This bad boy slips easily into a door and like all db loudspeakers delivers the awesome sound quality people have come to expect from Polk Audio. Of course db521 comes with the full complement of exclusive Polk features that make the it an exceptional value for the 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 db521 is built tough to withstand the harshest environments on the water.
Wheel-inspired style combines with rugged durability in the db grille.