Purchased this item to reduce electronic whine in my car speakers while listening to my iPod. Worked as expected and was easy to install. A con would be the quality of the cables to the isolator box. After a while where the cables connected to the quick connectors started failing and would periodically cut out. This, in part, was due to how I installed it but would like to see these connections be made a little more sturdy.

I have a pioneer HU which is prone to blowing a pico fuse if you hot swap RCA's. Noise gets picked up through the RCA's these noise filters are cheap and work perfectly for eliminating alternator whine.

After installing a new head unit, there was a buzz in the speakers from the engine. I installed this product and the buzz was eliminated.

this was the first noise filter that i have ever bought. i got it because i had an whine that increased with the RPM of the motor and there was a hiss coming from the sub par head unit i have. this took care of about 75 % of the sound but when it is played at high volumes you can still hear the unwanted noises

I bought these noise filters do to a buzzing in speakers and alternator whine. I've never owned any b4 and these are my first. Had them hooked up and alternator whine was gone and buzzing wasn't as noticeable. After a month i think i cooked the inside of them because everything came back. I have two for each amp. 4 ch powerbass600w and 1 ch planetaudio 4000w. I like my music loud so maybe they couldn't handle it.