PAC SNI-1 Noise Isolator, 1 Count

Worked perfectly. Ground loop hum solved!

Good

When my subwoofer rca was plugged into my dsp it would create a loud alternator whome through all my speakers but only when the sub rca’s are connected. Decided to give this lil guy a try and honestly it solved all of my problems. There is no more signal interference/whining/ hissing nothing coming from my speakers when using the SNI-1. Plugged it directly into my subwoofer amplifier rca input and the connected my rca’s. No more disturbing noise. This did not affect my bass either as some reviews said it would muffle or decrease the bass. It has done neither in my experience so far i havent noticed any loss in bass but then again i have alot so maybe the lil bass i lost isn’t noticeable. But overall if your experiencing a very loud whine/hiss or any signal interference give this a try and see if it works you. To my surprise it worked for me!

It did reduce the ground loop noise I had. Enough that it is bareable, but it is still present when nothing else is on but the stereo. Before using the product I had to turn up the volume to about 15 to get past the whine. Now it is almost completely muted by just the sound of the engine. It does reduce the sound quality of your speakers and it does sound tinny. I was able to eq a good amount of the tinny sound out. I'd suggest trying it out. Just be aware that this product may not completely solve the issue. It works enough that I'm gonna keep it.

I just finished a massive stereo upgrade in my truck that included ripping out the ENTIRE interior, installing sound deadening materials and re-wiring everything. I installed a high-end touch screen head unit, component speakers up front, coax in back, wired up for a sub (to be installed later) and included an Infinity Reference Series amp. The first time turning it on I was so thrilled with the way it sounded! I spent a few hours tweaking and adjusting the inputs and levels to get it just right. What an upgrade to the factory system!Until I turned on the engine...All of the awesomeness disappeared in a flash when I heard the loud hiss and whirring noise in the background as soon as I started the engine. I felt like all my effort was for nothing... I pulled a bunch of things apart, testing various connections and ensuring that I had good grounds everywhere, etc. After a couple of hours of swapping cables and trouble-shooting (including testing voltages across various ground points, etc) I finally gave up and decided to "punt" and install ground loop isolators. These are usually a "last resort" because they typically attenuate the signal coming from the head unit and there is a discernible loss of sound quality in higher end systems.After a bit of research I decided on these PAC units - mostly because of positive results being reported, but also because of their reasonable price (some other units I considered were $50 each).They took just a few minutes to install to the head unit and I hesitatingly turned the stereo on (without the engine) expecting to hear a dramatic loss in sound quality. I was THRILLED to find that I could not tell the difference with the typical music I listen to (reggae, jazz, classic rock). I didn't even need to tweak to EQ to maintain the natural sound I had before.This seems to be one of those rare cases where the manufacturer's marketing hype actually seems true - they totally eliminated my engine noise without creating a discernible change in sound quality.

I used this to fix an issue I had with speaker thump/pop when I power off my aftermarket car stereo. I connected it to the subwoofer-out RCA connector of the stereo. I also have a 12v to 5v step down converter but that wasn't enough to fix the pop. My car is a 2007 Mustang GT with Shaker 500.

Audio ground noise can be a difficult thing to troubleshoot, especially when it's in a computer: is it the audio cable? A shielding problem? Hard drive noise? Stray fan interference? Sometimes the place where there's a bad ground can be hard to find.On the one hand, this product is sturdy, well built, and looks like it would do the trick.On the other hand, the PAC SNI-1 Noise Isolator didn't solve my problem...but I can't tell you whether that's a failing of this unit because I suspect the problem lies outside the loop where I could apply this device. So I'd like to share my experiences in the hopes that it would help anyone else trying to run down a ground issue.I had two computers, one with MAJOR problems with noise. The PAC SNI-1 Ground Loop Noise Isolator did nothing on the worst machine. On the other machine, it slightly reduced the noise. Unfortunately, it was nowhere near the success that other folks here have apparently experienced. Whether I turned the volume to low levels (less current = less noise?) or high (drown out noise with actual sound?), there was no difference--still only a slight containment of the problem. In both cases, I did try to use the optional grounding wire. Whether I applied it on the chassis or another source of bare metal, the effect was unchanged.Just the same, this product is well built, its construction is of good quality, and it is cheaper than other similar products. Since it apparently *can* solve some problems, I will just say, if it works, it'll probably work well for you. If it doesn't, your problem may run deeper than the PAC-SNI-1 Ground Loop Noise Isolator can handle.

Plug and play to remove audio pop on startup and alternator noise on C4 Corvette with Delco Bose speaker system but aftermarket head unit. Didn't need to connect ground wires either (instructions say to only connect if no sound is heard at the amp). Unfortunately, bass around 50-100Hz lowered, audio loses some of its depth and sounds kind of tinny. If you can avoid using this by fixing the ground loop at the source, do it, but if you're in a situation like me reusing the OEM amps and getting this issue (and your speakers aren't great to begin with), it's a good one-stop solution.