AUDAX Prestige 8 Hi-Fi Audax HM210Z2 HDA Aerogel Cone 70W 2x8? DUAL VOICE COIL (Each) High performance bass drive unit from the prestige range. Featuring a composite Aerogel cone and fully ventilated, die cast chassis / pole piece, this woofer operates as a pure piston upto 400 Hz with a ruler flat response - the bass output and quality is astonishing; alignments with a f3 of below 30 Hz easily achievable for a realistic in room response to around 20 Hz. This unit is not a subwoofer, it is designed for a stereo pair of the highest quality giving excellent texture, detail and extension. Twin edge wound voice coils can be configured for 4, 8 and 16 ohms. New old stock in original factory boxes - very, very rare. Audax were true innovators and released many cutting edge technologies never seen before such as the HDA (High Definition Aerogel) cone - a unique product based on acrylic polymer gel containing carbon and kevlar fibres in perfect molecular alignment. HDA was the product of extensive research for the perfect cone material that is both lightweight, rigid and displays high internal damping.Super high performance, HDA (High Definition Aerogel) cone with rubber surround. This 8 Bass driver was developed for top range, no-compromise high end 2 or 3-way systems. It features a die cast Zamak chassis with unobstructed venting for enhanced transient response and a non resonant phase plug for high end frequency equalization. High power handling results from the flat, edgewound copper coil mounted onto a fiberglass reinforced Kapton voice coil former. Unequaled definition is achieved over a wide spectrum of frequencies and dynamic ranges while retaining a neutral tonal balance with precise and detailed imaging.