I installed this on
Audi A6

Review
While a music lover, I'm by no means an audiophile. I had purchased some cheap 5x7 woofer, which were a big improvement over the factory speakers, but I still felt I wasn't realizing the full potential of my new head unit. After much research and reading many reviews I decided to go with these. I was honestly surprised by how much the Ground Zero GZIW 300Xs improved the sound across the entire spectrum, crisp highs, surprisingly good bass (it's kind of neat to see my side mirrors buzz to the bass) but what I was looking for most was improved mids and these really hit the spot.

What I like
Awesome sound quality these woofers have to deliver.

What I do not like
Quite expensive.