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MODEL: MICRO 3/3A/4/4A
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CONTENT
1. INTRODUCTION……………………………………………………1
2. TECHNICAL SPECIFICATION……………………………………2
3. BLOCK DIAGRAM & SCHEMATIC DIAGRAM…………………3
4. PCB LAYOUT………………………………………………………9
5. TEST PROCEDURE………………………………………………11
6. EXPLODED VIEW & MECHANICAL PARTS LIST… …………13
7. BOM………………………………………………………………...19

1. INTRODUCTION
This is a set of compact combination speakers. The MICRO series contain active
and passive models. MICRO 3A preamplifier is made with 2 JIM2068, one stereo
integrated circuit LM4766 in post circuit, signal RCA with left and right input and
the output power is 80/30 W. MICRO 4A preamplifier is made with 2 NJM2068,
one stereo integrated circuit LM4732 in post circuit, signal RCA with left and
right input and the output power is 50W. Light weight, compact dimension , easy
for installation. MICRO 3A/4A , the cabinet is made with PP rubber and 30%
exsiccator with black gravel paint on its surface. Use silk with YS-25 core ,4.2 Ω
for its treble, enjoying clear tweeter and strong woffer.
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IN THIS MANUAL:
1. INTRODUCTION.............................................................................................. 1
2. PANEL CONTROLS..........................................................................................1
3.. APPLICATIONS............................................................................................... 3
4. TECHNICAL SPECIFICATION............................................................................. 4
5. WARRANTY ................................................................................................... 5
1
1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by
purchasing MICRO series monitor.
The MICRO series is a set of portable passive/active speakers. This series
includes in MICRO3/3A & MICRO4/4A. Despite its compact dimensions, great
performances and sound quality are insured. Thanks to the specification of the
components used and the building quality. The Micro series monitors deliver
accurate, reliable sound. It is very suitable for studio, multimedia, and equally
powerful at home with your laptop .
MICRO series MonitorEnjoy your and make sure to read this Manual carefully
before operation!
4. TECHNICAL SPECIFICATION
4
2. PANEL CONTROLS
SPOTLIGHT
-. For MICRO series Passive Monitor Speakers: MICRO 3/4
This professional 6.3 MIC connector is used to connect with the MICRO active
monitor speakers or input the amplified high level program sources coming from
an external power amplifier.
(1) Input Connector
(1)
INPUT
MICRO 3
CONTINUOUS 30 WATTS
LTO
R
SERIAL
MODEL
MICRO 3
2Way
AES30W
87 dB
50 Hz-13 kHz (-10 dB)
8 Ohms
2.3-3 kHz (1m/W)
216.5 x 143.5 x 152.5 mm
2.21 kg
Model No.
System type
Power Handing
SPL (1W/1m)
Frequency Response
Impedance
Crossover Frequency
Dimension(HxWxD)
Net Weight (kg)
Model No.
System type
Power Handing
SPL (1W/1m)
Frequency Response
Impedance
Crossover Frequency
Dimension(HxWxD)
Net Weight (kg)
MICRO 4
2Way
AES60W
92 dB
40Hz-15 kHz (-10dB)
4 Ohms
2.3-3 kHz (1m/W)
287.5x169 x 201mm
4.63 kg
Model No.
System type
Power Handing: HF
Power Handing: LF
SPL (1W/1m)
AMP
Frequency Response
Impedance
Crossover Frequency
Dimension(HxWxD)
Net Weight (kg)
MICRO 3A
2Way
AES15W
AES30W
87 dB
50 W +50 W (extra) continuous EIAJ
50 Hz-13 kHz (-10 dB)
8 Ohms
2.3-3 kHz (1m/W)
216.5 x 143.5 x 152.5 mm
3.51 kg
Model No.
System type
Power Handing: HF
Power Handing: LF
SPL (1W/1m)
AMP
Frequency Response
Impedance
Crossover Frequency
Dimension(HxWxD)
Net Weight (kg)
MICRO 4A
2Way
AES30W
AES60W
92 dB
100 W +100 W (extra) continuous EIAJ
40 Hz-15 kHz (-10 dB)
4 Ohms
2.3-3 kHz (1m/W)
287.5 x 169 x 201 mm
6.41 kg
2. TECHNICAL SPECIFICATION
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123456
A B C D
654321
D C B A
R INPUT
L INPUT
VR104
D101
POWER
AC230V/50HZ
MICROM3A BLOCK
1
2
3
4
D1T
TRANS
SW
VR104
4O 4O
R? RES1
MICRO3A
Titel
Size
A3
Model No: MICRO3ARevision
VER070112
Date: 1-Mar-2007 Sheet 1
of1
File:
MICRO3A.SCHDrawn By:
Lv Ping Tang
- 3 -
3.BLOCK
OUTPUT
preamp1
preamp2
preamp1
preamp2

