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

Pointless, Did not work at all.

Fake item, does nothing to filter the power noise, the noise is still there and the device has high standby power consumption of 3 Watts. don't waste your money.

I don’t know how it works, but it does. I run a mini pre-amp thru my boat stereo to use with a CB style mic as an inexpensive PA system. (Guided sightseeing charter boat). New boat had a ton of line noise when the engine was running. So much, the PA was not usable. I ran the 12v supply for the stereo and pre-amp thru this isolator, and it greatly reduced the noise. There is still some noise, but it went from un-usable to useable. To be fair to the remaining line noise, I have to crank the radio volume to 33-35 so my guests can hear me. That’s pretty high, and I don’t fault this product for not removing 100% at the highest volume. Oh, like others have said, the wire insulation is ridiculously thick, but the wires are maybe 14 gauge, and appear tinned. The thick insulation only makes butt connectors really tight.

Worked perfectly for my cheap Amazon CarPlay stereo. Had horrible alternator frequency being picked up, installed this and they went away.

This absolutely works if installed correctly. Most of the Dual Electronics stereos have an alternator whine due to cheap or non-existent shielding within the radio itself. This is from my own personal experience with the brand. If your old car stereo did not have an alternator whine, and now it does, and you’re sure it the new stereo was installed correctly, it’s more than likely the build quality of the radio. To completely fix the whining noise, do the following: connect the Power Filter on the yellow, constant-hot (memory) wire between the vehicles harness and the car stereo. The “input” wire connects to the vehicle’s harness, the “output” wire connects to the stereo harness. Ground the black wire to a metal component attached to the vehicle’s frame. ZERO noise is now coming through my speakers when the truck is running. No noise on Bluetooth, AUX, radio, etc. Excellent product!

This product was installed in a professional manner, and there was 0% accomplished with RFI elimination. Altenator/engine whine and static are present directly after installation. I mean the filter as advertised seems well built, out of metal and not plastic, thick insulation on the wires which is good. And yes as stated, it was installed in a professional manner.

The whine in the speakers was killing the music, found this and decided to give it a go, worked as intended, no more whine from speakers at all, toyota owners will appreciate this filter