A design combining superior operability & beauty. & introducing a new technology, Twisted Flare Port, for clear & tight bass. A subwoofer that will match a wide range of speakers & interiors. The all-new Twisted Flare Port takes advantage of extensive subwoofer development experience. The flared, gently twisting shape diffuses the vortex of air generated around the edge of the port, creating a smooth flow of air. This reduces extraneous noise not present in the original input signal & provides clear, accurate low frequency reproduction. From special effect sounds in movies to the atmosphere of a live venue, you hear bass that is clear, tight & realistic. The built-in power amplifier delivers stable power output of 130 W with high efficiency while minimizing power consumption & heat production. It does not require an output filter coil, resulting in extremely low noise & distortion. High speed transient response is also excellent. The dual feedback circuit reduces distortion by applying feedback twice, resulting in higher sound clarity.