123456
A B C D
654321
D C B A
R INPUT
L INPUT
VR104
D101
POWER
AC230V/50HZ
MICROM4A BLOCK
1
2
3
4
D1T
TRANS
SW
VR104
4O 4O
R? RES1
MICRO4A BLOCK
Titel
Size
A3
Model No: MICRO4ABLOCK Revision
VER070112
Date: 1-Mar-2007 Sheet 1
of1
File:
Drawn By:
Lv Ping Tang
MICRO4A
- 4 -
preamp1
preamp1
preamp2
preamp2
OUTPUT

123456
A
B
C
D
654321
D
C
B
A
LOW SPEAKER
HI SPEAKER
T2
LOW BRIDGE+
T1
HI OUT+
T4
GND
T9
GND
L2
0.4MH
L1
0.2MH
C2
14U/100V
C1
6U/100V R1
6O/10W
T3
LOW BRIDGE+
T10
GND
MICRO3-X-1版
3c
5e
1a
4d
2b
J1
OUTPUT
LOW SPEAKER
HI SPEAKER
T2
LOW BRIDGE+
T1
HI OUT+
T4
GND
T9
GND
L1
0.35MH
R1
12O/10W
T3
LOW BRIDGE+
T10
GND
MICRO3-X-3OK版確認
3c
5e
1a
4d
2b
J1
OUTPUT
LOW SPEAKER
HI SPEAKER
T2
LOW BRIDGE+
T1
HI OUT+
T4
GND
T9
GND
L2
0.6MH
L1
0.35MH
C2
10U/100V
C1
1.5U/100V R1
6O/10W
T3
LOW BRIDGE+
T10
GND
MICRO3-X-2版
3c
5e
1a
4d
2b
J1
OUTPUT
MICRO 3-XOVER
Titel
Size
A4
Model No: MICRO 3-XOVER Revision
VER061221
Date: 1-Mar-2007 Sheet 1 of1
File: Drawn By: Lv Ping Tang
MICRO 3-XOVER(1/1)
HB02380 MICRO3-XOVER.SCH原理圖
SCHEMATIC DIAGRAM
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123456
A
B
C
D
654321
D
C
B
A
R60
1K
C62
0.1U
C70
68u/25V
-VEE
2VCC 27
-INA
15
+INA
16
MuteA
14
MuteB
20
+INB
22
-INB
21
VoA 7
GND 12
VoB 25
U3
LM4732
C66
10u/50V
C68
1000u/50V
R61
20K
R59
1K
R43
15K
C56
15P
R58
2.7O/2W
C64
0.1U
R57
2.7O/2W
C63
0.1U
R55
1K
C61
0.1U
C69
68u/25V CB00349
C65
10u/50V
C67
1000u/50V
R54
20K
R56
1K
R13
15K
C55
15P
C60
100u/35V
C59
100u/35V
R51
15K
R52
15k
C57
4.7u/25V
C58
4.7u/25V
A K
Z9
IN4737
Z10
IN4737
R14
30K
R8
10K
R19
10K
C1
10P
C5
33P
1
2
3
VR2
A10K
R15
56K
C4
4.7u/25V
C15
4.7u/25V
R20
1K
+15V
-15V
C17
33P
1
2
3
48
+
_
U2A
NJM2068LD
7
6
5+
_
U2B
NJM2068LD
R21
820E 1W
R22
820E 1W
C21
220u/25V
C22
220u/25V
Z12
IN4737
Z11
IN4737
+15V
R23
68K 0.5W
1
2
CN2
PL
T9
Vac
T10
GND
T1
Vac
C6
0.1u/275V
C24
4700u/50V
C23
4700u/50V
-Vc
+Vc
C20
0.1U
C18
0.1U
C7
0.1u
R17
1K
C8
0.1u
C3
0.15u
C16
0.15u
R16
2.2K
C10
102
C9
101
-15V
AC1 1
V+ 2
AC2
3
V-
4
BR2
BU10-04
AA K
KD3
IN4004
AA K
KD2
IN4004
+Vc
-Vc
T13
GND
T16
LOW BRIDGE+
R1
1O/10W
C2
4U/100V
C11
10U/100V
L1
0.2MH
L2
0.5MH
T12
GND
T11
