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Vaughn
Reviewed in the United States on January 21, 2020
My Situation: I have a ground loop issue caused by something internal to my new PC (Asus), which I'm not going to tear apart and figure out. Problem: USB ports have noise, analog ports have noise; front panel, back panel, all other equipment unplugged including keyboard and mouse. All equipment power cords are into a very expensive sinewave UPS, plugged into a single wall socket tested as good (polarity and ground). Problem is endemic to computer, I'm unable to replicate on my old PC (alienware), laptopx2, or phonex3.I'm using a 3.5mm to XLR (unbalanced), which runs to an amp then XLR (balanced) to my old studio monitors that I'm currently using as listening speakers. Not exactly a perfect "audiophile grade" set-up, but it's good enough for daily listening. Here's what I think...This thing definitely removes the ground loop noise, 100%. Very impressed. Complete silence in the line. During ear testing with "Train Song by Molly Cole" (FLAC): Without the PAC, I can hear the ground loop under the music like screwdrivers in my ears. With the PAC, The ground loop is gone. I cannot notice a significant difference in sound quality otherwise. I chose the song based on other reviews saying that this PAC destroyed high tones, the chosen song has high tones that are basically inaudible on lower grade speakers. Based on my perception of sound I believe the PAC does what it is supposed to do without significantly affecting sound quality. For me this was a cheap fix to a complicated problem that I feel should have been solved by the DAC that I use.Equipment used: KRK Rokkit 8, KRK 12sHO, Campfire Audio Solaris, Dragonfly Cobalt DAC.
Matthew Arrington
Reviewed in the United States on January 15, 2012
I bought this product to isolate noise generated on the headphone jack of my work PC.Unfortunately, the PAC turned out to not be suitable for this application.Other listings for this same product say generally "for 3.5mm applications", while this listing specifically calls out "between your receiver's auxiliary input and your portable music player".I can verify that the latter is correct, and that it doesn't work with headphones.When used between headphones and the audio device, the PAC does eliminate unwanted noise. However, I had the same experience as "Raydoc" (from ) - the music volume is reduced by at least half. Increasing the volume doesn't restore output levels, and the result is muddied. To test, I used 2 sets of headphones (small ear buds, larger closed phones) and 3 audio devices (work PC, home laptop, portable MP3 player). I also used a f-to-f coupler and aux line to allow trying the PAC in both directions. Every combination yielded the same result.I also tested the PAC between the MP3 player and my laptop's line in. The half-volume problem was not present in this application. One thing to note here is that the direction you have the PAC plugged in matters. Using the computer to monitor input levels, this is what I saw:* MP3 plugged straight into Laptop: peak 90%* MP3 plugged into PAC "Output": peak 70%* MP3 plugged into PAC "Input": peak 100%I wasn't sure this would work in the first place but figured it was worth a try. Hopefully this is useful for someone else thinking the same thing.
A. Agarwala
Reviewed in the United States on May 16, 2011
We recently decided to get car charging cables for our iPhones and noticed a hum when both the charger and the audio auxiliary cables were connected. Being familiar with the notion of ground loops causing hum, I went searching for an isolator and found this one. The picture indicated that I would need an extra 3.5mm stereo cable for each car and I was glad to see that I did not since it comes with a female jack and a male plug, each on short cables that go into the unit.It works very well to remove hum from our Prius and Sienna and I have uploaded the correct image from the manufacturer's website in case Amazon does not correct their stock picture. I am not an audiophile and have not noticed the filtering out of frequencies that others have mentioned.And the price is very good!
Me
Reviewed in the United States on December 13, 2011
All I have to say is WOW!!! I never write reviews but two seconds after I plugged this thing in I rushed in to write this one. I bought a serius sat. sportster 5 radio for my 2008 toyota 4runner. I would have never done this seing as how I hate fm transmitters. But when I found out I could use my auxilary in jack for the sound I was all over it. Turns out it sounded worse plugged into the aux. jack than it did with the fm transmitter. it had a whining and static noise that mirrored the RPM's of my truck. I was pissed. I did some research and found out it was a ground loop causing the problem. I actually (being a little electronically inclined) tried grounding the 12v plug straight to the frame of the vehicle. It helped a bit. It got rid of the whineing but not the static. I bought and plugged this thing in and the sound is perfect. no static, no whining, and most importantly no change in sound or volume. its like its hard wired straight to the radio. If your having similar problems dont evan think about it. Just buy one. By the way the main picture posted by amazon is not the product. The second photo provided by another reviewee is what you actually get. It just plugs in inline using your existing auxilary cable.
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