In Phase USW300 300W Underseat Subwoofer - Active Car Subwoofer with Built-in Amplifier

Absolutely excellent for the money small unit with a big kick of bass

Absolutely great sub for the price . Nice crisp base and sounds great

Surprisingly good sub, I fitted this under the rear seat in a classic beetle. It sounds great and only needs the bass assist low for a great sound.One thing to note is that I'd recommend connecting the blue remote wire to an ignition live even when using the high level speaker input. The amplifier sleeps when it sees no signal (even between songs) causing a small delay at the beginning of a new song with no bass.

After some issues getting it to power on, it works great. Built very strong and feels like it should stand the test of time but we will see. Sound wise, I wasn't prepared how much a small sub can do. And being able to adjust it on the fly means you can dile it in with ease

A nice edition to a factory car sound system that lacks low frequency. Running wires in a car isn’t the most fun thing to do, at least the kit came with everything needed to connect to the factory system.

Good sound nice bass

Powerful for size, easy to install, good instructions. Not as good as separate amp and sub, but massive improvement on my existing head unit on its own.

Some months ago I bought the 8" subwoofer. It was great so I decided to get a second for another vehicle. The listing now also included a 10" subwoofer so I bought that one instead. Sadly it is not up to the standard of the 8" one. It rattles badly at a reasonanble volume and only really plays one bass note. The build quality is also inferior to the 8" one. I can't recommend it. I'd have returned it if I'd not paid to have it installed, which involved the wires being cut, making it unreturnable.Buy the 8" one. It is built much more sturdily, does not rattle and plays a range of notes.