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CHAPTER 3
NOTE: Meyer Sound LD-3 line drivers are
highly recommended when driving systems
using multiple loudspeakers. These line drivers, in
addition to maintaining signal integrity for long cable
paths, offer independent outputs and filters to help
you integrate sub-systems and optimize MILO/MILO
120 array performance.
NOTE: For details on audio input character-
istics and amplification, see Appendix B.
AMPLIFICATION AND PROTECTION CIRCUITRY
MILO 120 is powered by the Meyer Sound HP-4/MILO 120
amplifier, a high-power four-channel amplifier (1125 watts/
channel with 4-ohm loads, 750 watts with 6-ohm loads and
560 watts with 8-ohm loads) with a total power of 3560
watts. The HP-4/MILO 120 amplifier utilizes complemen-
tary MOSFET output stages (class AB/H). All the specific
functions for the MILO 120 loudspeaker such as crossover
points, frequency and phase response, and driver protec-
tion are determined by the control card installed inside the
HP-4 amplifier.
All Meyer Sound loudspeakers are tested and shipped with
the drivers in correct alignment. However, if a driver needs
to be replaced, make sure the replacement is reinstalled
with the correct polarity.
CAUTION: Failure to connect a replacement
driver using the proper polarity will result in
severe degradation in frequency and phase re-
sponse and can harm the drivers and amplifier.
MILO 120 INTERCONNECTIONS
Each front 4-ohm, 12-inch, low-frequency cone driver is
powered by one 1125-watt channel of the HP-4/MILO
120 amplifier. The single 4-inch diaphragm, 8-ohm high-
frequency compression driver is powered by a single 560
watt channel and the two 2-inch diaphragm, 12-ohm very
high-frequency compression drivers share the fourth 750-
watt channel. Figure 3.2 shows how MILO 120’s drivers are
connected to the amplifier.
NOTE: For details on replacing the HP-4/
MILO 120 amplifier see Appendix A.
Figure 3.2. MILO 120 internal wiring harness diagram
CAUTION: Please note that MILO 120 and
MILO amplifiers are different. Specific func-
tions for each model, such as crossover points, fre-
quency and phase correction and driver protection
are determined by the control cards installed inside
the amplifier. Do not exchange amplifiers between
MILO and MILO 120 loudspeakers.
CABLING
MILO 120 is available with two different cabling/connec-
tion options. One is the Meyer Sound/VEAM cable system,
which combines AC power, audio signal, and RMS network
data into one heavy-duty cable with a single matching con-
nector per MILO 120 cabinet.
The other (standard) system uses three separate cables
and connectors per cabinet for the AC line current, signal,
and RMS data. However, the three can be consolidated to
create a “multi-cable” by looming them together for quick
connection to each cabinet. This ensures no patching errors
and a minimum of discrete cables behind the array.
A ring/stud fitting is provided on the rear of the MILO 120
loudspeaker to act as a strain relief for cabling. Using this
fitting will minimize the chance of cables being damaged
during installation.