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Alto
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MS15A
Service Manual
48 pgs4.42 Mb1

Alto MS12A, MS15A, MS152A Service Manual

MODEL: MS12A / MS15A / MS152A
www.altoproaudio.com
Version 1.1
CONTENT
1.Introduction....................................................................................................1
2.Specification...................................................................................................2
3.Block Diagram.................................................................................................3
5.Wiring Diagram.............................................................................................10
6.PCB Layout...................................................................................................17
7.Exploded View & Mechanical Parts List.........................................................20
8.BOM..............................................................................................................27
1. Introduction
- 1 -
Thank you very much for expressing your confidence in LTO products by purchasing MS series powered speaker system. The MS series cabinets are specifically designed for using in hi-quality performance site and the precise sound commercial place. It includes five full range cabinets (MS12A, MS15A, MS152A, MS153A, and MS154A).This series uses trapezium configuration which greatly decreases the resonance of the standing wave in the cabinet. These cabinets uses hi-density matrix spray-paint technics and the bottom bracket design which make mounting quickly and Flexibly. HF compression driver and vented LF for fully professional performance.
The MS powered speaker cabinets include some exclusive innovations such as switch mode power supply and digital power circuitry (in selected modes) that make them the lightest powered cabinets of this kind ever made. The MS full range models include another Alto innovation: The MODELLER. Thanks to this circuitry user can
select 16 different tastes and applications. The Alto Modeller offers sound presets especially thought for application
with or without subwoofer, for voice optimised application, for Disco Music, for jazz, for Rock & Roll among
others. Although the operation of MS series speaker system is very simple, to obtain the optimal effects please
read this manual carefully before operation.
The excellent quality MS series -powered speaker cabinets will provide the following features:
Trapezium configuration decreases the resonance of the standing wave in the cabinet
The cabinets using hi-density matrix spray-paint technics
The bottom bracket design makes mounting quickly and flexibly
HF compression driver and vented LF for fully professional performance
With modeller include have which are suitable
Switch mode power supply and digital power circuitry
16 "sound mode " for different tastes and applications
2. Technical Specification
Model Item
Active System Type
Low Output Power
High Output Power
Max SPL 1mt
Frequency Response
Protection Low - High
Input Impedance
Input Sensitivity
Low Frequency Device
High Frequency Device
Coverage( H x V )
Connectors
Cabinet
External Control
Dimensions( H x W x D)
Net Weight (lbs/kg)
Model Item MS152A
Active System Type
Low Output Power
High Output Power
Max SPL 1mt
Frequency Response
Protection Low - High
Input Impedance
Input Sensitivity
Low Frequency Device
High Frequency Device
Coverage(H x V )
Connectors
Cabinet
External Control
