Alto M series Schematic

M-SERIES - STUDIO MONITORS

www.altoproaudio.com

Version 1.0

M3A/M4A/M5A

MODEL: M3/M4/M5

CONTENT

1. Warning ................................................................................................................................................. 2

2. Technical Specification........................................................................................................................ 3

3. Test Procedure & Test Result.........................................................................................................4-17

4. Block diagram................................................................................................................................18-19

5. Schematic diagram........................................................................................................................20-28

6. PCB Layout ....................................................................................................................................29-30

7. Exploded views & mechanical parts list......................................................................................31-45

1

1. WARNING

l Service must be carried out by ALTO qualified personnel only.
l Unqualified service personnel used in the warranty time of the product, produce a falling of the warranty.
l Schematic diagram and part list of the devices may be subject to change without immediate notice.
l When to replace any components, only with same size and same specification.
l The symbol used for the resistors are R (ohm) and for the capacitors are U (microfarad).

2

2. Technical Specification

M3 M4 M5

System type 2 way 2 way 2 way

Power Hanging AES 30W AES 70W AES 80W

SPL 1W, 1m 87dB 92dB 95dB

Frequency Response 50Hz-13kHz(-10dB) 40Hz-15kHz(-10dB) 40Hz-15kHz(-10dB)

Impedance 4Ohm 4Ohm 4Ohm

Crossover Frequency 2.3-3kHz(1m/W) 2.3-3kHz(1m/W) 2.3-3kHz(1m/W)

Dimension H×W×D 216.5×143.5×152.5mm 287.5×169×201mm 376×223.5×267mm

Net Weight/kg 2.4kg 4.8kg 6.6kg

M3A M4A M5A

System type 2 way 2 way 2 way
Power Hanging: HF AES 15W AES 30W AES 60W
LF AES 30W AES 60W AES 130W

SPL 1W, 1m 87dB 92dB 95dB

Frequency Response 50Hz-13kHz(-10dB) 40Hz-15kHz(-10dB) 40Hz-15kHz(-10dB)

Impedance 4Ohm 4Ohm 4Ohm

Crossover Frequency 2.3-3kHz(1m/W) 2.3-3kHz(1m/W) 2.3-3kHz(1m/W)

Dimension H×W×D 216.5×143.5×152.5mm 287.5×169×201mm 376×223.5×267mm

Net Weight/kg 3.6kg 6.5kg 8.3kg

3

3. Test Procedure and Test Result

1) Test equipment

Audio frequency x-over (VP-7724A)
Load connector
Oscilloscope
Amplifier (MACRO2400)

2) Test Procedure

M3 NEAR X-OVER TEST SPECIFICATION

a. IN: 1KHZ-15.3dBV to AMP, AMP VR MAX (RL=4Ω AMP OUT=10.4V). Connect AMP OUTPUT to fixture

INPUT and connect fixture OUTPUT to 4Ω. LF=7.3V, when testing OUTPUT must be normal.

b. IN: 5KHZ-15.3dBV to AMP, AMP VR MAX (RL=4Ω AMP OUT=10.4V). Connect AMP OUTPUT to fixture

INPUT and connect fixture OUTPUT to 4Ω. HF=2.9V, when testing OUTPUT must be normal.

M3 FAR X-OVER TEST SPECIFICATION

a. HF signal input 6KHZ-15.3dB. Output voltage is 3.24V.
b. LF signal input 1KHZ-15.3dB. Output voltage is 8.4V. When testing OUTPUT must be normal.

M4 NEAR X-OVER TEST SPECIFICATION

a. HF signal input 4KHZ-15.3dB. Output voltage is 2.85V.
b. LF signal input 1KHZ-15.3dB. Output voltage is 4.9V. When testing OUTPUT must be normal.

M4 FAR X-OVER TEST SPECIFICATION

a. HF signal input 5KHZ-15.3dB. Output voltage is 4.18V.
b. LF signal input 1KHZ-15.3dB. Output voltage is 7.34V. When testing OUTPUT must be normal.

M5 NEAR X-OVER TEST SPECIFICATION

a. HF signal input 7KHZ-15.3dB. Output voltage is 6.9V.
b. LF signal input 1KHZ-15.3dB. Output voltage is 5.17V. When testing OUTPUT must be normal.

