CHAPTER 2: THE MPS-488P POWER SUPPLY
10
NOTE: Since HMS-10s should only be con-
nected to channel outputs 1, 3, 5, and 7, only
the Load Current LEDs for channels with connected
loudspeaker will light up (unlike the Voltage LEDs,
which will all light up).
Fuse Slow Blow (1–8)
Each loudspeaker channel is protected with its own fuse. A
maximum of one HMS-10 can be connected to each of four
output channels (1, 3, 5, and 7); connecting more than that
could cause a channel’s fuse to trip.
NOTE: When replacing fuses, make sure to
use a 2-amp, 250-volt slow-blow fuse (T2A-
250V). These fuses are available from Meyer Sound
(PN 420.027).
THE MPS-488P REAR PANEL
The MPS-488P rear panel includes an AC connector, eight
channel inputs for receiving source audio, eight channel out-
puts for delivering DC power and balanced audio, and seven
Links switches for routing audio from inputs to outputs.
CAUTION: Because the MPS-488
P can power
a maximum of four HMS-10 loudspeakers, the
HMS-10s should only be connected to channel out-
puts 1, 3, 5, and 7. Do not use the even-numbered
channel outputs.
AC Input
The MPS-488P has a PowerCon twist-lock AC connector
(line, neutral/line, earth). The connector can accept different
power cord types for outlets used throughout the world.
Make sure to use the correct power cord for the AC power in
your area. The MPS-488
P operates at an AC voltage range
of 100–240 V at 50–60 Hz.
Channel Inputs
Up to eight channels of balanced audio are received from the
MPS-488
P’s eight channel inputs. The inputs are equipped
with XLR female connectors (pin 1, ground; pin 2, signal pos-
itive; pin 3, signal negative). Make sure to use standard bal-
anced XLR cables with all three pins connected on both ends.
Channel inputs default to being routed to their correspond-
ing channel outputs but can also be routed to adjacent out-
puts with the Link switches, though this affects their input
impedance (see “Input Impedance for Linked Channel
Inputs” on page 11).
Link Switches
Link switches determine how channel inputs are routed to
channel outputs. When a channel input’s Link switch is OFF
(set to the down position), the input is only routed to its cor-
responding channel output: for example, channel input 1
routed to channel output 1. When a Link switch is ON (set to
the up position), the input is routed to its corresponding
channel output and the next adjacent channel output: for
example, channel input 1 routed to channel outputs 1 and 2.
If multiple, adjacent Link switches are enabled, the input is
routed to each adjacent channel output: for example, chan-
nel input 1 routed to channel outputs 1, 2, and 3.
NOTE: Channel inputs are inactive when the
Link switch for their preceding channel input is
enabled. Connections should not be made to inactive
channel inputs.
Routing Audio Inputs with the Link Switches
The following examples illustrate the most common routing
applications for the MPS-488
P with four HMS-10s. The
MPS-488
P can power a maximum of four HMS-10s.
MPS-488P Power Supply Rear Panel
MPS-488P Channel Inputs
MPS-488
P Audio Input
