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

D

wire connector

4 connectors

red and black wire

brown and black wire

5. Wiring Diagram

- 5 -

654321

C

B

A

MS15S

CROSSOVER

MS15S/18S

OUT+

RED

BLACK

IN+

OUT+

SPEAKER

+

15" WOOFER

HK07286

IN+

BROWN

-RS PC250*4

HA04676

100mm UL1015 18AWG

MS15S/

MS18S_IN

HB02154

HA02520

LOW+

HK05278

-

BLACK

750mm UL1015 18AWG

-RS PC250

LOW-

1 2 3 4 5 6

D

C

B

A

D

connector wire

red and black wire

4 connector

brown and black wire

- 6 -

654321

C

B

A

MS18S

CROSSOVER

MS15S/18S

OUT+

RED

BLACK

OUT+

HK07286

IN+

-RS PC250*4

HA04676

IN+

HB02154

SPEAKER

+

HK05278

-

18" WOOFER

BLACK

BROWN

100mm UL1015 18AWG

MS15S/

MS18S_IN

HA02520

LOW+

750mm UL1015 18AWG

LOW-

1 2 3 4 5 6

D

C

B

A

HB02154 MS15S-18S-IN-VER060606

6. PCB Layout

- 7 -

HB02153 

MS15S-18S-

VER060606

- 8 -

MS15S

7. Exploded View & Mechanical Parts List

- 9 -

MS18S

- 10 -

No. Item No. Item Description Specification PCS

Parts List

MS 15S

- 11 -

1 MG00457 black-plated screw-flat-iron plate M4*Φ8.9*50 16
2 NC01187 front panel MS 15S 462*441*18mm_V1.0 1
3 ND00749 EV foam 2.0t*300*40mm black _V1.0 2
4 ND00748 EV foam 2.0t*180*40mm _V1.0 2
5 MD00910 grille MS 15S_V1.0 1
6 MG00488 black-plated screw-flat-iron plate M3.5*15 10
7 MG00350 black-plated screw-T headφ10 M5*30 8
8 HK05278 woofer 15 Inch 300W 4Ω SR500SA(Z008288_LP385.75)1

9 ND00750 EV foam 2.0t*460*18mm black_V1.0 2
10 ND00635 EV foam 2.0t*700*15mm black_V1.0 2
11 MG00034 black-plated screw-flat-iron plate M4*16 20
12 MI02042 handle 220*163.5*63mm _V1.0 2
13 ND00634 EV foam 2.0t*300*15mm _V1.0 1
14 MG00353 black-plated screw M6*30 4
15 MH01704 mount ELVIS φ110*96_V1.0 1
16 NC01208 caninet MS 15S _V1.0 1
17 ND00635 EV foam 2.0t*700*15mm_V1.0 1
18 MG00351 black-plated screw-pill-iron plate M4*16 12
19 MI03747 fixed metal board MS15S ALTO _V1.0 1
20 ND00398 EV foam SR500A-SUB 1205.5*15*2 _V1.0 1
21 ND00747 EV foam 2.0t*420*18mm _V1.0 2
22 NI02426 rubber foot φ37*15.5mm 4
23 MG00454 black-plated screw-flat-iron plate M4*20 4

