Bowers Wilkins Matrix 804 loudspeakers $1400.00 These speakers are in excellent condition. These British designed speakers are very coherent and balanced with crisp highs and solid bass, making them well-rounded performers for all genres of music and movies. They are working flawlessly and in overall excellent cosmetic condition. MATRIX 804 The Matrix 804 contain an upper bass/midrange unit in Kevlar - a B&W innovation and a Cobex cone bass unit with a modified matrix 801 tweeter mounted on top of the enclosure. A 165 mm 96-1/2") Kevlar coned bass/midrange driver unit, incorporating a 30 mm (1-1/8") high-temperature voice coil on Kapton former. Kevlar cone drivers are employed to produce a unique break-up pattern which enables the speakers response to roll-off in a controlled manner above their working range. Kevlar's unusual directional weave induces a lergely self-cancelling resonant pattern across the cone.air is moved around close to the surface but no intrusive output is produced by the resonance. In consequence the Kevlar cone bass/midrange driver offers up a significantly more neutral sound with higher information retrieval. The Cobex cone lower bass driver is optimised for bass frequencies as its performance is confined to below the lower midrange. A specially formulated rubber surround enhances both drivers performance giving higher electrical/mechanical damping ratios, resulting in a more accurate and faster sound when reproducing bass transients. At high frequencies, the modified Matrix 801 tweeter incorporates magnetic fluid cooling to damp any unwanted resonances leading to noticeably smoother response, and in the process, more than doubling the tweeter's power handling. The tweeter's position on top of the enclosure provides a spaciousness of image not found in many other loudspeakers.