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CHAPTER 2: THE MPS-488 POWER SUPPLY
12
Channel Outputs
The eight Channel Outputs deliver DC power (48 V DC) and
balanced audio to up to eight loudspeakers. Each Channel
Output can drive one MM-4XP loudspeaker and is equipped
with either Phoenix 5-pin male connectors (on the
MPS-488
P model) or EN3 5-pin male connectors (on the
MPS-488
E model).
CAUTION: When wiring cable connections for
the MPS-488 Channel Outputs, it is extremely
important that each pin in the connector is wired cor-
rectly. Make sure the 48 V DC from the MPS-488 is
wired directly (and only) to the 48 V DC pins on the
MM-4XP connector, and that the polarity is observed
(negative to negative, positive to positive) to avoid
damage to the loudspeaker. In addition, make sure
the audio pins are wired correctly; polarity reversals
for audio signals can affect system performance.
MPS-488P Channel Outputs
The MPS-488P Channel Outputs use Phoenix 5-pin male
connectors with three pins for balanced audio (positive,
negative, and shield) and two for DC Power (positive and
negative). These pins are clearly labeled on the MPS-488
P
rear panel. A single composite cable (such as Belden 1502)
wired for both DC power and balanced audio can be used to
connect to each MM-4XP.
Each MPS-488
P comes with eight Phoenix 5-pin female
cable connectors for assembling MM-4XP loudspeaker
cables. For information on MM-4XP cable requirements, see
“MM-4XP Current Draw and Cable Requirements” on
page 16. For information on cables and cable accessories
available from Meyer Sound, see Appendix B, “MM-4XP
Accessories.” For information on cable assembly, see
Appendix C, “MM-4XP Cable Assembly.”
MPS-488E Channel Outputs
The MPS-488E Channel Outputs use EN3 5-pin female con-
nectors with three pins for balanced audio (positive, nega-
tive, and shield) and two for DC Power (positive and
negative). These pins are clearly labeled on the MPS-488
E
rear panel. A single composite cable (such as Belden 1502)
wired for both DC power and balanced audio can be used to
connect to each MM-4XP.
Each MPS-488
E comes with eight EN3 5-pin male cable
connectors for assembling MM-4XP loudspeaker cables.
For information on MM-4XP cable requirements, see
“MM-4XP Current Draw and Cable Requirements” on
page 16. For information on cables and cable accessories
available from Meyer Sound, see Appendix B, “MM-4XP
Accessories.” For information on cable assembly, see
Appendix C, “MM-4XP Cable Assembly.”
MPS-488 CURRENT DRAW
The current that the MPS-488 and its connected loudspeak-
ers draw from its AC source (wall outlet or power distribution
system) is dynamic and fluctuates as operating levels
change. Since different cables and circuit breakers heat up
at varying rates, it is important to understand the following
types of current ratings and how they affect circuit breaker
and cable specifications.
■ Idle Current — The maximum rms current during idle
periods.
■ Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least 10 sec-
onds. The Maximum Long-Term Continuous Current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. This current rating is also used as a rat-
ing for slow-reacting thermal breakers.
MPS-488P Channel Outputs
!
MPS-488E Channel Outputs