User manual B&W 808 BROCHURE

[. . . ] [. . . ] Yet it is capable of high sensitivity and well able to withstand the high currents involved. The Ferrofluid between the coil and pole piece cools the critical voice coil. q The problems posed by the necessary large enclosure of the 808 are met by the closed box system of utmost rigidity. To defeat coupling with the larger bass enclosure, a quarter-wave transmission line rear-loading system in incorporated. q Two 11in bass drive units operating within an enclosure of 220 litres fulfil both the bass extension and sound pressure level requirements. To achieve 91dB efficiency in the bass extension computer predictions indicate a fourth order alignment vented system and 808's drivers are optimised around this design. Drive Units 1 x TX32 high-frequency dome tweeter 2 x 100mm Midrange frequency drive unit 2 x 300mm low frequency drive units Dimensions Height: 1050mm and 1113mm with plinth; 1122mm with wheels and plinth Width: 653 Depth: 510mm without grille 542mm with grille Frequency Response 30Hz to 20kHz ±2dB Sensitivity 91dB spl(2. 83V 1m) Finish Walnut, teak, black ash, light oak or rosewood Nominal Impedance 8 ohms Power Handling No upper limit on midrange and tweeter due to automatic protection circuits. [. . . ] [. . . ]