18 Sound 8MB500 8" Mid-Bass Ferrite Transducer 8-Ohm 800 Watt Pro Audio Speaker.

18 Sound 8MB500 8" Mid-Bass Transducer 400 Watts 8-Ohm

Key Features

• 95 dB SPL 1W / 1m average sensitivity
• 51 mm (2 in) Interleaved Sandwich Voice coil (ISV)
• 400 Watt program power handling
• Triple roll suspension for increased motion control
• Weather protected treated cellulose cone
• Lightweight diecast aluminum basket design
• Suitable for compact two way and multiway systems

Description

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 Diameter

• 200 mm (8 in)

Rated Impedance

• 8 Ohm

AES Power

• 280 W

Program Power

• 400 W

Peak Power

• 800 W

Sensitivity

• 95 dB

Frequency Range

• 60 - 4500 Hz

Power Compression @-10dB

• 0,5 dB

Power Compression @-3dB

• 1,4 dB

Power Compression @Full Power

• 2,3 dB

Max Recomm. Frequency

• 3000 Hz

Recomm. Enclosure Volume

• 10 - 40 lt. (0,35 - 1,41 cuft)

Minimum Impedance

• 5,8 Ohm at 25°C

Max Peak To Peak Excursion

• 19 mm (0,75 in)

Voice Coil Diameter

• 51 mm (2 in)

Voice Coil winding material

• aluminum

Suspension

• Triple-roll, Polycotton

Cone

• Curvilinear, Treated cellulose

Thiele Small Parameters

Fs

• 74 Hz

Re

• 5,1 Ohm

Sd

• 0,023 sq.mt. (35,65 sq.in.)

Qms

• 2,66

Qes

• 0,51

Qts

• 0,43

Vas

• 21,5 lt. (0,76 cuft)

Mms

• 17 gr. (0,04 lb)

BL

• 9,0 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 diameter

• 210 mm (8,27 in)

N. of mounting holes and bolt

• 6

Mounting holes diameter

• 6 mm (0,23 in)

Bolt circle diameter

• 195 - 198 mm (7,68 - 7,80 in)

Front mount baffle cutout ø

• 186 mm (7,32 in)

Rear mount baffle cutout ø

• 184 mm (7,24 in)

Total depth

• 99,5 mm (3,92 in)

Flange and gasket thickness

• 14,5 mm (0,57 in)

Net weight

• 3,4 kg (7,5 lb)

Shipping weight

• 3,72 kg (8,22 lb)

Packaging Dimensions

• 235 x 235 x 150 mm (9,25 x 9,25 x 5,91 in)