The BWX series uses a new cone that is a variation on the existing Kevlar® impregnated cones used on all Black Widows. The new cone is stronger and tougher, highly water re- sistant, and has a specially designed surround – a deep roll accordion design on the 15”, and an innovative asymmetrical-M style on the 12” that improves mid range clarity. The dust cap is also made of the same ex- tremely strong material.
Voice coil assemblies on the new drivers use the thermoset insulated aluminum or copper ribbon wire, bonded onto an incredibly durable, heat resistant polyimide composite former. The coil wires are solderless diffusion welded to high conductivity OFHC copper foil leads, which are embedded inside the former assem- bly and soldered to the tinsel leads with high temperature silver solder. The solder joint is then coated with a special thermally conductive silicone adhesive for encapsulation and heat dissipation.
The voice coil assembly is bonded to the Kevlar cone and new super tough nylon composite spider using a thermoset epoxy originally develop for attaching nose cones to ICBM missiles – truly an aerospace grade adhesive. The spider and surround are bonded to the frame with a high strength toughened adhesive.
The magnet structure includes subtle changes to its geometry that improve power handling. While it appears the same as the standard structure, and replacement basket from the BWX series will t on standard BW magnet structures, the improved power handling will be compromised if the standard structure is used.
These new drivers also adhere to the familiar features of Black Widow products: cast aluminum frames, re- placeable basket assemblies, Ruba- tex gaskets and high reliability, spring loaded terminals are all used.