Gli Ground

Which Ground Loop Isolator should I buy?

I want to buy a ground loop isolator for car-audio application (temp solution).
After installing a sub and amp into my car, I started hearing humming noise out of sub.
I know this is most probably due to grounding and shielding issues, and was told that ground loop isolator would fix (temporarily patch) the problem until I find the source of the noise.
Anyways,
Which brand of GLI should I get and where can I buy it?
The Scosche brand at Walmart is cheap, but would it get the job-done.
I read some reviews online, and people who buy it are satisfied, but some have experienced loss of sound quality when using those.

I try to find for you and I found

http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26x%3D16%26ref_%3Dnb_sb_noss%26y%3D21%26field-keywords%3D%2520%2520Ground%2520Loop%2520Isolator%2520%26url%3Dsearch-alias%253Daps&tag=lttp-20&linkCode=ur2&camp=1789&creative=390957

Hope it help.

Hidden treasures – Domenico Cimarosa – Gli Orazi ed i Curiazi (1796) – “Voce augusta del ciel” (2/2)

MK5 MK6 VW GTI GLI BATTERY CABLE NEGATIVE GROUND FACTORY OEM GOOD CONDITION $12.00

Hall Research GLI-RCA Stereo Audio Ground-Loop Isolator & Filter with RCA $18.95

Blaupunkt GLI1 Ground Loop Isolator Car Stereo In-Line Noise Filter $4.99

FENCE POOL 3 Sections 24″H Add-on Modular Above Ground GLI Protect-A-Pool New $138.87

FENCE POOL 2 Sections 24″H Add-on Modular Above Ground GLI Protect-A-Pool New $109.87

FENCE FOR POOLS with 8 Uprights Resin 24″H Above Ground GLI Protect-A-Pool New $248.87

FENCE FOR POOLS with 13 Uprights Resin 24″H Above Ground GLI Protect-A-Pool New $418.87

FENCE FOR POOLS with 10 Uprights Resin 24″H Above Ground GLI Protect-A-Pool New $328.87

FENCE FOR POOLS with 9 Uprights Resin 24″H Above Ground GLI Protect-A-Pool New $328.87

FENCE FOR POOLS with 11 Uprights Resin 24″H Above Ground GLI Protect-A-Pool New $348.87