I bought this subwoofer a week ago and installed it in my 2014 Toyota Prius. It’s a tight fit, but it does fit under the passenger seat.
I wasn’t expecting really deep frequencies from a subwoofer the size of a matchbox, but boy, was I wrong! The sound is absolutely stunning. I’m glad I bought this unit instead of a huge enclosure that would block the entire trunk. I can highly recommend this subwoofer.