No. Item No. Item Description Specification PCS

MS 18S

- 12 -

1 MG00457 black-plated screw-flat-iron plate M4*Φ8.9*50 16

2 NC01199 front panel MS 18S 562*523*18mm_V1.0 1

3 ND00749 EV foam 2.0t*300*40mm _V1.0 5

4 MD00912 grille MS 15S_V1.0 1

5 MG00488 black-plated screw-flat-iron plate M3.5*15 12

6 MG00350 black-plated screw-T headφ10 M5*30 8

7 HK05278 woofer 15 Inch 300W 4Ω SR500SA(Z008288_LP385.75) 1

8 ND00750 EV foam 2.0t*460*18mm _V1.0 1

9 ND00635 EV foam 2.0t*700*15mm _V1.0 2
10 MG00034 black-plated screw-flat-iron plate M4*16 20
11 MI02042 handle 220*163.5*63mm _V1.0 2
12 ND00634 EV foam 2.0t*300*15mm _V1.0 1
13 MG00353 black-plated screw M6*30 4
14 MH01704 mount ELVIS φ110*96_V1.0 1
15 NC01208 caninet MS 15S _V1.0 1
16 ND00635 EV foam 2.0t*700*15mm _V1.0 1
17 MG00351 black-plated screw-pill-iron plate M4*16 12
18 MI03747 fixed metal board MS15S ALTO _V1.0 12
19 ND00398 EV foam SR500A-SUB 1205.5*15*2 _V1.0 1
20 ND00747 EV foam 2.0t*420*18mm _V1.0 1
21 NI02426 rubber foot φ37*15.5mm 4
22 MG00454 black-plated screw-flat-iron plate M4*20 4

