The 8MB500 mid-bass transducer has been developed in response to a specific market requirement for a 200 mm (8 in) midbass driver which combines excellent linearity with good efficiency and power handling capabilities. It is primarily intended for use as a midbass driver in compact 2-way reflex enclosures with a 1 inch compression driver or tweeter but as a result of its versatile characteristics, it can also be used in multiway systems. The curvilinear, treated paper cone is formed using a unique wood pulp composition designed to achieve the best possible rigidity and stiffness. This is carried by a polycotton multiroll surround to provide increased excursion whilst controlling break up modes. The 50 mm (2 inch) aluminum wire voice coil employs same Interleaved Sandwich Voice coil (ISV) technology. It is composed of a high strength fiberglas former carrying windings on both the outer and inner surfaces to achieve a mass balanced coil. This results in an extremely linear motor assembly which, in conjunction with the highly advanced design of the magnetic structure, provides a high force factor or BL. The voice coil is cooled by incorporating airways between the chassis back plate and the magnetic top plate to channel heated air away from the voice coil and gap and dissipate it. In-house FEA CAD facilities have been used to optimise flux density and BL factor within the air gap. Due to the increasing use of sound systems at outdoor events, the 8MB500 ability to perform in humid environments is a key feature. This has been achieved using an exclusive cone treatment which renders the cone resistant to humidity. General Specifications Nominal Diameter200 mm (8 in) Rated Impedance8 Ohm AES Power280 W Program Power400 W Peak Power800 W Sensitivity95 dB Frequency Range60 - 4500 Hz Power Compression @-10dB0,5 dB Power Compression @-3dB1,4 dB Power Compression @Full Power2,3 dB Max Recomm. Frequency3000 Hz Recomm. Enclosure Volume10 - 40 lt. (0,35 - 1,41 cuft) Minimum Impedance5,8 Ohm at 25°C Max Peak To Peak Excursion19 mm (0,75 in) Voice Coil Diameter51 mm (2 in) Voice Coil winding materialaluminum SuspensionTriple-roll, Polycotton ConeCurvilinear, Treated cellulose Thiele Small Parameters Fs74 Hz Re5,1 Ohm Sd0,023 sq.mt. (35,65 sq.in.) Qms2,66 Qes0,51 Qts0,43 Vas21,5 lt. (0,76 cuft) Mms17 gr. (0,04 lb) BL9,0 Tm Linear Mathematical Xmax± 6 mm (± 0,24 in) Le (1kHz)0,60 mH Ref. Efficiency 1W@1m (half space)94,4 dB Mounting information Overall diameter210 mm (8,27 in) N. of mounting holes and bolt6 Mounting holes diameter6 mm (0,23 in) Bolt circle diameter195 - 198 mm (7,68 - 7,80 in) Front mount baffle cutout ø186 mm (7,32 in) Rear mount baffle cutout ø184 mm (7,24 in) Total depth99,5 mm (3,92 in) Flange and gasket thickness14,5 mm (0,57 in) Net weight3,4 kg (7,5 lb) Shipping weight3,72 kg (8,22 lb) Packaging Dimensions235 x 235 x 150 mm (9,25 x 9,25 x 5,91 in)