M5 FAR X-OVER TEST SPECIFICATION

4

a. HF signal input 6KHZ-15.3dB. Output voltage is 6.03V.
b. LF signal input 1KHZ-15.3dB. Output voltage is 5.87V. When testing OUTPUT must be normal.

M3A PCB TEST SPECIFICATION

a. Turn on AC power 220V~230V after pushing PCB into fixture;
b. LF; Signal input: 1KHZ & 600Ω

MIC: -31dB±1dB
OUTPUT: 9.6V

c. HF; Signal input: 2KHZ & 600Ω

MIC: -43dB±1dB

OUTPUT: 9.2V

M4A PCB TEST SPECIFICATION

a. Turn on AC power 220V~230V after pushing PCB into fixture;
b. LF; Signal input: 1KHZ & 600Ω

MIC: -21dB±1dB
OUTPUT: 9.7V

c. HF; Signal input: 2KHZ & 600Ω

MIC: -43dB±1dB

OUTPUT: 7V

M5A PCB TEST SPECIFICATION

a. Turn on AC power 220V~230V after pushing PCB into fixture;
b. LF; Signal input: 1KHZ & 600Ω

MIC: -35dB±1dB
OUTPUT: 12.7V

c. HF; Signal input: 2KHZ & 600Ω

MIC: -29dB±1dB

OUTPUT: 12.5V

5

Test Result

Load

Ω

Model No.: M3A(LF) JFM-1006-5.0

Test Item Test Conditions Spec Test Result Remark
1 Power Source AC: 240V; 50Hz
2 Idle Current

3

Power

Consumption

4 Rated Output

Maximum at

5

Output 10% THD

6 Hum or Noise

DC V Load Ω

Rated Output.

Aux At 1KHz

Load 4Ω
Load 8Ω

Load 16Ω
Load Ω(25V)
Load Ω(50V)
Load Ω(70V)

Load Ω(100V)

Aux 1KHz -15 dB

Load 4 Ω

A A
A A

W W

10.05 V V

10.25 V V

10.38 V V
V V
V V
V V
V V

50 W W FLAT

VR Max (Tape On) 14.6 mV mV
VR Max (Tape Off) 0.4 mV mV

FLAT

Aux At 1KHz

FLAT.

Rated W

100Hz: dB 100Hz: dB

10KHz: dB 10KHz: dB

7

Tone control

Response

Input From Aux Output

At 1W

8 Puncture Voltage 5mA, 5Sec 3750V or 1500V

MONITOR

MONITOR NO:

Aux 1KHz dB

AUX1, 2, TAPE, TUNER

TAPE 6.3KHz-10dB MAX

TUNER AM/FM MAX

9

TEL.PAGING

PRIORITY MIC1

Aux 1KHz dB

Load Ω V

AUX1, 2, TAPE, TUNER

G-T dB;
G-R dB.

ZONE PAGING 100V ALL/Z1, Z2, Z3, Z4

AC: OUTPUT

REMOTE AC OUT or DC OUT

G-T dB;
G-R dB.

FLAT

FLAT

6

Model No.: M3A(LF) JFM-1006-5.0

1 2 3 4 5

Test Item

Test Conditions

Test Result

Input Sensitivity Signal/Noise Distortion at 1W

FLAT

Rated

Output 50 W

Load 4 Ω

FLAT

Rated

Output 50 W

Load 4 Ω

FLAT

Output

At 1W

Load 4 Ω

Distortion at Rated

FLAT

Rated

Output 50 W

Load 4 Ω

Frequency

Response

FLAT

Output at 1W

REF –3dB
Load 4 Ω

AUX dB dB % %

TAPE dB dB % %

AUX1

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

AUX2

TAPE dB dB % %

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

AUX3

TUNER dB dB % %

CD dB dB % %

B MIC -15dB 60dB 0.25% 0.13%

19.5HZ~20KHZ ↑

LINE dB dB % %

MIC-1

24V dB dB % %

UNBAL dB dB % %

19.3HZ~20KHZ ↑

MIC-2

U MIC -21dB 60dB 0.21% 0.14%

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

U MIC -21dB 60dB 0.23% 0.13%

19.3HZ~20KHZ ↑

LINE dB dB % %

MIC-3

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

MIC-4

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

MIC-5

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

Remark 1. Input at 1KHz

7

Model No.: M3A(HF) JFM-1006-5.0

Load

Ω

Test Item Test Conditions Spec Test Result Remark
1 Power Source AC: 240V; 50Hz
2 Idle Current

3

Power

Consumption

4 Rated Output

Maximum at

5

Output 10% THD

6 Hum or Noise

DC V Load Ω

Rated Output.

