HALO-A

Large format line array element

HALO-A

Large format line array element

Current
Compact, lightweight enclosure means less truck space and smaller motors
Two 12″ LF drivers, four 1.4″ exit HF compression drivers on a plane-wave array
Bi-amplified design for maximum efficiency with lower amplifier count
HALO Arena is designed to produce the same staggering results as HALO Compact, but in a package more suited to larger events. The same core design principle of the maximum headroom possible means that HALO Arena delivers a consistent performance across all SPL levels. HALO-A has been built for touring – but is equally at home in large format fixed installations
  • Signature EM Acoustics ‘maximum headroom’ design approach ensures consistency of performance regardless of SPL
  • Extremely consistent horizontal dispersion pattern across the operating frequency band
  • Enclosure coated with 3-step polyurethane process ensures weather-resistance and resilience to impact damage
  • Powder-coated corrosion-resistant steel grille
  • Intelligent internal bracing combined with unique low-loss porting structure
  • Black, white and RAL custom colour finish

A single HALO-A exhibits a flat, free-field frequency response from 48Hz 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.

Similarly to HALO-C, the high frequency device is a major factor in setting the system apart from its competitors. Unlike HALO-C, which utilises an AMT plane-wave drive unit, HALO-A uses compression drivers due to the much higher SPL required for these applications. However, HALO-A uses a proprietary emulation manifold, which combines the energy of four 3.4” (86mm) diaphragm, 1.4” (36mm) exit compression drivers into a plane-wave array. This assembly gives not only a very significant moving area for the high frequency section, but provides twice the headroom of other comparable systems. Viewed from another perspective, if running at the same SPL as a competitor system, HALO-A would run with 3dB less distortion due to the increased overall HF headroom.

Working alongside these four high frequency drivers are a pair of high power 3.5” (88mm) voice coil 12” (305mm) low frequency transducers. These two powerful drive units, combined with optimally-tuned low turbulence porting and generous cabinet volume ensure HALO-A has a low frequency performance to match the stunning highs. Keeping HALO-A as a two-way system reduces the off-axis parallax issues to a single crossover point, and through tireless research and development this issue has been almost completey eradicated.

The HALO Arena enclosure is constructed from premium 15mm and 30mm (⅝” and 1 3/16”) multi-laminate Baltic birch plywood – rebated, screwed and glued together for maximum strength. Intelligent internal bracing, combined with the unique low-loss porting structure minimises panel flexure – thereby removing unwanted resonances but still keeping the overall enclosure weight low. The enclosure is finished in a polyurethane coating, which as well as being far tougher than the conventional water-based paints used on other products, offers HALO-A a significant level of weather resistance without any further treatment.

The flying hardware has also been built with touring flexibility and reliability in mind. HALO-A uses a 3-point system, utilising quick releasepins as you would expect. Array angles can be pre-set on individual elements whilst stored on their transit chariots. As the array is lifted the rear links move to their pre-set array angles, and a final pin fixes everything in position. Ultra-high tensile steel parts form the core of the 3-point system, which is coated with XylanTM – a fluoropolymer coating which contains PTFE for both lubrication and impact resistance. Arrays of up to 24 elements can be safely assembled with above-regulation safety factors.

HALO-A requires two amplifier channels and makes use of the latest in FIR DSP technology – as such it must be used with either the DQ20 advanced system amplifier, or the APA-4E8 from XTA Electronics. Using either of these amplifiers a maximum of eight HALO-A enclosures could be driven from a single amplifier, although six is recommended as a maximum for full output.

Enclosure Type 2-way reflex loaded line array element
Components LF: 2 x 3.5” (88mm) voice coil neodymium 12” (305mm)
HF: 4 x 3.4” (86mm) diaphragm, 1.4” (36mm) exit neodymium HF drive units on bespoke plane-wave manifold
Dimensions (HxWxD), mm/(ins) 362 x 1020 x 619mm (14.3” x 40.2” x 24.4”)
Net/Shipping Weight 66/70kg (145.2/154lbs)
Frequency Response 48Hz – 19kHz ± 3dB
Phase Response ± 20°, 150Hz – 18kHz
Nominal Dispersion 80° horizontal
Splay Angles 0.25°, 0.5°, 1°, 1.5°, 2°, 2.5°, 3°, 4°, 5°, 6°, 7°, 8°
Maximum SPL 143dB continuous, 149dB peak
Cabinets per amplifier DQ6: 2 per amplifier, DQ10: 4 per amplifier, DQ20: 8 per amplifier**
Power Handling LF: 1400W RMS, 2800W program
HF: 400W RMS, 800W program
Nominal Impedance LF: 8 ohms
HF: 16 ohms
Crossover Asymmetric internal passive
Connectors 2 x Neutrik® speakON™ NLT4MP
Enclosure 15 & 30mm (⅝” and 1 3/16”) multi-laminate Birch plywood – rebated, screwed and glued together. Finished in polyurethane textured finish
Rigging Hardware 3-point system, ultra-high tensile steel. Enclosure hardware rated to 24 elements at 10:1 safety factor
Grille Powder coated corrosion-resistant steel
Accessories FG-HALO-A master flying grid
WB-HALO-A enclosure transit chariot
TC-HALO-A quad-enclosure padded touring cover

** Four HALO-A in parallel should only be used with short cable runs (less than 30m), and ideally a maximum of only 3 enclosures should be connected in parallel.

Applications

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Case Studies using this Product