Dimensions H x W x D
Net Weight (lbs/kg)
MS12A MS15A
2-Way Bi-Amp. with MODELLER
350 Watt EIAJ
65Watt EIAJ
122dB SPL calculated EIAJ
MODELLER Presets Setting
Analog Limiter
30k Balanced / 15k Unbalanced
Line +4dB
12" woofer / 2" Voice Coil
1" Neodymium Driver / 1" Voice Coil
90 H x 60 V Elliptical Wave Guide
Input with Combo / Link with XLR
Trapezoidal Shape / Composite Wood / Metal Handle / Black Paint Finishing
MODELLER with 16 Preset / Line Volume/ Clipping LED Indicator / Ground Switch
650 x 400 x 365 (mm)
48.50lbs/22kg
2-way Bi-Amp. with MODELLER
350Watt EIAJ
65Watt EIAJ
126dB SPL Calculated EIAJ
MODELLER Presets Setting
Analog Limiter
30k Balanced / 15k Unbalanced
Line +4dB
2 x 15" Woofer / 2.5" Voice Coil
1" Driver / 1.35" Voice Coil
90 H x 60 V Elliptical Wave Guide
Input with Combo / Link with XLR
Trapezoidal Shape / Multi-layer Plywood/ Metal Handle / Black Paint finishing
MODELLER with 16 Preset / Line Volume/ Clipping LED Indicator / Ground Switch
1100 x 450 x 443 (mm)
83.29lbs/37.78kg
2-way Bi-Amp. with MODELLER
350Watt EIAJ
65Watt EIAJ
123dB SPL Calculated EIAJ
MODELLER Presets Setting
Analog Limiter
30k Balanced / 15k Unbalanced
Line +4dB
15" woofer / 2.5" Voice Coil
1" Neodymium Driver / 1" Voice Coil
90 H x 60 V Elliptical Wave Guide
Input with Combo / Link with XLR
750 x 450 x 420 (mm)
59.52lbs/27kg
- 2 -
3. Block Diagram
Reverse the tweeter
- 3 -
K-panel
D
K-panel
inductor
reverse the tweeter
- 4 -
C
B
A
1/1
4321
+
_
+
_
_
+
MS15 WOOFER1
CN00061
4.2 mH
RED
BLACK
MS15 WOOFER2
BLUE
BLACK
DRIVER PA-DE34
MS152A BLOCK DIAGRAM
+
_
LOW
D
C
+
HK07641
MS152A
_
HIGH
B
1 2 3 4
A
D
Reverse the tweeter
K-panel
- 5 -
C
B
A
1/1
4321
+
_
MS15 WOOFER
BLACK
BROWN
BLUE
_
BLACK
+
DRIVER PA-D597NH
MS15A BLOCK DIAGRAM
+
_
LOW
D
C
+
HK07639
MS15A
_
HIGH
B
1 2 3 4
A
D
- 6 -
4
C
B
A
SIGNAL LIMIT
G
SPEAKER
3
5
6
HIGH OUT 65W/4
LOW OUT 350W/4
+12V
GND
-12V
3 4
SIGNAL SENSE
SW1
3
4
4BIT ENCODER
1
2
POWER MODEII
HIGH IN
A0 A1 A2 A3
HIGH OUT
2
LOW IN
LOW OUT
XOVER
POWER_CONNECT
2
POWER LED
INPUT GAIN
G
4
5
6
SW2B
1
2
3
1
X1
X2
X3
MIC INPUT
A
BAL-FEMALE
D
4
6
3
5
B
1
2
T
R
S
X1X2X3
BAL-MALE
LINE INPUT
SW2A
MIC2
C
P P
+12V
B
A
1
4. Schematic Diagram
- 7 -
- 8 -
- 9 -
D
5. Wiring Diagram
- 10 -
C
B
A
4321
1/1
WOOFER MS12 6.3O
_
+
(BROWN)
+
P3
(BLACK)
_
P4
MS12 LOW 150/300W
Hi O/P
P3
PTC1
(BLUE)
0.5A/60V
OUT OF PHASE
DRIVER
1" PA-D597NH 8O
+
_
(BLACK)
+
_
HI
P4
+
_
LPF
SIGNAL INPUT
AMP
R1
10R/20W
DS2
I2V 2.1A
_
+
HPF
1 2 3 4
D
C
B
A
D
- 11 -
C
B
A
1/1
4321
OUT OF PHASE
WOOFER MS 15 6O
WOOFER MS 15 6O
DRIVER PA-DE34
_
+
(BROWN)
_
+
P1
MS15 LOW1 250/300W
+
LPF
(BLACK)
P2
_
4.2mH(IRON) f1.2mm
L1
(RED)
+
P3
(BLACK)
_
+
_
MS15 LOW2 250/300W
+
_
(BLUE)
HI
+
P4
P5
(BLACK)
_
P6
_
SIGNAL INPUT
D
AMP
C
HPF
+
1 2 3 4
B
A
D
wire connector
wire connector
brown
inductor
wire connector
red
black
wire connector
blue
reverse the tweeter
- 12 -
C
B
A
1/1
4321
SPEAKER 1
+
WOOFER 1
HA04958
HK06399
-
-R S PC250
CN00061
SPEAKER 2
4.2 mH
+
650mm UL1015 18AWG
RED
HK06399
-
WOOFER 2
-R S PC250*2
HA04883
BLACK
DRIVE
SPEAKER
-
HG00082
+
PA-DE34
UL1015 18AWG 900mm/800mm
MS152A
D
BLUE
-R S PC250
HA04882
UL1015 18AWG 900mm/650mm
+
+
_
LOW
HK07641
C
_
HIGH
BLACK
-R S PC250*2
HA04884
B
1400mm UL1015 18AWG
1 2 3 4
A
D
- 13 -
C
B
A
4321
1/1
WOOFER MS15 6O
_
+
(BROWN)
+
P3
(BLACK)
_
P4
MS15 LOW 150/300W
Hi O/P
P3
PTC1
(BLUE)
+
0.5A/60V
OUT OF PHASE
DRIVER
1" PA-D597NH 8O
+
_
(BLACK)
_
HI
P4
+
_
LPF
SIGNAL INPUT
AMP
R1
10R/20W
DS2
I2V 2.1A
_
+
HPF
1 2 3 4
D
C
B
A
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