No Part No. Description Specification Remark

8. BOM

MS 15S

- 13 -

1

NC01208 box-RS MS 15S_V1.0

2

NC01183 side cover board-RS MS 15S 583*572*18mm left_V1.0

3

NC00237 Plywood 2440*1220*18t_V1.0

4

NC01184 side cover board-RS MS 15S 583*572*18mm right_V1.0

5

NC00237 Plywood 2440*1220*18t_V1.0

6

NC01185 front faceplate-RS MS 15S 583*500*18mm_V1.0

7

NC00237 Plywood 2440*1220*18t_V1.0

8

NC01186 chassis-RS MS 15S 583*500*18mm_V1.0

9

NC00237 Plywood 2440*1220*18t_V1.0

10

NC01187 front board-RS MS 15S 462*441*18mm_V1.0

11

NC00237 Plywood 2440*1220*18t_V1.0

12

NC01188 front board-RS MS 15S 342*275*18mm_V1.0

13

NC00237 Plywood 2440*1220*18t_V1.0

14

NC01189 front faceplate-RS MS 15S 474*458*18mm_V1.0

15

NC00237 Plywood 2440*1220*18t_V1.0

16

NC01190 rear board-RS MS 15S 572*474*18mm_V1.0

17

NC00237 Plywood 2440*1220*18t_V1.0

18

NC01191 barrier-RS MS 15S 474*413*18mm_V1.0

19

NC00237 Plywood 2440*1220*18t_V1.0

20

NC01192 front board-RS MS 15S 418*120*18mm_V1.0

21

NC00237 Plywood 2440*1220*18t_V1.0

22

NC01193 shingle board-RS MS 15S 562*206*18mm_V1.0

23

NC00237 Plywood 2440*1220*18t_V1.0

24

NC01194 side cover board-RS MS 15S 562*127*18mm_V1.0

25

NC00237 Plywood 2440*1220*18t_V1.0

26

NI02426 foot cushion φ37*15.5mm

27

MG00454 screw-RS M4*20

28

MG00034 screw M4*16

29

MH01704 handle-RS ELVIS φ110*96_V1.0

30

MH00801 bracket φ110*96_V1.1

31

MG00353 screw-RS M6*30

32

MI02042 handle-RS 220*163.5*63mm _V1.0

33

ME00082 nut M5

34

ME00083 nut M6

35

AE00331 paint-RS PU CR-311 transparent

36

AE00332 PU-RS CR-311B

37

AE00368 paint CR36A

38

AE00369 solidification CR36B

39

AE00372 solvent R-7B

40

AE00370 paint CR52160A

41

AE00371 solidification CR-65TB-1

42

ND00634 EV foam--RS 2.0t*300*15mm black_V1.0

43

ND00635 EV foam--RS 2.0t*700*15mm black_V1.0
HK05278 woofer

44

15inch 300W 4Ω SR500SA(Z008288_LP385.75

No Part No. Description Specification Remark

-14 -

45

HG00177 voice coil-RS A09090A_BK 75-55-335/22*4P-3_V1.0
NH00345 cone

46
47

NH00237 cushion C0910A_GR 385/6+2

48

ND00485 spider D09140A_CT 75-165/12 C3 CONEX_V1.0

49

ND00525 dust-proof shade E06600A_CP 115/C

50

MH01983 T type middle pillar H08400A_PN 75/1800.10 F30_V1.2

51

MH01984 washer I08420A_PS 75/1800.10 SW F4_V1.1

52

MH01986 magnet-RS G04550A_D180*95*20 Y30_V1.0

53

MI02745 holder L08120B_CR 385/F4 N_V1.0

54

HC00426 terminal M0021B_PT2.1

55

HC00496 connect terminal 0.8*13*16.3mm

56

HC00495 connect terminal 0.8*13*16.3mm

57

NI02583 terminal block 3.5*24.5*3t

58

MH01110 rivet M0500A_OU-30

59

MD00642 grille SR500SA 0.5t*φ42.5*4H_V1.0

60

MD00712 grille SR500SA 0.5t*φ42.5*4H_V1.0

61

MD00643 grille 0.5t*70*70 SR500SA_V1.0

62

HA02494 strand TA4X4YKA42W*120mm

63

HA02079 strand TA4X4YKA42W*1M

64

NE16120 lable HK05278_V1.0

65

NI00014 membrane 0.035*1M

66

NH00012 bond paper 0.04*1M

67

MG00263 screw M5*8

68

MG00350 screw-RS M5*30

69

MG00457 screw M4*Φ8.9*50

70

MI03747 fixed board-RS MS15S ALTO _V1.0

71

MI03718 fixed bracket-RS MS 15S

72

AE00055 solvent solvent

73

AE00060 paint 4534

74

MI03717 fixed bracket-RS MS 15S_V1.1

75

ME00105 iron pillar M3*7.2*0.5PH_V1.1

76

MJ00088 single light board 1.5*2135*1220 30.67kg

77

ND00635 EV foam--RS 2.0t*700*15mm black_V1.0

78

HC00218 speakon SKCB201-4P

79

MG00042 screw M3*10

80

ME00015 color nut 3m/m

81

MG00488 screw-RS M3.5*15

82

MG00351 screw-RS M4*16

83

HB02154 PCB-RS MS15S/18S_IN_VER060606

84

HC00339 connect terminal 6.5m/m (PCF250)

85

HK07286 PCB board P-MS15S/18S
CF00229 metal-film capacitor-RS

86
87

CG00039 X2 capacitor MPX 0.47Uf/275V VDE/UL/CSA L=8mm C4

B08250A_U-SONIC CP312/32-SC348A/6-F_V1.0

47uF/250V ±10％

C1,C2,C3

No Part No. Description Specification Remark

- 15 -

88

HC00324 connect terminal 6.5m/m (PC250)

