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12mb600_image

Features

  • 101 dB SPL 1W / 1m average sensitivity
  • 75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
  • 450 W AES power handling
  • Weather protected cone and plates for outdoor usage
  • Excellent transient response
  • Improved heat dissipation via unique basket design
  • Ideal for compact two way and multiway systems
The 12MB600 is a high sensitivity (101dB 1W/1m) midbass driver with high power handling
capabilities. It can be used as either a bass/mid driver in compact 2-way reflex enclosures or as a
direct radiating or horn loaded, dedicated midrange driver, in multi-way touring and fixed
installation concert and arena systems. The curvilinear paper cone is made with a special high
strength wood pulp designed to achieve the best possible linearity within its intended frequency
range and to control bell-mode resonances around the cone circumference. The cone is carried
by a multiroll suspension formed from a linen-like material which is more resistant to aging and
fatigue than traditional materials. The 75 mm aluminum wire voice coil employs the Interleaved
Sandwich Voice coil (ISV) technology, in which a high strength fiberglas former carries windings
on both the outer and inner surfaces to achieve a mass balanced coil. This results in an
extremely linear motor assembly with a reduced tendency for eccentric behavior when driven
hard. Voice coil cooling has been achieved by incorporating airways between the chassis back
plate and the top plate of the magnet which allow heated air from the voice coil and gap to be
channeled away and dissipated by the chassis basket. The magnetic structure has been
optimized using FEACAD resource which has maximized the flux density in the voice coil gap. The
ability to perform properly under inclement weather conditions is a feature in Eighteen Sound's
philosophy. Hence, an exclusive treatment is applied to the cone giving it water repellent
properties. In addition, another special treatment is applied to the top and back plates making
the transducer far more resistant to the corrosive effects of salts and oxidization.

Specifications

Design

Parameters

Mounting and Shipping Info

  • Nominal Impedance8 Ω
  • Minimum Impedance6.5 Ω
  • Nominal Power Handling1450 W
  • Continuous Power Handling2600 W
  • Sensitivity3101.0 dB
  • Frequency Range58 - 5000 Hz
  • Voice Coil Diameter75 mm (3.0 in)
  • Recommended Enclosure50.0 dm3 (1.77 ft3)
  • Recommended Tuning55 Hz
  • Resonance Frequency44 Hz
  • Re5.0 Ω
  • Qes0.19
  • Qms3.9
  • Qts0.18
  • Vas115.0 dm3 (4.06 ft3)
  • Sd531.0 cm2 (82.31 in2)
  • Xmax4.5 mm
  • Mms43.0 g
  • Bl18.0 Txm
  • Le1.32 mH
  • EBP231 Hz
  • Overall Diameter315 mm (12.4 in)
  • Bolt Circle Diameter298 mm (11.73 in)
  • Baffle Cutout Diameter282.0 mm (11.1 in)
  • Depth147 mm (5.81 in)
  • Flange and Gasket Thickness16 mm (0.65 in)
  • Net Weight8.0 kg (17.64 lb)
  • Shipping Weight8.8 kg (19.4 lb)
  • Shipping Box332 x 332 x 184 mm (13.07x13.07x7.24 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.