The loudspeaker shall be of the two-way passive type. It shall consist of a 5” (127mm) ceramic LF drive unit in an
infinite baffle enclosure, and a 1.1” (28mm) diaphragm HF soft dome drive unit. The two drive units shall be
linked via an internal asymmetric passive crossover network providing optimal frequency and phase responses.
The enclosure shall be constructed of premium multi-laminate Birch plywood and coated with a semi-matt textured
paint finish. This paint finish shall be black or white as standard, though can be RAL colour matched and may also
be provided with a weather resistant option. The front of the loudspeaker shall be protected by a powder coated
perforated steel grille.
The enclosure shall be trapezoidal in shape. The top, bottom and sides of the enclosure shall each incorporate a
single M8 threaded point for attachment of a variety of mounting and flying options. The enclosure shall be
supplied with both horizontal and vertical mounting yokes.
Two Neutrik SpeakON NL4MP connectors shall be provided on a rear connector plate for input and enclosure link.
The loudspeaker shall have a nominal dispersion pattern of 75° conical. The frequency response (+/-3dB) shall be
80Hz – 20kHz when measured on-axis. The maximum continuous SPL shall be 113dB, and the maximum peak SPL
(measured with pink noise with crest factor of 6) shall be 119dB. The loudspeaker shall have a power handling of
200W RMS, 400W program. The loudspeaker shall have a nominal impedance of 8 ohms.
The loudspeaker shall have maximum dimensions (HxWxD) of 250 x 140 x 175mm (9.9 x 5.5 x 6.9 inches) and a
net weight of 4.5kg (9.9bs).
The loudspeaker shall be the EM Acoustics EMS-51.
EM Acoustics Loudspeakers
Building 74, Dunsfold Park, Cranleigh, Surrey, GU6 8TB, UK
Phone +44 (0) 1483 266520 Fax +44 (0) 1483 275619
Architect & Engineer Specification