Amplification And Protection Circuitry; Milo Interconnections; Cabling - Meyer Sound MILO Operating Instructions Manual

CHAPTER 2
Meyer Sound LD-1A, LD-2, or 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 array performance.
NOTE: For details on MILO's audio input
characteristics and amplification, see
Appendix B.

AMPLIFICATION AND PROTECTION CIRCUITRY

MILO is powered by the Meyer Sound HP-4/MILO amplifier,
a high-power four-channel amplifier (1125 watts/channel
with 4-ohm loads, and 560 watts with 8-ohm loads) with a
total power of 3935 watts. The HP-4/MILO amplifier utilizes
complementary-power MOSFET output stages (class
AB/H). All the specific functions for the MILO loudspeaker
such as crossover points, frequency and phase response,
and driver protection 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
response and can harm the drivers and amplifier.

MILO INTERCONNECTIONS

Each front 4-ohm, 12-inch, low-frequency cone driver is
powered by one 1125-watt channel of the HP-4/MILO
amplifier. The single 4-inch diaphragm, 8-ohm high-
frequency compression driver is powered by a single 560
watt channel and the three 2-inch diaphragm, 12-ohm very
high-frequency compression drivers share the fourth 1125-
watt channel. Figure 2.2 shows how MILO's drivers are
connected to the amplifier.
NOTE: For details on replacing the HP-4/
MILO amplifier see Appendix A.
10
Very High
Figure 2.2: MILO internal wiring harness diagram

CABLING

MILO is available with two different cabling/connection
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
connector per MILO 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
loudspeaker to act as a strain relief for cabling. Using this
fitting will minimize the chance of cables being damaged
during installation.
To utilize the strain relief fitting, insert the signal,
data, and AC connections into each loudspeaker as
the array is being rigged (swag all cables under the
rain hood's side flaps if installed), and tie the cables
off to the ring/stud fitting, as shown in Figure 2.3.
Figure 2.3: Cables are easily tied off using the rear ring/stud fitting.
Mid-High