GND
T14
HI OUT+
T15
LOW BRIDGE+
HI SPEAKER LOW SPEAKER
19
8
9
10
11
4
5
17
18
-Vc
+Vc
A K
Z13
IN4737
Z14
IN4737
R24
30K
R26
10K
R25
10K
C26
10P
C27
33P
1
2
3
VR2
A10K
R27
56K
C25
4.7u/25V
C33
4.7u/25V
R29
1K
C32
33P
1
2
3
48
+
_
U4A
NJM2068LD
7
6
5+
_
U4B
NJM2068LD
+15V
C29
0.1u
R30
1K
C31
0.1u
C28
0.15u
C30
0.15u
R28
2.2K
C34
102
C35
101
-15V 1,3腳信號輸入腳
5腳地
2,4.腳空腳
A1
B2
C3
D4
E5
J2
INPUT
A
1
B
2
C
3
D
4
E
5
J3
OUTPUT
MICRO 4A
Titel
Size
A4
Model No: MICRO 4A Revision
VER070127
Date: 1-Mar-2007 Sheet 1 of1
File: MICRO 4A VER061210.SCH
Drawn By: Lv Ping Tang
MICRO 4A(1/1)
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123456
A
B
C
D
654321
D
C
B
A
Z9
IN4737
Z10
IN4737
R14
15K
R8
10K
R19
10K
C1
10P
C5
33P
1
2
3
VR2
A10K
R15
56K
C4
4.7u/25V
C15
4.7u/25V
R20
1K
+15V
-15V
C17
33P
1
2
3
48
+
_
U2A
NJM2068LD
7
6
5+
_
U2B
NJM2068LD
R21
820E 1W
R22
820E 1W
C21
220u/25V
C22
220u/25V
Z12
IN4737
Z11
IN4737
+15V
R23
68K 0.5W
1
2
CN2
PL
T9
Vac
T10
GND
T1
Vac
C6
0.1u/275V
C24
4700u/50V
C23
4700u/50V
-Vc
+Vc
C20
0.1U
C18
0.1U
R30
1K
C7
0.1u
R29
1K
C36
470u/35V
C35
470u/35V
R33
47k15K可改為
R27
47K15K可改為
R17
1K
C8
0.1u
C38 CB00027
22U/25V
R32
1K
R37
20K
C42
100u/35V
Vcc A 2
OUT A 3
Vee
4
GND A
5
Mute A
6
-IN A
7
+IN A
8
U4A
LM4766
C43
470u/35V
C37 CB00027
22U/25V
R31
1K
R36
20K
C41
0.1U/100V
R41
2.7O/2w
C44
0.1U/100V
R42
2.7O/2w
C33
4.7u/25V
C34
4.7u/25V
C3
0.15u
C16
0.15u
R16
2.2K
C10
102
C9
101
-15V
AC1 1
V+ 2
AC2
3
V-
4
BR2
BU10-04
+Vc
+Vc
-Vc
AA K
KD3
IN4004
AA K
KD2
IN4004
1SPO+
1SPO-
OUT B 1
GND B
10
Mute B
11
-IN B
12
+IN B
13
Vcc B 15
Vee
4
U4B
LM4766
1,3腳信號輸入腳
5腳地
2,4.腳空腳
C45
10u/35V C46 0.1U/100V
C47
10u/35V C48
0.1U/100V
Z13
IN4737
Z14
IN4737
R34
15K
R44
10K
R35
10K
C51
10P
1
2
3
VR2
A10K
R38
56K
C49
4.7u/25V
C57
4.7u/25V
R39
1K
C56
33P
1
2
3
48
+
_
U3A
NJM2068LD
7
6
5+
_
U3B
NJM2068LD
+15V
C54
0.1u
R40
1K
C55
0.1u
C52
0.15u
C53
0.15u
R37
2.2K
C58
102
C59
101
-15V
C50
33P
A
1
B
2
C
3
D
4
E
5
J3
OUTPUT
A1
B2
C3
D4
E5
J2
INPUT
MICRO 3A
Titel
Size
A4 MICRO 3A VER070127
Date: 1-Mar-2007 Sheet 1 of1
File: MICRO 3A VER061210.SCH
Drawn By: Lv Ping Tang
File:
MICRO 3A(1/1)
- 7 -

