Ground loop isolators
 

I have a Source (Radio Shack) ground loop isolator inline with my front outputs to my mid and midbass amps which is failing on one channel. It is the second one I've had in the last few months. I'm afraid the 4V pre-out of my HU is too much for it (or they're just utter garbage).
Do any of you have any expereince with other manufacturers? Looking at Stinger or PAC.

Please don't suggest troubleshooting. I have neither the time nor patience, and when the GLI works, its solves the problem 100% without issue.
Thanks!

I have used the Stinger and it works well.