PAC Ground Loop Isolator for 3.5 MM Applications

• Great For Portable Xm/Sirius Radios That Have Noise When Plugged Into The Vehicle
• Use with sat radio, mp3 players
• 3.5" noise filter

I don't normally write reviews, but I didn't see any for this product and took a chance on buying it, and it worked out well, so I thought I should write one.

I have an iPhone that I use to play music via the aux-in port in my Prius and there was a lot of noise in the signal, especially if the headlights were on, and this was particularly problematic if I turned the volume way up for soft music (e.g. Renaissance lute music).

With this noise filter, that problem is gone.

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I have a car stereo with an AUX-in port. Unfortunately, when my car is running and I have my iPod plugged in, I get a very obnoxious electronic whine (more noticeable during the summer at night, with the headlights on and the ac running...the more electrics running in your car, the louder the whine). It would get so bad that it would make listening to music more of an annoyance than anything.

Searching on Amazon for an auxiliary charger for my iTouch, I came across this in a "Buy these two devices together and save" item. And I am happy to say it completely eliminated all electronic whine/feedback. It could not be simpler to install...plug one end of the isolator into your AUX port, and the other end into your iPod/mp3 player/auxiliary accessory(Griffin AutoPilot FM Transmitter for iPod, Kensington LiquidAUX Auxiliary Car Kit with Remote for iPod; iPhone 1G, 3G, etc.) It works like a charm. The way it works is its circuitry isolates any ground loops in your stereo (depending upon how it was installed, you may have a bad ground and that can cause an annoying whine).

HIGHLY recommended for anyone who wants to listen to their music and charge at the same time.

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I have an old school 15gig iPod which is great in the car because the buttons aren't on the click wheel. Well, the battery doesn't last anymore and everytime I played it with the battery adapter on, you could hear the whine from the alternator on acceleration. After plugging through the PAC, silence. I dare say, the music actually sounds better! Very, very satisfied.

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I don't know what this thing really does, but it is magic. Without it, plugging my NookColor into my decent quality portable speakers created awful static noise. The noise was so bad that I almost returned the NookColor as defective (my ipod and cell phone work fine with the same speakers). A friend recommended this PAC device, which he bought for $20 at a local car stereo store, but I bought for $13 here at Amazon. It is magic. Music played from my NookColor now sounds wonderfully clear.

The PAC device uses no batteries; just plug it in like a headphone cable. My friend says it matches the impedence from a music player and incompatible speaker systems. I don't know what that means, the Amazon description is not helpful, and the device comes with no useful documentation, but it really does work.

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I hooked my PC up to my TV and my home theater system and was getting some terrible humming in the line between the PC and the sound system. I put this ground loop isolator on the line and like that, no more unwanted noise. Highly recommend this if you have a hum from an AUX cord.