 customers mention "Ease of installation"90 positive6 negative

    Customers find the auto accessory easy to install and use. It connects to the audio cord without any instructions needed. They say it takes two seconds to hook up and now they can enjoy their music static-free. The device is a basic device that works on most audio systems.

    "...It took seconds to install and bingo, no more alternator whine. The sound is crystal clear, even when I plug my phone into power...." Read more

    "...Unfortunately, that's not the case. It couldn't have been easier to install... plug one end into the cable coming out of the radio, plug the other..." Read more

    "Pros: Easy to plugin, cheap, lowers the volume level Cons: Cheap build..." Read more

    "...I was shocked at the delivery speed. Dead simple installation and I was astounded at the sound quality improvement...." Read more

    84 customers mention "Static removal"69 positive15 negative

    Customers appreciate the static removal feature of the auto accessory. It eliminates static without compromising sound quality. Some say it blocks feedback from Sirius radios, making the sound even better than before.

    "2/7/2013 Pro: 1. Removes static 2. Decent cord length Con: 1. Muffles sound. 2...." Read more

    "...did this filter stop the whining linked to engine RPM and remove nearly all static, but volume and clarity remained the same while bass actually..." Read more

    "...and sound output, I turned it up with nothing playing and there was 0 static!..." Read more

    "...NOT EVEN A HINT OF STATIC! The sound is actually even better than before...." Read more

    65 customers mention "Signal quality"48 positive17 negative

    Customers appreciate the signal quality. They say it reduces incoming signal level slightly, but boosts the signal and removes interference. The product also seems to increase lower frequencies (bass) and completely remove the interference.

    "...Radio is great but I noticed a significant amount of whine from the system when listening to Sirius on my Sportster 5 that's plugged into the back..." Read more

    "...The wireless functionality of the receiver was pretty sweet, but the sound took a turn for the worse with unacceptable alternator whine...." Read more

    "...Audio quality is excellent, and got rid of ground loop interference on my headphones...." Read more

    "...producing really poor audio quality and a lot of buzz, whine and other interference...." Read more

    1,282 customers mention "Noise reduction"879 positive403 negative

    Customers have mixed opinions about the noise reduction. Some say it eliminates spurious noise and improves sound quality. It immediately eliminates alternator whine, electronic feedback, and engine RPM whine. However, others mention a very loud whine or buzz when the engine is running and a loss in volume.

    "...speakers to bring to all of my meetings because the QSC K8 is a Phenomenal speaker (@ 1000 watts!) packed into a small package...." Read more

    "...Great audio components but poor build quality lead to a bad product. This is a video of the second (returned first) unit from PAC...." Read more

    "...It did what I needed it to do perfectly, the whine is not audible at idle during silence between tracks, the whine is not audible at 60+ MPH during..." Read more

    "...and speakers' audio-in immediately squashed the buzz with no impact to sound quality." Read more

    76 customers mention "Build quality"35 positive41 negative

    Customers have mixed opinions about the build quality of the auto accessory. Some find it well-built and reliable, with friction and hot-glue holding it together. However, others report issues like poor build quality, flaking out after a year or so, and breaking after 3 months.

    "...I tried using one of the FM transmitters, but it was unreliable and poor quality -- and if you were driving any kind of distance, you'd encounter a..." Read more

    "...So far it seems to be of very good quality, not fragile and looks like it could stand up to repeated plugging and unplugging as the connectors are..." Read more

    "...Great audio components but poor build quality lead to a bad product. This is a video of the second (returned first) unit from PAC...." Read more

    "...Also, I've included images of the unit itself. Its held together with friction and hot-glue. Not an overly quality made product...." Read more

    55 customers mention "Size"33 positive22 negative

    Customers have different opinions about the size of the auto accessory. Some find it small and discreet, tucking neatly into a compartment in their car and keeping it out of sight. Others say it's a little large and bulky, with the box being a bit bulky. The isolation component is also quite big, and the cable length seems somewhat long.

