PAC SNI-1 Noise Isolator

My Xiaomi Redmi Note 9 Pro produces annoying crackles on audio when on charge in the car. This little unit completely removes those noises without any obvious degradation of the audio quality. Installed in-line between the phone and the radio. Ground wire was not used. Perfect!

Done the job perfectly, so easy to install..... simply plug and play and the job is done.....perfect

Utiliser pour filtrer une boucle de masse sur les prise audio Rca d’une super famicom, absolument aucun effet

Works like a charm for stereo whine or buzzing noises. Game changer for my setup

Es muy fácil de instalar y funciona perfectamente, eliminando el zumbido de tierra.

Hatte übelstes Pfeifen in meinem Ducato Bus mit ordentlich Musik drin, hab das Teil direkt an den Audoradio angestöpselt und von dort aus in die Endstufe. Es ist endlich RUHE ......kein Pfeifen mehr, absolute Stille wenn die Musik auf Pause ist, kein Pfeifen mehr beim Gas geben. Die 2 braunen Masse Kabel hab ich nicht anschließen müssen. Bin sehr zufrieden !!

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.