The larger HALO-A follows the same core design as the more compact HALO-C providing the signature EM Acoustics “maximum headroom” design approach that ensures consistency of performance regardless of SPL level. The compact enclosure (14.3/362 x 40.2/1020 x 24.4/619 in/mm) and low weight (145.2/66 lbs/kg) translates into less truck space used and smaller motors required.
The HALO-A utilizes a proprietary patent-pending emulation manifold, which combines the energy of four 3.4-inch diaphragm, 1.4-inch exit compressions drivers into a plane-wave array. This assembly gives not only a significant moving area for the high frequency section but also provides twice the headroom of comparable systems.
The HF section is flanked by a pair of high power 3.5-inch voice coil, 12-inch neodymium low frequency transducers. These two drive units combined with optimally-tuned low turbulence porting and generous cabinet volume ensure HALO-A has a low frequency performance to match the incredible highs.
A single HALO-A exhibits a flat, free-field frequency response from 48 Hz to 19kHz (+/-3dB) and a phase response which is +/- 20 degrees between 150Hz and 18kHz. Due to the unique loading technique applied to the low frequency drivers, combined with the high frequency waveguide, the dispersion pattern control is maintained down to 250Hz.
HALO-A requires two amplifier channels and makes use of the latest in FIR DSP technology requiring use of the EM Acoustics DQ20 advanced system amplifier. The enclosure (is constructed from premium 15mm (5/8-inch) and 30mm (1 3/16-inch) multi-laminate Baltic birch plywood, rebated, screwed and glued together for maximum strength. Intelligent bracing combined with low-loss porting structure minimizes panel flexure removing unwanted resonances while keeping the overall enclosure weight low, and the enclosure is finished in a weather-resistant polyurethane coating.
Each enclosure offers a simple and intuitive 3-point flying system, assembled from ultra-high tensile strength steel parts coated with Zylan for enhanced durability.