    "...Some people may have some issue with the size, but it tucks neatly next to my seat and you can't even tell it is there...." Read more

    "...The plastic side of the housing is loose and does not fit snugly into the metal casing...." Read more

    "...It's not extremely large, but it's bigger then it really needs to be...." Read more

    "...Anyway, fast forward to the Pac isolator, it's a little bigger than I hoped, so think ahead where you can hide it...." Read more

    Volume and fidelity loss is better than obnoxious buzzing and whirling.
    4 out of 5 stars
    Volume and fidelity loss is better than obnoxious buzzing and whirling.
    Well made, does what it says. I have a 26 year old mazda and when I charge whatever audio device that's aux-ed into my car I hear the buzzing/whirling. When I got this in my PO Box, I immediately plugged it in for the ride home. Lo and behold it worked! I drove all the way home in stop and go traffic and enjoyed my buzz free music. While parked at home, I decided to find out if the volume lost was noticeable to my own ears. My findings were disappointing. The noticeable amount of volume lost was almost the amount of "loudness" the buzzing was at its maximum. I would stay, if you have your iPhone plugged it, it was roughly 1 or 2 volume down button presses; or 10-20% subjectively. That means it will probably not perform loud enough for freeway driving in my car. So I gave it to my girlfriend who has a proper stereo in her car with all the wattage she could ever need but also shares this problem. I did however, order off for another one of these to have for those times I really have to charge my phone.So its worth it; but it does cause a loss in volume and I have to say, I noticed the music was less "full" even when I lowered the volume of the unfiltered test. So there's not only a loss of volume, but richness as well. Oh well, sure beats the heck out of BUUUUUZZZZZ WHIIIIIIIIIRRRRRRR! I'll use it when I must charge my phone, and when I don't; I'll raw dawg my phone on the aux cable.Also, I've included images of the unit itself. Its held together with friction and hot-glue. Not an overly quality made product. It does however use isolation transformerS (two) ... so its not some hippy feel good product or magic black box that you buy and it works because it makes you think it works. It actually has the proper components to eliminate ground loop problems (root cause of the buzzing). So they spent your $10 on making the device perform adequately and just slapped it together with a plastic case and hot glue. They also have nice rubber-like grommets to keep the aux cable from chafing on the hard plastic case, NICE! You paid $10, what more do you want? The transformers alone are worth $10 (or more) at radio shack. And admittedly I had to PRY the case apart...so it was made adequately as well. Not enough to keep out the curious however!
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    Top reviews from the United States

    • Adam K.
      5.0 out of 5 stars Ground loop noise GONE
      Reviewed in the United States on February 12, 2025
      Verified Purchase
      Klipsch Promedia 2.1 PC speakers had ground loop noise. Had to max out the volume in Windows so I could turn down the volume on the speakers otherwise there was constant horribly distracting buzzing, humming, popping, clicking. This completely fixed it AND the audio quality is unharmed. Stellar product!
      Helpful
       Report
    • James P. O'Keefe
      5.0 out of 5 stars OUTSTANDING!!! Must have for anyone with alternator whine or noise in their car audio system!!
      Reviewed in the United States on June 27, 2014
      Verified Purchase
      I have a Dodge Durango and installed an aftermarket radio with an auxiliary input on the front face of the unit. I am a car audio fan so I installed a full system with aftermarket speakers, amplifiers and subwoofers. I only mention that because I am very picky about my music and have a real hard time with any kind of noise in the system. I loved plugging in my iPhone or Android device and listening to Pandora or Spotify. However, as we all know, you can only listen so long before you want to plug your phone in for power or to charge. As soon as I attached power to my phone through either a USB plug in the console or through the cigarette lighter connection there would be horrible alternator whine in the system. I love music and this of course drove me completely crazy. I tried everything including buying a mini blue tooth receiver so I wouldn't have to plug my phone directly into the radio. However, the Bluetooth needed power so as soon as I plugged the Bluetooth receiver in for power, the alternator noise was right back. For any of you that have experienced alternator noise in your car radio, it is a horrible whine that increases or decreases in pitch related roughly to the speed you are going. The louder you turn up the radio, the louder the noise. It's bad.

      I had finally had it and tried to search online for some kind of isolator and found this little gem. It arrived today and literally just plugs in between your phone and your radio. It took seconds to install and bingo, no more alternator whine. The sound is crystal clear, even when I plug my phone into power. At the highest volumes, even with no music playing there is no background whine or even any hiss or white noise that sometimes comes in from other places in the system. The sounds was just perfect.

      Some people may have some issue with the size, but it tucks neatly next to my seat and you can't even tell it is there. The total length of the cable is a little short if you are plugging it in to the front of the receiver as it may hang down next to the radio. I would recommend either getting a short mini-phono extension cable (good quality) or simply affixing it to the side of the center console with some double sided tape. It is really fairly small and can be hidden out of the way pretty easily.

