Alto MS15S, MS18S Service Manual
MODEL: MS15S/MS18S
www.altoproaudio.com
Version 1.0
CONTENT
1. Introduction……………………………………………………..…………..1
2. Specification……………………..………………….……………………...2
3. Block Diagram……………………..…………..…………………...………3
4. Schematic Diagram…………….……………..…………………..….…….4
5. Wiring Diagram…………………….…………………..…...….…….……...5
6. PCB Layout……………………….……………..……….…...…….….…….7
7. Exploded View & Mechanical Parts List…………….…….…….……….9
8. BOM…………………………………………………….…...…..….……….…13
1. Introduction
- 1 -
MS series cabinets are designed for professional stage performance. This series
use high density plywood material for the body of the cabinet. With the accuracy
crossover frequency point makes the tone color more clear.
The power inside are as following:
MS15S/ Continuous 400Watts/800W Peak
MS18S/ Continuous 400Watts/800W Peak
It can match withMS12/MS15/MS152/MS153/MS154
All these characters made them very suitable for any place.
Model Item MS15S MS18S
S
2. Technical Specification
- 2 -
Passive System Type Band-Pass Band-Pass
Continuous Power 400Watt AES Standard 400Watt AES Standard
Peak Power 800Watt Peak 800Watt Peak
Max SPL 1mt 124dB SPL calculated 124dB SPL calculated
Frequency Response 45Hz / 200Hz at -10dB 35Hz / 200Hz at -10dB
Impedance Low - High 8 Ohm / 4 Ohm 4 Ohm / 8 Ohm
Crossover Frequency 250Hz Acoustical filter 250Hz Acoustical filter
Low Frequency Device 15" woofer / 3" voice coil 18" woofer / 3" voice coil
Connectors 2 x SPK4@Power Input / Output 2 x SPK4@Power Input / Output
Cabinet Multi-layer Plywood / Black painted Multi-layer Plywood / Black painted
Dimensions H x W x D H600 x W485 x D600 (mm) H730 x W600x D600 (mm)
Connectors 1/4" jack
Type R filtered, servo balanced input
AUDIO INPUT
AUDIO OUTPUT
YSTEM SPECIFICATIONS
INDICATOR Input level CLIP LED display: +7dbu
POWER SUPPLY
PHYSICAL
Impedance 30 Kohm balanced, 22 Kohm unbalanced
Max. input level +26 dBu balanced and Unbalanced
CMRR Typ.40db,>55db@1khz
Connectors 1/4" jack
Min. output impedance 100 Ohm
Max. output level +26 dBu balanced
Frequency response 10Hz to 30kHz, +/-1dB(FLAT)
S/N >110dB, unweighted, 22 Hz to 22kHz
THD 0.005% typ.@0 dBu, 1kHz,(unity gain), FLAT
USA/Canada 120V~, 60Hz
AC ADAPTOR
Power consumption 5W
Dimension 130(W) ×117(D) ×45(H)mm(5.1" ×4.6"× 1.7")
Net weigh 0.8 kg
U.K./Australia 240V~, 50Hz
Europe 230V~, 50Hz
D
3. Block Diagram
- 3 -
654321
C
B
A
SUB WOOFER SPEAKER
CROSSOVER CIRCUIT
MS15S/MS18S BLOCK DIAGRAM
S2B
SPK2
2-
1+
1-
INPUT
S1B
2+
2+
OUTPUT
2-
SPK1
1+
1-
1 2 3 4 5 6
D
C
B
A
D
4. Schematic Diagram
MS15S/18S PASSIVE CORSSOVER
- 4 -
4321
C
B
A
15" 4O
SUBWOOFER
P1
(BROWN)
-
-
LOW
(BLACK)
+
+
OUTPUT
+
P2
_
P3
P4
+
D
C1 47uF/250V
IN
C2 47uF/250V
C3 47uF/250V
C4
0.47uF/275V
_
1 2 3 4
C
B
A
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