Aux At 1KHz

Load 4Ω
Load 8Ω

Load 16Ω
Load Ω(25V)
Load Ω(50V)
Load Ω(70V)

Load Ω(100V)

Aux 1KHz -30 dB

Load 4 Ω

A A
A A

W W

9.35 V V

9.53 V V

9.62 V V
V V
V V
V V
V V

44 W W FLAT

VR Max (Tape On) 17.3 mV mV
VR Max (Tape Off) 1.6 mV mV

FLAT

Aux At 1KHz

FLAT.

Rated W

100Hz: dB 100Hz: dB
10KHz: dB 10KHz: dB

7

Tone control

Response

Input From Aux Output

At 1W

8 Puncture Voltage 5mA, 5Sec 3750V or 1500V

MONITOR

MONITOR NO:

Aux 1KHz dB

AUX1, 2, TAPE, TUNER

TAPE 6.3KHz-10dB MAX

TUNER AM/FM MAX

9

TEL.PAGING

PRIORITY MIC1

Aux 1KHz dB

Load Ω V

AUX1, 2, TAPE, TUNER

G-T dB;
G-R dB.

ZONE PAGING 100V ALL/Z1, Z2, Z3, Z4

AC: OUTPUT

REMOTE AC OUT or DC OUT

G-T dB;
G-R dB.

FLAT

FLAT

8

Model No.: M3A(HF) JFM-1006-5.0

1 2 3 4 5

Test Item

Test Conditions

Test Result

Input Sensitivity Signal/Noise Distortion at 1W

FLAT

Rated

Output 44 W

FLAT

Rated

Output 44 W

FLAT

Output

At 1W

Load 4 Ω

Distortion at Rated

FLAT

Rated

Output 44 W

Frequency

Response

FLAT

Output at 1W

REF –3dB
Load 4 Ω

AUX dB dB % %

TAPE dB dB % %

AUX1

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

AUX2

TAPE dB dB % %

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

AUX3

TUNER dB dB % %

CD dB dB % %

B MIC -30dB 50dB 0.27% 0.29%

24.3HZ~32KHZ

LINE dB dB % %

MIC-1

24V dB dB % %

UNBAL dB dB % %

24.3HZ~32KHZ

MIC-2

U MIC -36dB 57dB 0.27% 0.14%

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

U MIC dB dB % %

LINE dB dB % %

MIC-3

24V dB dB % %

UNBAL dB dB % %

MIC -36dB 58dB 0.27% 0.14%

24.3HZ~32KHZ

LINE dB dB % %

MIC-4

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

MIC-5

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

Remark 1. Input at 1KHz

9

Model No.: M4A(LF) JFM-1006-5.0

Load

Ω

Test Item Test Conditions Spec Test Result Remark
1 Power Source AC: 240V; 50Hz
2 Idle Current

3

Power

Consumption

4 Rated Output

Maximum at

5

Output 10% THD

6 Hum or Noise

DC V Load Ω

Rated Output.

Aux At 1KHz

Load 4Ω
Load 8Ω

Load 16Ω
Load Ω(25V)
Load Ω(50V)
Load Ω(70V)

Load Ω(100V)

Aux 1KHz -13 dB

Load 4 Ω

A A
A A

W W

12.67 V V

12.90 V V

13.03 V V
V V
V V
V V
V V

80 W W FLAT

VR Max (Tape On) 13.6 mV mV
VR Max (Tape Off) 0.3 mV mV

FLAT

Aux At 1KHz

FLAT.

Rated W

100Hz: dB 100Hz: dB
10KHz: dB 10KHz: dB

7

Tone control

Response

Input From Aux Output

At 1W

8 Puncture Voltage 5mA, 5Sec 3750V or 1500V

MONITOR

MONITOR NO:

Aux 1KHz dB

AUX1, 2, TAPE, TUNER

TAPE 6.3KHz-10dB MAX

TUNER AM/FM MAX

9

TEL.PAGING

PRIORITY MIC1

Aux 1KHz dB

Load Ω V

AUX1, 2, TAPE, TUNER

G-T dB;
G-R dB.

ZONE PAGING 100V ALL/Z1, Z2, Z3, Z4

AC: OUTPUT

REMOTE AC OUT or DC OUT

G-T dB;
G-R dB.