      So far it seems to be of very good quality, not fragile and looks like it could stand up to repeated plugging and unplugging as the connectors are very good. However, once you install it, you really never need to take it out. I will be getting one for each vehicle.

      We will see how it lasts, but for the price, it is a fantastic solution. I highly recommend this to anyone who has any kind of induced noise coming into their auxiliary plug in their radio. You won't be sorry! Good luck and good listening!
      3 people found this helpful
      Helpful
       Report
    • Matthew
      5.0 out of 5 stars Successfully stopped PC speakers' irritating ground loop buzz hum
      Reviewed in the United States on March 9, 2025
      Verified Purchase
      Exactly what I needed. Home PC has some densely packed electronics nearby. Router and/or UPS was inducing a super subtle buzz to the Klipsch ProMedia 2.1 speakers. (I'm admittedly extra sensitive to noise.) Putting this in line between PC's audio-out and speakers' audio-in immediately squashed the buzz with no impact to sound quality.
      Helpful
       Report
    • David
      4.0 out of 5 stars Volume and fidelity loss is better than obnoxious buzzing and whirling.
      Reviewed in the United States on March 27, 2016
      Verified Purchase
      Well made, does what it says. I have a 26 year old mazda and when I charge whatever audio device that's aux-ed into my car I hear the buzzing/whirling. When I got this in my PO Box, I immediately plugged it in for the ride home. Lo and behold it worked! I drove all the way home in stop and go traffic and enjoyed my buzz free music. While parked at home, I decided to find out if the volume lost was noticeable to my own ears. My findings were disappointing. The noticeable amount of volume lost was almost the amount of "loudness" the buzzing was at its maximum. I would stay, if you have your iPhone plugged it, it was roughly 1 or 2 volume down button presses; or 10-20% subjectively. That means it will probably not perform loud enough for freeway driving in my car. So I gave it to my girlfriend who has a proper stereo in her car with all the wattage she could ever need but also shares this problem. I did however, order off for another one of these to have for those times I really have to charge my phone.

      So its worth it; but it does cause a loss in volume and I have to say, I noticed the music was less "full" even when I lowered the volume of the unfiltered test. So there's not only a loss of volume, but richness as well. Oh well, sure beats the heck out of BUUUUUZZZZZ WHIIIIIIIIIRRRRRRR! I'll use it when I must charge my phone, and when I don't; I'll raw dawg my phone on the aux cable.

      Also, I've included images of the unit itself. Its held together with friction and hot-glue. Not an overly quality made product. It does however use isolation transformerS (two) ... so its not some hippy feel good product or magic black box that you buy and it works because it makes you think it works. It actually has the proper components to eliminate ground loop problems (root cause of the buzzing). So they spent your $10 on making the device perform adequately and just slapped it together with a plastic case and hot glue. They also have nice rubber-like grommets to keep the aux cable from chafing on the hard plastic case, NICE! You paid $10, what more do you want? The transformers alone are worth $10 (or more) at radio shack. And admittedly I had to PRY the case apart...so it was made adequately as well. Not enough to keep out the curious however!
      Customer image
      David
      4.0 out of 5 stars
      Volume and fidelity loss is better than obnoxious buzzing and whirling.

      Reviewed in the United States on March 27, 2016
      Well made, does what it says. I have a 26 year old mazda and when I charge whatever audio device that's aux-ed into my car I hear the buzzing/whirling. When I got this in my PO Box, I immediately plugged it in for the ride home. Lo and behold it worked! I drove all the way home in stop and go traffic and enjoyed my buzz free music. While parked at home, I decided to find out if the volume lost was noticeable to my own ears. My findings were disappointing. The noticeable amount of volume lost was almost the amount of "loudness" the buzzing was at its maximum. I would stay, if you have your iPhone plugged it, it was roughly 1 or 2 volume down button presses; or 10-20% subjectively. That means it will probably not perform loud enough for freeway driving in my car. So I gave it to my girlfriend who has a proper stereo in her car with all the wattage she could ever need but also shares this problem. I did however, order off for another one of these to have for those times I really have to charge my phone.

