as-418 Quad 18-inch Isobaric Subwoofer

as-418 Features

• Quad 18″ LF drivers with 4″ (100 mm) voice coils
• Dual isobaric configuration for extended low frequency response and compact footprint
• Very low second order harmonic distortion inherent in push / pull isobaric design
• 2400 W/4800 W, long term/program power handling
• Usable response down to 30 Hz
• Max long term output 134 dB SPL
• Multi-ply, cross-grain laminated birch construction
• Perforated steel grills with powdercoat finish
• Integrated handles and stacking skids

Applications

• Extending low frequency response for systems in: clubs, theaters, concert halls, houses of worship
• Dance Venues
• Portable and installed AV systems
• Live sound reinforcement
• Corporate AV

Like their full range counterparts, A Class subwoofers were designed specifically for working professionals seeking a better balance of performance, versatility and value.  The line provides options for adding low frequency impact to a broad range of sound reinforcement applications including houses of worship, theaters and auditoria, as well as portable PA for working bands, clubs or corporate events.

Every individual component inside the A Class subwoofers is optimized for each unique design. From transducers and cabinet architecture, to precision-tuned vents, crossovers and amplification, our team ensures that every element works at peak efficiency and in perfect harmony to deliver impactful and defined low frequency extension.

As the flagship of the A Class subwoofer family, the formidable as-418 installs four custom-engineered, 18-inch drivers into a compact enclosure comparable in size to most dual-18-inch subwoofer designs. Drivers are configured into a pair of front-to-front, isobaric (push-pull) configurations. The direct radiation from each front driver is combined with the output of the companion rear driver in a tuned vented enclosure. This Compound Force design enables more output and less distortion, while at the same time delivering four 18’s in an enclosure no larger than a typical dual 18-inch subwoofer.

Cut-A-Way showing the internal operations of the as-418′s isobaric design

The custom-engineered transducers inside the as-418 are equally unique. Each feature a large, 4-inch voicecoil and ceramic ferrite magnet. Ceramic is a much better choice for subwoofer application where extreme excursions generate operating temperatures that can easily demagnetize neodymium components over time.  By combining the large voice coil with a ceramic magnet structure, we increased power handling and decreased power compression, while ensuring reliable performance that would be consistent year after year under the most demanding conditions.

Pair of as-418′s on Castor Pallet

The as-418 features a robust, multi-ply birch enclosure with extensive interior bracing and dampening materials to reduce unwanted flex and resonant frequencies. The cabinet is protected by a rugged, industrial grade polyurethane finish while the front features a protective steel grill with a water resistant powder coating.  Integrated handles allow for easy portable use.

as-418 Dimensional Drawing