Boss Audio Ground Loop Isolator and Noise Filter

works very well in eliminating all alternator whine and interference noise for my subwoofer in my car

This was not fit for purpose. It increased the humming noise almost damaged my subs.

To my surprise this thing worked and worked well.

This was required to stop interference on a car head unit I bought, simple to install and did the job.

Eliminated weird noises that were occurring while gaming/high load on PC (that sounds like a motorbike/car engine)

Very light and plastic. Didn't remove my ground loop hum

I ordered this to try and silence ground loop noise on my Mac speakers. I had done some reading on the net and this seemed like it might be the cure for the loud buzzing I was experiencing with my external speaker setup.Sadly, the net result of installing this filter was that the noise actually significantly INCREASED!Disappointed, I then checked with the seller, caraudiosecurityuk and received a reply stating "If the product has been returned to us and there is no fault found, you are liable for all carriage costs and the time we spend on the unit diagnosing the fault. This charge will be £25.00 (which includes the carriage back)". I didn't fancy taking £25 worth of risk, so I binned it.I've since cured the buzzing by buying a good quality screened audio lead.

Good product, better than most I've tried.