- 8 -
4. PCB PLAYOUT

- 9 -

- 10 -

HK08294
MICRO 3A_230V
ITEM INPUT SENSITIVITY S/N INPUT DISTORTION FULL-POWER DISTORTION SIGNAL RESPONSE TERM RCA/L output 26Wload8ΩRCA/Loutput 26 Wload8ΩRCA/Loutput 1Wload8ΩRCA/Loutput 26Wload8ΩRCA/Loutput 1 Wload8Ω±3dB
RESAULT 1.0dB±0.8db 91dB↑0.05%↓1.2%↓110HZ↓~71KHZ↑
RCA/Routput 26Wload8ΩRCA/Routput 26 Wload8Ω RCA/Routput 1Wload8Ω RCA/Routput26Wload8Ω RCA/Routput 1Wload 8Ω±3dB
1.0dB±0.8db 87dB↑0.05%↓1.2%↓110HZ↓~71KHZ↑
MICRO 3A(ALTO) TEST REPORT
5.TEST PROCEDURE
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HK08293
MICRO 4A_230V
ITEM SENSITIVITY S/N DISTORTION FULL DISTORTION SIGNAL RESPONSE REMARK TERM
RCA/Loutput 38Wload
4Ω RCA/Loutput 38W
load4Ω RCA/Loutput1W
load4Ω RCA/Loutput 38W
load4Ω RCA/Loutput 1 Wload4
Ω±3dB setup set
RESULT 2.8dB±0.5db 79dB↑0.5%↓2.1%↓170HZ↓~1.7KHZ↑1:ATS-1*1PCS
RCA/Routput 50Wload
4Ω RCA/Routput 50 W
loadΩRCA/Routput 1W
load4Ω RCA/Routput50Wload
4Ω RCA/Routput 1W 4Ω±
3dB 2:oscillator*1PCS
1.7dB±0.5dB 78dB↑0.3%↓2.3%↓115HZ↓~68KHZ↑3:4Ω100Wload*1PCS
MICRO 4A(ALTO)TEST REPORT
- 12 -

- 13 -
MODEL
6.EXPLODED VIEW

- 14 -
MODEL

- 15 -
MODEL

- 16 -
MODEL

No. Part No. Description Specification PCS
1 HB02380 PC-BOARTD MICRO 3-VOXER-VER061221 1
2 HB02385 PC-BOARTD MICRO 3A-VOXER-VER061221 1
3 HB02386 PC-BOARTD MICRO 4A-VOXER-VER061221 1
4 MA06683 PANEL MICRO 3A ALTO-V1.0 1
5 MA06618 PANEL MICRO 3 ALTO-V1.1 1
6 MA06684 PANEL MICRO 4A ALTO-V1.0 1
7 MA06619 PANEL MICRO 4 ALTO-V1.1 1
8 NI04682 FAN 40*ψ21*74mm BLACK 1
9 MI04104 HEAT SINK MICRO3A 5t*22*93*57-V1.0 1
10 MI04106 FIXED BRACKET MICRO4A 1.2t*41*88*101.4-V1.0 1
11 MI04108 HEAT SINK MICRO4A 5t*22*93*88-V1.0 1
12 CN00230 NETWORK CIRCUIT 0.6mmH 0.18Ω(ψ1.0mm R10930) 1
13 NI03190 FIXED BRACKET MICRO4A 2.5*ψ94.4*ψ122-V.1.0 2
14 NI03189 FIXED BRACKET MICRO3A 2.5*ψ94.4*ψ122-V.1.0 2
15 NI04813 SPEAKER CABINET MICRO3 131.5*152.5*211.5-V1.0 1
16 NI04814 SPEAKER CABINET MICRO4 157*201*285-V1.0 1
17 NE17407 BAR CODE LABEL MICRO 4A BAR CODE 3
18 NE17406 BAR CODE LABEL MICRO 4 BAR CODE 3
19 NE17405 BAR CODE LABEL MICRO 3A BAR CODE 3
20 NE17404 BAR CODE LABEL MICRO 3 BAR CODE 3
21 MI01789 FIXED BRACKET MICRO 3A 1
22 SD00358 INTEGRATED CIRCUIT LM4732TA(TO220)/(NS) 1
23 NI04818 SPEAKER CABINET MICRO3A 131.5*152.5*211.5-V1.0 1
24 NI04817 SPEAKER CABINET MICRO4A 157*201*285-V1.0 1
25 HA04980 TERMINAL WIRING 100/360mm UL1007 18AWG WHITE 1
26 HA04982 TERMINAL WIRING 130*2/360mm UL1007 18AWG RED AND
BLACK FLAT WIRE 1
27 HB05270 OUTER WOODEN BOX MICRO 3A ALTO-V1.0 1
PARTS LIST
- 17 -

No. Part No. Description Specification PCS
28 HB05269 OUTER WOODEN BOX MICRO 4A ALTO-V1.0 1
29 HA05003 TERMINAL WIRING 130mm UL1007 18AWG WHITE 1
30 HA05004 TERMINAL WIRING 360mm UL1007 18AWG RED AND BLACK
FLAT WIRE 1
31 HA05005 TERMINAL WIRING 360mm UL1007 18AWG WHITE AND
BLACK FLAT WIRE 1
32 SD00357 INTEGRATED CIRCUIT LM4766T(TO220)/(NS) 1
33 RA01789 CEMENT RESISTOR 12Ω SQP MODEL 1
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