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MPS-3 Control Electronics Unit
MPS-3 Control Electronics Unit
MPS Series 3 loudspeakers are designed to operate with
the MPS-3 Control Electronics Unit. A two-channel unit op-
erating at line level, the MPS-3 is the final component in
the signal chain before the power amplifier.
Optimized for Series 3 loudspeakers and aligned at the
factory, the MPS-3 comprises frequency and phase response
alignment circuitry, and Meyer Sound's SpeakerSense™
driver protection circuitry, with both peak and RMS signal
limiting. Complementary phase equalization in the MPS-3
gives the Series 3 loudspeakers flat frequency response with
outstanding phase characteristics.
SpeakerSense protects the Series 3 drivers from damage
due to overheating under continuous high power condi-
tions. Through a Sense connection to the power amplifier
outputs, this unique circuit continuously monitors the
power applied to the loudspeaker, and limits the signal out-
put when the safe operating limits of the loudspeaker are
exceeded. Until the onset of overload, the SpeakerSense cir-
cuit has no effect on the signal.
MPS-305 Architect's and Engineer's Specifications
The ultra-compact reinforcement speaker system shall
be a passive 2-way type with a 5-inch low-frequency loud-
speaker front mounted in a hardwood plywood enclosure
and a high-frequency piezo-electric driver mounted on a
2"x 5" horn. The enclosure shall be fitted with four
threaded mounting points, and shall operate with a sepa-
rate Control Electronics Unit.
The speaker system combined with a 125W (8 ohm rat-
ing) amplifier shall meet the following performance crite-
ria: Frequency response, 70 Hz to 20 kHz 4dB measured
in half space at 1 meter on axis with pink noise at
resolution ; output of 102 dB SPL measured at 1 meter on
axis with peaks of 112 dB SPL when driven with "A"-
weighted noise. Distribution pattern, 80 H by 60 V.
Speaker enclosure dimensions shall be 6
x 7" D, weight 6.6 lbs (3 kg).
The speaker enclosure shall be the Meyer Sound
MPS-305.
MPS-355 Architect's and Engineer's Specifications
The ultra-compact reinforcement speaker system shall
be a passive 3-way type with two 5-inch low-frequency loud-
speakers, front mounted in a ducted bass-reflex plywood en-
closure with a high-frequency piezo-electric driver
mounted on a 2" x 5" horn. The enclosure shall be fitted
3
with four
⁄
"–16 threaded mounting points, and shall oper-
8
ate with a separate Control Electronics Unit.
The speaker system combined with a 125W (16 ohm rat-
™
Power
A
B
Sense / Limit
3
⁄
"–16
8
1
⁄
octave
3
3
⁄
" W x 10
1
⁄
" H
4
2
Stereo
Flat
Mono
Lo Cut
2
Input Type
Output Type
Maximum Input/Output Level
1
Unbalanced
Balanced
2
Hum and Noise
Driver Protection Circuitry
Indicators
Sense/Limit
Power
Controls
Connectors
Balanced Input/Output
Sense
Power
Physical Dimensions
Weight
Note 1:
1 kHz, 10k ohm load, <0.1% THD.
ing) amplifier shall meet the following performance crite-
ria: Frequency response, 60 Hz to 20 kHz 4dB measured
in half space at 1 meter on axis with pink noise at
resolution; output of 108 dB SPL measured at 1 meter on
axis with peaks of 118 dB SPL when driven with "A"-
weighted noise. Distribution pattern, 80 H by 60 V.
Speaker enclosure dimensions shall be 6
7" D, weight 11 lbs (5 kg).
The speaker enclosure shall be the Meyer Sound
MPS-355.
MPS-3 Architect's and Engineer's Specifications
The Control Electronics Unit shall contain a power sup-
ply capable of 120/240V AC 50/60 Hz operation, equaliza-
tion for amplitude and phase alignment, protection cir-
cuitry which activates under high power conditions, RMS
limiter to protect the speakers from overheating, active bal-
anced input, push-pull output, and LED indicators for
power on and limiters. Total harmonic distortion at
+22dBu at the balanced output loaded with 10k
less than .1% at 1kHz. The "A"-weighted noise level shall be
at least 100 dB below maximum rated output of +22 dBu.
Control Electronics Unit dimensions shall be 19" W x
1
3
⁄
" H x 7
3
⁄
" D, weight 7lbs (3.2 kg).
4
4
The Control Electronics Unit shall be the Meyer Sound
MPS-3.
© 1994 Meyer Sound
A
B
4
6
4
6
8
2
8
0
10
0
10
Output Level
Active balanced, 24k ohms
Push-pull, 200 ohms output Z
>+16 dBu
>+22 dBu
<-85 dBV
RMS and peak limiters
Bicolor (grn/red) LEDs
Green LED
Output Levels. Power, Stereo/
Mono and Lo Cut switches
3-pin XLR (A-3) type
Banana jacks
120/240V AC, 50/60 Hz, 15 watts
3
3
19" W x 1
/
" H x 7
/
" D
4
4
7 lbs (3.1 kg)
Note 2:
"A" weighted, unbalanced.
1
⁄
octave
3
3
⁄
" W x 18" H x
4
shall be
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
04.014.008.01 A2
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