The E12D-S is part of the Proline X economy line. They use MDF Ultralight with a single brace to keep things affordable. All Proline X subwoofer enclosures are hand built in the USA, precision CNC cut, with high quality terminal cups. The economy line features an interlocking design, rounded external edges, internally braced, all covered with grey trunk liner.

Why Proline X?

Proline X relies on over 30 years of industry experience and leadership to create high-quality subwoofer enclosures. Based in Northern California as a subsidiary of Audio Intensity, Proline X products are American-Made and a veteran employer.

Enclosures are CAD optimized, precision CNC cut, and assembled by hand with stringent quality control throughout assembly to completion. You won't find better boxes for the price anywhere.