PAC SNI-1/3.5

3.5mm Ground Loop Noise Isolator Works

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• 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 3.5mm Input
• Male 3.5mm Output

Learn more about the sni135
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Ground Loop Isolator

If you are like most folks, you probably hate when you plug your portable music player into the 3.5mm (headphone jack) aux input on your car stereo and get an annoying whine that interferes with music playback. Well if so, the PAC SNI-1/3.5 is the answer for you. PAC's SNI-1/3.5 preamp noise filter plugs in between your receiver's auxiliary input and your portable music player and helps reduce noise caused by ground loops. The filter includes a female 3.5mm input, a male 3.5mm output, and 10 inches of cable for each jack.

Product Features

  • 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 3.5mm input
  • Male 3.5mm output
  • 10 Inches of cable for each jack
  • 1-year Manufacturer's Warranty

Product history:

PAC LPGL-2 thumbnail
(newest, current model)
PAC SNI-1/3.5 thumbnail
(previous model, replaced by PAC LPGL-2)

Specifications & Details

Noise Filter Specifications
Noise Filter Type
Ground Loop Isolator
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details



Model Number:




Internal SKU:


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Customer Ratings & Reviews

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Customer Reviews

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Works well

Cheap, simple, does the job. Removed all the noise from a leaky audio input jack.

By Sean on January 7, 2014


found this helpful.

Excellent perfomance: no more Alternator Squeal

The price is right and if you need a stereo-mini ground loop isolator, look no further. My Aux-in was very noisy until I used this filter. Just plug it in right before the Aux-in.

By eeast on August 19, 2013


found this helpful.

eliminates static in car

I got this gadget to eliminate the bad static I heard when listening to my DroidX through the car speakers and plugged in to the car charger at the same time. Works like a charm! A friend had recommended it and it works great for him too on his iPhone.

By LM on October 10, 2011


found this helpful.

Good value but

This is the third SNI-1/3.5 I've bought, and they seem to work great for the first year or so and then the audio quality begins to get muffled and I have to buy another. I should note that I use this unit for my music input in a small (noisy) airplane, and there's lots of vibration the unit needs to deal with. So that said, it's seems to be a good unit but wouldn't recommend it in a high vibration environment.

By GlobalPolygraph on December 21, 2011


found this helpful.

Does Exactly What It Is Suppose To Do

I had a ground loop noise problem in my wife's 2008 Mazda 3. Plugged this in and the noise was gone. Much easier than messing with the internal wiring.

By Brett on June 7, 2011


found this helpful.

does what it should

The product worked perfectly in my application, totally eliminating the hum problems in my portable sound system. I purchased two more after testing the first one.

By Cliff on November 14, 2011


found this helpful.

Works perfectly

Recently bought a Mazda5 with an AUX jack. Problem was, when I plugged my iPod into it, it sounded like the noise was coming through a lawn mower. After some searching, I came across this little gem. Plugged it in between the headphone jack of my iPod and the AUX jack of my Mazda and voila, no more lawn mower noise, just sweet, sweet music. Thanks Sonic!

My one complaint - seems like this probably could have been a bit more sleek. It hides well enough (it's about a 2" cube) but something a bit slimmer would have been even better. That's just a minor quibble though.

By EnjoyingBetterSound on December 7, 2010


found this helpful.

Problem Solved!

This device eliminated the interference I experienced when I had my iPhone connected to the car's power source and sound system. It fits nicely in the console box of my 2007 Prius and plugs into the port for auxiliary devices. I plug the audio cable directly into the device. Simple. Inexpensive. Effective.

By Jim W on September 25, 2011


found this helpful.

Works Great!

I bought the PAC SNI-1/3.5 preamp noise filter about 6 months ago and have it permanently plugged into my car's mp3 outlet and leave my ipod plugged into it.... it eliminates all the nasty hissing I used to hear, I highly recommend this device if you experience any interference.

By Jack on July 8, 2009


found this helpful.

Works as advertised

I bought this for my Toyota Camry with an auxiliary input. With some cars, if you try to plug in the power as well as the audio cable to your iPod/media player, there will be electronic interference and cause a slight buzzing through the speakers. By putting this adapter in between the player and the input for your car, this can reduce (and for me, remove) any of that interference.

Great product, highly recommended!

By Znanoc on December 11, 2011


found this helpful.

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PAC SNI-1/3.5

• 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 3.5mm Input
• Male 3.5mm Output



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