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.
Mounting and Shipping Info
Nominal Diameter200 mm ( in)
Nominal Impedance8 Ω
Minimum Impedance5.8 Ω
Nominal Power Handling1280 W
Continuous Power Handling2400 W
Frequency Range60 - 4500 Hz
Voice Coil Diameter51 mm (2.0 in)
Surround ShapeTriple roll
Woofer Cone TreatmentWeather protected
Recommended Enclosure25.0 dm3 (0.88 ft3)
Recommended Tuning80 Hz
Resonance Frequency74 Hz
Vas21.5 dm3 ( ft3)
Sd230.0 cm2 (35.65 in2)
Overall Diameter210 mm (8.27 in)
Bolt Circle Diameter195 mm (7.68 in)
Baffle Cutout Diameter186.0 mm (7.32 in)
Depth99 mm (3.9 in)
Flange and Gasket Thickness14 mm (0.55 in)
Net Weight3.4 kg (7.5 lb)
Shipping Weight3.72 kg ( lb)
Shipping Box235 x 235 x 150 mm (9.25x9.25x5.91 in)
2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated minimum impedance. Loudspeaker in free air.
Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.