Professional Series enclosures are built for drivers that push harder than the universal Performance Series lineup is designed around: high-excursion, high-power models where the baffle has to hold the motor still.
Construction is Langboard Elite MDF, 3/4" (18mm), CNC cut in Tullahoma, Tennessee, with CNC dado and V-groove joinery throughout. The front baffle is what separates this series: 1.5" dual-layer MDF on some models and 2.25" triple-layer on others, giving the mounting face the rigidity a long-throw driver needs. The terminal cup is a recessed Proline X ABS and carbon-fiber composite with stainless steel hardware and copper ring terminals. Warranty is two years against manufacturing defects.
Fifteen models are live, in 8", 10", 12", 13" and 15", twelve ported and three sealed, in single and dual driver configurations. All are standard-orientation cabinets. If the driver you are running is a competition or high-output model, this is the series to check before Performance Optimized.