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UG10555-2.0 - Tri Motion User Guide V2.0
7 Appendix
The loudspeaker shall be an active three-way bi-amped system consisting of one high power
15” (380 mm) isometric triangular horn loaded low frequency (LF) transducer with a two way
mid-high frequency section consisting of an 8” (200 mm) isometric triangular horn loaded
mid-high frequency (MHF) transducer and one 1.5” (38.1 mm) diameter exit high frequency
(HF) compression driver mounted on a waveguide. Both the LF and MHF transducers shall be
enclosed in separate and independent moulded fibreglass composite cabinet with a smooth
cellulose finish of any RAL colour.
The LF and MHF 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 MHF 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 its sound through a high precision wave-guide with
a 200 mm (8”) baffle to achieve pattern control and low distortion.
Performance specifications for a typical production unit shall be as follows: the usable on-
axis bandwidth shall be 120 Hz to 20 kHz (±3 dB) and shall average 60° directivity pattern on
the vertical axis and 90° on the horizontal one (-6 dB down from on-axis level) from 1 kHz
to 12 kHz. Maximum SPL shall be 141 dB peak measured at 1 m using IEC268-5 pink noise.
Crossover points shall be at 500 Hz and 1.4 kHz using 3rd order filters (18 dB per octave).
The system shall be powered by its own dedicated power amplification module with DSP
management. The wiring connection shall be via two Neutrik speakON™ NL4 (one for input
and one for loop-out to another speaker), to allow for pre-wiring of the connector before
installation.
The enclosures shall be bolted onto a powder coated steel frame using no less than four M8
bolts per horn. This frame aligns the horns in the correct acoustic space to achieve constant
directivity across the loudspeaker system’s entire dispersion. The frame will incorporate
mounting holes for a U bracket fixture for attaching to ceiling, wall and ground stack mounting
brackets. The external dimensions of the enclosures and frame shall be (W) 810 mm x (H) 515
mm x (D) 720 mm (31.9” x 20.3” x 28.3”). Weight shall be 47.1 kg (103.8 lbs).
The loudspeaker shall be the Void Acoustics Tri Motion.