A154WVL
The A154WVL is designed to provide powerful verbatim reproduction of all usable audio frequencies below 1000 Hz. Recommended crossover is 500 Hz with a slope not too steep. The rigid piston assembly and efficient electromagnetic characteristics of this transducer result in crisp reproduction of the lowest audio frequencies, without 'hangover' or boom. The speakers have 4" diameter voice coils of edgewound copper ribbon. The large, specially wound voice coil is coupled to a stiff, straight-sided cone. High electro-acoustic efficiency is achieved by centering the voice coil in a precisely machined magnetic gap of high flux density. These powerful drivers have none of the 'muddy', 'burbling' quality associated with less efficient designs.
Model A154WVL matches a source impedance of 8 ohms. The frame is a rigid aluminum casting. This eliminates the disagreeable resonances which occur in stamped frames, and maintains the voice coil in perfect alignment with the magnetic gap. These transducers may be used as drivers for compression-loaded folded horns, such as the Hartsfield, or in a reflex or rear-loading horn enclosure such as C43 and C55 as well. The high acoustic loading of properly matched reflex and horn-type enclosures results in the greatest possible acoustic efficiency – hence fidelity – down to the lowest musical frequencies. To realize the clean, crisp quality which characterizes these bass drivers, they should not be mounted in resonant, tuned pipe, or 'air coupler' type cabinets. Properly installed, these transducers have no equal in natural reproduction of the vital bass frequencies.
