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CHAPTER 2: THE MPS-488P POWER SUPPLY
The MPS-488P power supply delivers DC power and bal-
anced audio to Meyer Sound loudspeakers that require a
48 V DC external power supply. The MPS-488
P is a multi-
channel, switched-mode, regulated power supply that occu-
pies one space in a standard 19-inch rack. The MPS-488
P
was originally designed for use with the MM-4XP miniature
loudspeaker. While the MPS-488
P can power up to eight
MM-4XPs, it can only power up to four HMS-10s (because
of the HMS-10’s additional current draw).
NOTE: The MPS-488 power supply is available
in two models: the MPS-488
P, which is
equipped with Phoenix 5-pin male output connectors
(recommended for use with the HMS-10), and the
MPS-488
E, which is equipped with EN3 5-pin female
output connectors.
THE MPS-488P FRONT PANEL
The MPS-488P front panel includes a power switch, LEDs
for monitoring each loudspeaker channel, and fuses for
each channel.
AC Power
The MPS-488P is powered on and off with the AC Power
switch.
Voltage and Load Current LEDs (1–8)
The Voltage and Load Current LEDs are useful for verifying
whether each channel output has voltage and whether the
connected loudspeakers are receiving DC power and audio.
Voltage LEDs (1–8)
The blue Voltage LEDs indicate whether voltage is present
for each channel output. These LEDs should be lit when the
MPS-488
P is powered on. If a channel is not lit, its fuse may
need to be replaced. If a group of two Voltage LEDs is not lit
(1–2, 3–4, 5–6 or 7–8), one of the four MPS-488
P internal
power supplies may have failed.
Load Current LEDs (1–8)
The green Load Current LEDs indicate whether a loud-
speaker is connected to the channel and receiving power.
As a channel’s audio signal increases, its LED glows
brighter. If an LED is not lit, check that the channel’s Voltage
LED is lit (the fuse is working) and verify the cable connec-
tion to the loudspeaker.
MPS-488P with Four HMS-10s
MPS-488P Power Supply Front Panel
MPS-488
P Channel LEDs and Fuses
