Meyer Sound MILO 120 - Manual (Page 2)

Architect Specifications
About the Vertical Directivity Plots
The color images accompanying the upper diagram on the following page are sound
intensity plots made using the Meyer Sound MAPP Online
® acoustical prediction
program, a unique and highly accurate visualization tool for professional sound
system designers.
Using an Internet-connected personal computer, the
designer specifies Meyer Sound loudspeaker models,
their locations, how they are aimed and, optionally,
the locations and composition of walls. This
information travels over the Internet to a powerful
server computer at Meyer Sound headquarters in
Berkeley, Calif. Running a sophisticated algorithm and
using highly accurate measured data that describe
each loudspeaker’s directional characteristics, the
server predicts the sound field that the loudspeakers
will produce, forms a color representation, and sends
the result back for the designer’s computer to display.
In these sound field plots, the color spectrum is used
to represent levels of sound intensity, with red being
the loudest and blue the softest, as shown in the scale
to the immediate right. These examples illustrate
coverage characteristics for an array whose splay
angles have been tailored to the actual venue whose
section view is superimposed on the MAPP Online
plots.
The loudspeaker shall be a self-powered, full-range
unit for deployment in line array systems. The low/
low-mid frequency transducers shall consist of two
12-inch cone drivers, each rated to handle 1200 watts
AES*. The mid-high frequency transducer shall be
one 4-inch diaphragm (1.5-inch exit) compression
driver, rated to handle 250 watts AES, coupled via a
custom manifold to a 120-degree horizontal constant
directivity horn. The very-high frequency transducers
shall consist of two 2-inch diaphragm (0.75-inch exit)
compression drivers, each rated to handle 100 watts
AES, coupled via a custom manifold to a 120-degree
horizontal constant directivity horn.
The loudspeaker shall incorporate internal processing
electronics and a four-channel amplifier. Processing
functions shall include equalization, phase correction,
driver protection and signal division for the three fre-
quency sections. The crossover points shall be 560 Hz
and 4.2 kHz. An additional low-frequency crossover
shall cause the two low/low-mid frequency transduc-
ers to work in combination between 60 Hz and 180 Hz,
with only one working between 180 Hz and 560 Hz, to
maintain optimal polar response characteristics.
Each amplifier channel shall be class AB/H with com-
plementary MOSFET output stages. Burst capability
shall be (two channels 1125 watts, one channel 750
watts and one channel 560 watts) with a nominal 4-
ohm load for low and low-mid frequency channels, 6-
ohm load for very-high frequency channel and 8-ohm
load high-frequency channel. Distortion (THD, IM, TIM)
shall not exceed 0.02%. Protection circuits shall include
peak and TruPower limiting. The audio input shall be
electronically balanced with a 10 kOhm impedance and
accept a nominal 0 dBV (1 V rms, 1.4 V pk) signal (+20
dBV to produce maximum SPL). Connectors shall be
XLR (A-3) type male and female or VEAM all-in-one
(integrates AC, audio and network). RF filtering shall be
provided. CMRR shall be greater than 50 dB (typically
80 dB 50 Hz – 500 Hz).
Performance specifications for a typical production
unit shall be as follows, measured at 1/3 octave reso-
lution: Operating frequency range shall be 60 Hz to
18 kHz. Phase response shall be ±30° from 750 Hz to
16 kHz. Maximum peak SPL shall be 138 dB at 1 meter.
Beamwidth shall be 120 degrees horizontal. Vertical
coverage in multi-cabinet arrays shall be dependent
on system configuration; for a single cabinet vertical
coverage shall be 20 degrees.
The internal power supply shall perform automatic
voltage selection, EMI filtering, soft current turn-on
and surge suppression. Powering requirements shall be
nominal 100 V, 110 V or 230 V AC line current at 50 Hz
or 60 Hz. UL and CE operating voltage ranges shall be
95 to 125 V AC and 208 to 235 V AC. Current draw dur-
ing burst shall be 14.4 A at 115 V AC and 7.2 A at 230 V
AC. Current inrush during soft turn-on shall not exceed
7 A at 115 V AC. AC power connectors shall be locking
NEMA L6-20 connector, IEC 309 male or VEAM.
The loudspeaker system shall incorporate the elec-
tronics module for Meyer Sound’s RMS remote moni-
toring system.
All loudspeaker components shall be mounted in an
enclosure constructed of multi-ply hardwood with a
hard black textured finish. The front protective grille
shall be powder-coated, hex stamped steel.
Dimensions shall be 54.00” wide x 14.47” high (cabinet
front) x 22.00” deep (1372 mm x 368 mm x 559 mm).
Weight shall be 235 lbs (106.60 kg).
The loudspeaker shall be the Meyer Sound MILO 120.
*Loudspeaker driven with a band-limited noise signal with 6 dB
peak-to-average ratio for a period of two hours.
54.00" w x 14.47" h x 22.00" d
(1372 mm x 368 mm x 559 mm)
235 lbs (106.60 kg)
Multi-ply hardwood
Black textured
Powder-coated hex stamped steel
MRF-MILO rigging frame, custom AlignaLink
connectors and quick release pins Dimensions
Weight
Enclosure
Finish
Protective Grille
Rigging