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Operating Instructions
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
MPS-3
Control
Electronics
Unit
The Meyer Sound
MPS-3 is an active sig-
nal processor de-
signed for use with
Meyer Sound MPS-305
and MPS-355 loud-
speakers. It is a ste-
reo device, and occu-
pies a single 1
3
/4 -inch
rack space. The func-
tions of the MPS-3
are:
• Loudspeaker fre-
quency and phase
response alignment
• SpeakerSense™ driver
protection
• Low frequency cut for
system equalization
Once all connections have been made and verified, the
system is ready to operate.
• The MPS-3 Output Level controls should be set at
minimum.
• Switch on AC to the MPS-3 first, then to the power
amplifier.
• Set power amplifier level controls (if any) to maximum.
Operation
• Advance the MPS-3 Output Level controls to set
system sensitivities. If the system is not operating
properly, recheck all connections
Note. The Output Level control markings are merely a
visual aid and should not be used to balance two systems.
The output of the MPS-3 is calibrated only when the Output
Level control is fully clockwise.
The MPS-3 operates at line level, and is designed to be the
last component in the signal chain before the power ampli-
fier. Connections to the MPS-3 should be made according
to diagram A.
1. Signal Inputs to the MPS-3 should be balanced XLR
male and, for best signal-to-noise ratio, have an average
input level of at least 1 volt RMS. The MPS-3 will accept
peak inputs of up to +26 dBV.
2. SpeakerSense connections are made between the
output of the power amplifier and the MPS-3 Sense inputs.
This connection must be made in order for the
SpeakerSense driver protection circuitry to operate prop-
erly. The power amplifier should provide a gain of 26 dB
(±6 dB) for optimum performance.
Note. Polarity of the Sense connections does not matter,
however it is important to verify that these connections are
consistent from Sense input to amp output. (i.e. Channel A
Sense to Amp Channel A output.)
3. Signal Outputs from the MPS-3 are active balanced, at
nominal +4 dBV operating level. The connectors may be
wired balanced or unbalanced, with maximum output levels
before clipping of +26 dBV balanced, +20 dBV unbalanced.
4. Connections between the power amplifier outputs and
the Meyer Sound MPS-305 or MPS-355 loudspeakers
should be made according to the instructions for the loud-
speaker. These connections must be verified for correct
polarity.
Connections