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UG10521-2.0 - Air Stream User Guide V2.0
7 Appendix
Architectural specifications
The loudspeaker shall be an active, three-way, bi-amped system consisting of a high power
15” (381 mm) direct radiating reflex loaded Low frequency (LF) transducer with a passive two
way mid-high frequency section consisting of a 12” (305 mm) horn loaded mid frequency
(MF) transducer and a 1.5” (38.1mm) diameter exit, coaxial high frequency (HF) compression
driver mounted on a user rotatable waveguide, in an aesthetic designed enclosure.
The LF and MF transducers shall be constructed on a cast aluminium frame, with a treated
paper cone, 63.5 mm (4”) for the LF and 50.8 mm (2”) for the MF voice coil, wound with
copper wires on a high quality voice coil former for high power handling and long-term
reliability. The HF transducer shall project it’s sound through a user rotatable waveguide
with a 200 mm (8”) baffle diameter.
Performance specifications for a typical production unit shall be as follows: the usable on-
axis bandwidth shall be 54 Hz to 20 kHz (±3 dB) and shall average 45° directivity pattern on
the vertical axis and 70° on the horizontal one (-6 dB down from on-axis level). Maximum
SPL shall be 133 dB peak (127 dB continuous) measured at 1m using IEC268-5 pink noise.
Power handling shall be 700 W AES for the LF at a rated impedance of 8
Ω
and 500 W
AES for the MHF at a rated impedance of 8
Ω
. The system shall be powered by its own
dedicated power amplification module with DSP management. The wiring connection shall
be via one Neutrik speakON™ NL4.
The enclosure shall be of a special fibreglass composite with a smooth cellulose finish of
any RAL colour. It shall contain fixture points for a pressed, weather-resistant, steel powder-
coated grille with foam filter to protect the low frequency transducer. The system shall be
stack mounted or can also be flown with a dedicated bracket. (W) 511 mm x (H) 743.5 mm x
(D) 499 mm (20.1” x 29.3” x 19.6”). Weight shall be 42.5 kg (93.7 lbs).
The loudspeaker shall be the Void Acoustics Air Stream.