FLAT

FLAT

10

Model No.: M4A(LF) JFM-1006-5.0

1 2 3 4 5

Test Item

Test Conditions

Test Result

Input Sensitivity Signal/Noise Distortion at 1W

FLAT

Rated

Output 80 W

Load 4 Ω

FLAT

Rated

Output 80 W

Load 4 Ω

FLAT

Output

At 1W

Load 4 Ω

Distortion at Rated

FLAT

Rated

Output 80 W

Load 4 Ω

Frequency

Response

FLAT

Output at 1W

REF –3dB
Load 4 Ω

AUX dB dB % %

TAPE dB dB % %

AUX1

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

AUX2

TAPE dB dB % %

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

AUX3

TUNER dB dB % %

CD dB dB % %

B MIC -13dB 51dB 0.23% 0.13%

19.2HZ~20KHZ ↑

LINE dB dB % %

MIC-1

24V dB dB % %

UNBAL dB dB % %

19.3HZ~20KHZ ↑

MIC-2

U MIC -19dB 60dB 0.22% 0.07%

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

U MIC -19dB 62dB 0.23% 0.11%

19.2HZ~20KHZ ↑

LINE dB dB % %

MIC-3

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

MIC-4

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

MIC-5

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

Remark 1. Input at 1KHz

11

Model No.: M4A(HF) JFM-1006-5.0

Load

Ω

Test Item Test Conditions Spec Test Result Remark
1 Power Source AC: 240V; 50Hz
2 Idle Current

3

Power

Consumption

4 Rated Output

Maximum at

5

Output 10% THD

6 Hum or Noise

DC V Load Ω

Rated Output.

Aux At 1KHz

Load 4Ω
Load 8Ω

Load 16Ω
Load Ω(25V)
Load Ω(50V)
Load Ω(70V)

Load Ω(100V)

Aux 1KHz -12 dB

Load 4 Ω

A A
A A

W W

12.66 V V

12.75 V V

13.07 V V
V V
V V
V V
V V

80 W W FLAT

VR Max (Tape On) 8.6 mV mV
VR Max (Tape Off) 0.2 mV mV

FLAT

Aux At 1KHz

FLAT.

Rated W

100Hz: dB 100Hz: dB
10KHz: dB 10KHz: dB

7

Tone control

Response

Input From Aux Output

At 1W

8 Puncture Voltage 5mA, 5Sec 3750V or 1500V

MONITOR

MONITOR NO:

Aux 1KHz dB

AUX1, 2, TAPE, TUNER

TAPE 6.3KHz-10dB MAX

TUNER AM/FM MAX

9

TEL.PAGING

PRIORITY MIC1

Aux 1KHz dB

Load Ω V

AUX1, 2, TAPE, TUNER

G-T dB;
G-R dB.

ZONE PAGING 100V ALL/Z1, Z2, Z3, Z4

AC: OUTPUT

REMOTE AC OUT or DC OUT

G-T dB;
G-R dB.

FLAT

FLAT

12

Model No.: M4A(HF) JFM-1006-5.0

1 2 3 4 5

Test Item

Test Conditions

Test Result

Input Sensitivity Signal/Noise Distortion at 1W

FLAT

Rated

Output 80 W

Load 4 Ω

FLAT

Rated

Output 80 W

Load 4 Ω

FLAT

Output

At 1W

Load 4 Ω

Distortion at Rated

FLAT

Rated

Output 80 W

Load 4 Ω

Frequency

Response

FLAT

Output at 1W

REF –3dB
Load 4 Ω

AUX dB dB % %

TAPE dB dB % %

AUX1

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

AUX2

TAPE dB dB % %

TUNER dB dB % %

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

AUX3

TUNER dB dB % %

CD dB dB % %

B MIC -12dB 58dB 0.28% 0.12%

25HZ~20KHZ ↑

LINE dB dB % %

MIC-1

24V dB dB % %

UNBAL dB dB % %

25.2HZ~20KHZ ↑

MIC-2

U MIC -18dB 63dB 0.19% 0.09%

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

U MIC -18dB 61dB 0.19% 0.07%

25HZ~20KHZ ↑

LINE dB dB % %

MIC-3

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

MIC-4

24V dB dB % %

UNBAL dB dB % %

MIC dB dB % %

MIC-5

LINE dB dB % %

24V dB dB % %

UNBAL dB dB % %

Remark 1. Input at 1KHz

13