89

HB02153 PCB-RS MS15S/18S_VER060606
AE00449

90
91

MG00060 screw M3*6

92

HA02520 signle terminal wiring 750mm UL1015 18AWG

93

HA04676 wire-RS 100mm UL1015 18AWG

94

ND00398 EV foam SR500A-SUB 1205.5*15*2_V1.0

95

ND00747 EV foam-RS 2.0t*420*18mm black_V1.0

96

ND00748 EV foam-RS 2.0t*180*40mm black_V1.0

97

ND00749 EV foam-RS 2.0t*300*40mm black_V1.0

98

ND00750 EV foam-RS 2.0t*460*18mm black_V1.0

99

MD00910 grille-RS-CT MS 15S_V1.0

100

AE00440 dusty dope 3084G3

101

MD00909 grille-RS 310*180mm PH=12*5_V1.0

102

NA00296 PE bag 0.05t*1100*1300mm

103

NF02424 user manual MS SERIES ALTO_V1.1

104

NF00061 assurance card ALTO

105

NE16478 lable-RS MS15S_V1.0

106

NI00014 membrane 0.035*1M

107

NH00012 bond paper 0.04*1M

108

NE11345 label ALTO PG

109

NH00334 cone paper 0.040*1m

110

AD00012 twin adhesive 90*120mm_V1.0

111

NA00279 clip-chain bag 0.04t*100*150mm_V1.0

112

NE16477 lable-RS MS15S ALTO_V1.0

113

NA00590 bubble bag-RS MS15S_V1.0

114

NB04843 carton-RS MS15S ALTO_V1.0

115

NB04842 paper defend horn-RS MS15S 658*48mm_V1.0

116

AC00179 tin without lead-RS M705E Sn 3Ag-0.5Cu

solder material without lead

9308/Sn Ag Cu

IN+,OUT+

No Part No. Description Specification Remark

MS 18S

- 16 -

1

NC01209 box-RS MS 18S_V1.0

2

NC01195 side cover board-RS MS 18S 739*695*18mm left_V1.0

3

NC00237 Plywood 2440*1220*18t_V1.0

4

NC01196 side cover board-RS MS 18S 739*695*18mm right_V1.0

5

NC00237 Plywood 2440*1220*18t_V1.0

6

NC01197 front faceplate-RS MS 18S 695*600*18mm_V1.0

7

NC00237 Plywood 2440*1220*18t_V1.0

8

NC01198 chassis-RS MS 18S 695*600*18mm_V1.0

9

NC00237 Plywood 2440*1220*18t_V1.0

10

NC01199 front board-RS MS 18S 562*523*18mm_V1.0

11

NC00237 Plywood 2440*1220*18t_V1.0

12

NC01200 front board-RS MS 18S 350*350*18mm_V1.0

13

NC00237 Plywood 2440*1220*18t_V1.0

14

NC01201 front faceplate-RS MS 18S 576*574*18mm_V1.0

15

NC00237 Plywood 2440*1220*18t_V1.0

16

NC01202 rear board-RS MS 18S 739*574*18mm_V1.0

17

NC00237 Plywood 2440*1220*18t_V1.0

18

NC01203 barrier-RS MS 18S 574*447*18mm_V1.0

19

NC00237 Plywood 2440*1220*18t_V1.0

20

NC01204 barrier-RS MS 18S 574*85*18mm_V1.0

21

NC00237 Plywood 2440*1220*18t_V1.0

22

NC01205 front board-RS MS 18S 521*205*18mm_V1.0

23

NC00237 Plywood 2440*1220*18t_V1.0

24

NC01206 shingle board-RS MS 18S 729*210*18mm_V1.0

25

NC00237 Plywood 2440*1220*18t_V1.0

26

NC01207 side cover board-RS MS 18S 729*134*18mm_V1.0

27

NC00237 Plywood 2440*1220*18t_V1.0

28

NI02426 foot cushion φ37*15.5mm

29

MG00454 screw-RS M4*20

30

MG00034 screw M4*16

31

MH01704 handle-RS ELVIS φ110*96_V1.0

32

MH00801 bracket φ110*96_V1.1

33

MG00353 screw-RS M6*30

34

MI02042 handle-RS 220*163.5*63mm _V1.0

35

ME00082 nut M5

36

ME00083 nut M6

37

AE00331 paint-RS PU CR-311 transparent

38

AE00332 PU-RS CR-311B

39

AE00368 paint CR36A

40

AE00369 solidification CR36B

41

AE00372 solvent R-7B

42

AE00370 paint CR52160A

43

