It was installed on an A4 B5, very powerful, everything creaks for the 175W it takes, it gives a lot of pain. It was connected on top of a Sony 4-channel

Very good and powerful, I use it at low volume and it plays very nicely and sweetly as the build quality is evident. It takes up a lot of space in the VAG group small car trunk, definitely losing 2/5 of the trunk space. Whoever wants something very powerful and of quality, this is it. Whoever wants to hear just bass should go for the 8-inch Alpine, which has a similar setup.

The best value for money, very high-quality sound, I've been using it for 3 years and it still plays like new

I had heard it in a friend's car and I was very satisfied. I also installed it in my own car, driven by a 130w amplifier, and it plays very loud and clear.
One of its major advantages is the fact that it can be used both as a bass reflex and as a sealed box with a removable lid in the bottom slot. Personally, I use it sealed for more control in all genres of music, but if you want to give kicks to the rear passengers, you can work it as a bass reflex.