      So its worth it; but it does cause a loss in volume and I have to say, I noticed the music was less "full" even when I lowered the volume of the unfiltered test. So there's not only a loss of volume, but richness as well. Oh well, sure beats the heck out of BUUUUUZZZZZ WHIIIIIIIIIRRRRRRR! I'll use it when I must charge my phone, and when I don't; I'll raw dawg my phone on the aux cable.

      Also, I've included images of the unit itself. Its held together with friction and hot-glue. Not an overly quality made product. It does however use isolation transformerS (two) ... so its not some hippy feel good product or magic black box that you buy and it works because it makes you think it works. It actually has the proper components to eliminate ground loop problems (root cause of the buzzing). So they spent your $10 on making the device perform adequately and just slapped it together with a plastic case and hot glue. They also have nice rubber-like grommets to keep the aux cable from chafing on the hard plastic case, NICE! You paid $10, what more do you want? The transformers alone are worth $10 (or more) at radio shack. And admittedly I had to PRY the case apart...so it was made adequately as well. Not enough to keep out the curious however!
      Images in this review
      Customer imageCustomer image
      5 people found this helpful
      Helpful
       Report

    Top reviews from other countries

    Translate all reviews to English
    • Pt. Kashi Nath Mishra
      5.0 out of 5 stars It worked as described
      Reviewed in India on August 6, 2024
      Verified Purchase
      I connected to remove ground loop buzzing crackle after connecting monitor to speaker where already Raspberry Pi audio is connected. This solved the problem when I added it on the monitor side and fed to the audio system. Clean sounding
      Customer image
      Pt. Kashi Nath Mishra
      5.0 out of 5 stars
      It worked as described

      Reviewed in India on August 6, 2024
      I connected to remove ground loop buzzing crackle after connecting monitor to speaker where already Raspberry Pi audio is connected. This solved the problem when I added it on the monitor side and fed to the audio system. Clean sounding
      Images in this review
      Customer image
      Report
    • SADEEPA AROSHAN RATHNAYAKA
      5.0 out of 5 stars good product
      Reviewed in Italy on August 22, 2019
      Verified Purchase
      good product
      Report
    • Lola
      5.0 out of 5 stars PAC SNI INTERFERENCIAS ARTÍCULO DE GRAN CALIDAD
      Reviewed in Spain on November 18, 2018
      Verified Purchase
      MA HA LLEGADO EN 3 DÍAS Y ME HA QUITADO LOS PROBLEMAS QUE TENÍA CONE EL RUÍDO DE FONDO EN LOS AURICULARES.
      ARTÍCULO PERFECTO.
      Report
    • -db-
      5.0 out of 5 stars gesehen - rezensionen gelesen - dafür entschieden!
      Reviewed in Germany on December 7, 2017
      Verified Purchase
      ...gekauft 11/2017 um ~15 Euro.

      Wir haben in einem Raum eingebaute Lautsprecher welche zentral von einem PC mit Signalen versorgt werden.
      Wenn wir die Lautsprecher an den PC anstecken, dann brummt es bekannt fürchterlich und das nervt extrem.
      Wenn wir es allerdings an neuere Telefone anstecken war alles einwandfrei.
      Also ein meiner Meinung nach durch den PC und seine Masse verursachtes Problem.
      Massefilter gesucht und den PAC sni-1/3.5 mit dem 3,5mm Klinkenstecker hier gefunden.
      Der Preis war etwas günstiger als bei meiner zweiten Wahl und Primeversand und Rücknahme (falls etwas nicht passt) gibts auch noch.
      Bestellt - zwei Tage später (österreich) bekommen - angesteckt und weg war das Brummen.
      Einzig da der Ausgang des PC vorne am GEhäuse ist, steht der Stecker etwas raus - aber kein Problem - PC etwas umgestellt und alles passt.
      Kein Brummen, kein Summen - alles Perfekt.
      Rennt nunmehr seit zwei Monaten durch ohne Probleme.
      So stelle ich mir das vor, wenn ich einen Filter kaufe.

      Volle Kaufempfehlung!!

      Wenn euch die Rezension geholfen hat, würde ich mich über einen "klick" bei: War diese Rezension für Sie hilfreich "JA" freuen.
      Report
    • Rod
      5.0 out of 5 stars Fixes annoying static in car
      Reviewed in Australia on February 21, 2023
      Verified Purchase
      This filter appears to totally fix the annoying static I get when connecting my phone to the Aux port in my Mazda 3 and charging the phone at the same time. Great product and plugs in super simply.
      Report