AE00371 solidification CR-65TB-1

44

ND00634 EV foam--RS 2.0t*300*15mm black_V1.0

No Part No. Description Specification Remark

- 17 -

45

ND00635 EV foam--RS 2.0t*700*15mm black_V1.0
HK06672 speaker-RS

46
47

MH02138 T-shape middle pillar-RS φ185*φ74.3*45.7*9_V1.1

48

MH02137 washer φ185*10_V1.0

49

MH02139 magnet φ190*φ89*20_V1.0

50

HC00882 terminal TPSALFA-18SUB_V1.0_V1.0

51

MI03470 bracket φ459.5*155.2_V1.0

52

ND00693 damper φ194*16_V1.0

53

NE15977 lable TPSALFA-18SUB_V1.0

54

NI00014 membrane 0.035*1M

55

NH00012 bond paper 0.04*1M

56

HG00217 voice coil BASV/4L φ74.88*55*3Ω*0.5_V1.0

57

NH00414 dust-proof shade φ139*17_V1.0

58

MD00642 grille SR500SA 0.5t*φ42.5*4H_V1.0

59

MD00712 grille SR500SA 0.5t*φ42.5*4H_V1.0

60

MD00643 grille 0.5t*70*70 SR500SA_V1.0

61

HA04553 line-RS TA2J7Y18H2KA33/42WB*1M

62

MG00264 screw M6*10

63

NH00415 cone-RS φ440*φ75.2*120_V1.1

64

NH00413 caushion 10*15.5 EVA black_V1.0

65

MG00350 screw-RS M5*30

66

MG00457 screw M4*Φ8.9*50

67

MI03734 fixed board-RS MS18S ALTO_V1.0

68

MI03718 fixed bracket-RS MS 15S

69

AE00055 solvent solvent

70

AE00060 paint 4534

71

MI03717 fixed bracket-RS MS 15S_V1.1

72

ME00105 iron pillar M3*7.2*0.5PH_V1.1

73

MJ00088 single light board 1.5*2135*1220 30.67kg

74

ND00635 EV foam--RS 2.0t*700*15mm black_V1.0

75

HC00218 speakon SKCB201-4P

76

MG00042 screw M3*10

77

ME00015 color nut 3m/m

78

MG00488 screw-RS M3.5*15

79

MG00351 screw-RS M4*16

80

HB02154 PCB-RS MS15S/18S_IN_VER060606

81

HC00339 connect terminal 6.5m/m (PCF250)

82

HK07286 PCB board P-MS15S/18S
CF00229 metal-film capacitor-RS

83
84

CG00039 X2 capacitor MPX 0.47Uf/275V VDE/UL/CSA L=8mm C4

85

HC00324 connect terminal 6.5m/m (PC250) IN+,OUT+

86

HB02153 PCB-RS MS15S/18S_VER060606

87

AE00449 solder material without lead 9308/Sn Ag Cu

18吋 500W 3Ω (TPSALFA-18SUB)

47uF/250V ±10％

C1,C2,C3

No Part No. Description Specification Remark

- 18 -

88

MG00060 screw M3*6

89

HA02520 signle terminal wiring 750mm UL1015 18AWG

90

HA04676 wire-RS 100mm UL1015 18AWG

91

ND00701 EV FOAM 1370*15*2.0mm

92

ND00746 EV foam-RS 2.0t*485*18mm black_V1.0

93

ND00751 EV foam-RS 2.0t*560*18mm black_V1.0

94

ND00749 EV foam-RS 2.0t*300*40mm black_V1.0

95

MD00912 grille-RS-CT MS 18S_V1.0

96

AE00440 dusty dope 3084G3

97

MD00911 grille-RS 310*280mm PH=12*5_V1.0

98

NA00522 PE bag-RS 0.05*1250*1600mm

99

NF02424 user manual MS SERIES ALTO_V1.1

100

NF00061 assurance card ALTO

101

NE16406 lable-RS MS18S_V1.0

102

NI00014 membrane 0.035*1M

103

NH00012 bond paper 0.04*1M

104

NE11345 label ALTO PG

105

NH00334 cone paper 0.040*1m

106

AD00012 twin adhesive 90*120mm_V1.0

107

NA00279 clip-chain bag 0.04t*100*150mm_V1.0

108

NE16407 lable-RS MS18S ALTO_V1.0

109

NA00587 silk wadding-RS MS18S_V1.0

110

NB04827 carton-RS MS18S ALTO_V1.0

111

NB04826 paper defend horn-RS MS18S 837*48mm_V1.0

112

AC00179 tin without lead-RS M705E Sn 3Ag-0.5Cu