Car Power Filter EMI Noise Ground Loop Isolator Suppressor for Auto Stereo Audio Radio Stereos Amplifier Amp Speaker Equalizer Subwoofer 12V

Firstly, I must point out that I am not an audio technician. I'm just somebody who enjoys having a go at upgrading cars I own as much as possible. Having purchased a BMW e91 Touring M-Sport recently, I also purchased a replacement Android stereo to allow me to have DAB+, Google Maps, hands free calls etc. etc. Fitting the stereo was much easier than in previous cars, the (CANbus compatible) wiring was pre-configured to allow the steering wheel controls to work out of the box; not something I've come across with previous Japanese cars (Lexus and Toyota). Having fitted the stereo, everything worked as expected. However, I had lots of noise/interference through the speakers. Both DAB+ and FM as well as with nothing playing. It was a mixture of a high pitched tone that changed when accelerating and a lower pitched 'crackle' type of sound. Research suggested numerous potential causes, but most people pointed to alternator whine/ground issues as the culprit. Anyway, fitting this box (which was very easy for someone with a little bit of knowledge about wiring) has resolved the issue entirely. All the unwanted noise has gone...nothing. No interference, crackle, whine, high pitched tone or anything other than whatever I'm playing on the radio! Perfect. I'm so pleased, this product exceeded my expectations!

Fitted it inline with the power supply for my Yatour device that was fitted to my Audi RNS-D stereo system in the hope of removing alternator whine when driving. Sadly it made no difference at all so I returned it for a refund. I don't know that my 1 star review is fair as seemingly other people have had great results with these for similar applications, but for me it was no improvement. I guess it's always worth trying and send back for refund if it does not work....

Got this to attempt to get rid of some audio noise from my tube amplifier powered by an LED power supply. Well in short, it worked!Don't know why insulation is so thick for such thin conductors. Would rather have thicker conductors to help with resistance.

Does the job... no more buzzing. The wires are small gauge but the insulation is crazy thick, I had trouble fitting them in to the wire stripper !!Would definitely recommend

Wasn't sure if I should give this 2 or 3 stars. I can't say it doesn't work which is why I won't give it 1 star , but I can say it didn't work for me at all. Made no difference to the alternator whine. I tried installing it on the power to the head unit, & the power to the amp that runs the 4 door speakers without any effect.

Used 1 on the rear camera 📷, 1 on the head unit display, seems to of reduced/stopped the interference on the rf

I bought a Car Power Filter EMI Noise Ground Loop Isolator to get rid of the annoying noises in my car stereo. I was having alternator noise and other noise come through before, but now it's just the tunes that get through. It worked a treat, just what I needed. I'm very happy with this product and I recommend it to anyone who has the same problem.

It didn't worked for me. The problem may be something else.