Pioneer TS-WH500A Compact Series Dual 7-1/8" x 3-7/8" - 150 W Max Power - HVT (Horizontal Vertical Transforming) Sealed Active Subwoofer

HVT stands for Horizontal Vertical Transforming technology which transforms horizontal movement of a voice coil into vertical movement of a woofer diaphragm to produce true, powerful and wide-range bass in a very shallow, reduced depth structure. The TS-WH500A amplified subwoofer system is a truly groundbreaking approach in loudspeaker design. HVT technology uses a unique linkage mechanism, which allows the magnet and voice coil of the dual motor structure to be positioned horizontally to the left and the right side of vertically moving dual speaker diaphragms. Combined, the two diaphragms have an effective surface area equal to a conventional 8" subwoofer and fire in a bipolar arrangement, increasing output while also canceling destructive vibrations within the enclosure.

The result of this innovative technology is a subwoofer system with significantly reduced physical depth, while maintaining greater excursion and linearity for superior bass reproduction, natural sound quality and higher output.