The db351 is a great in-dash or rear seat speaker. It's compactness makes it an easy fit, but it's big on all the Polk technology that makes it uniquely db: meaning you get legendary Polk sound at a terrific price.

Dynamic Balance® Driver Technology for pure, distortion free sound.
Neodymium is a rare earth material we use in all db driver magnets, excluding 461p, that are about 1/10 the weight of a comparable ceramic magnet and much more powerful.
Composite Cones feature tremendous stiffness-to mass ratio. Lower mass means faster transients and finer detail.
Klippel Optimized Components for consistent, distortion-free sound.
Marine Certified means the db351 is built tough to withstand the harshest environments on the water.