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.