Alto PS-2, PS-2A Schematic
MODEL: PS 2/2A
www.altoproaudio.com
Version 1.0
1. Introduction
PS2
PS2A
- 1 -
These cabinets is designed for professional stage performance . The special
handle shows unique Italy style. With the accurate crossover point made the
timbre very clean.
It adopt special horn in polypropylene reinforced. With wide directional angle
90°H ± 45°V ( 1kHz - 16kHz), and PS 2TW AES 150Watt PEAK 300Watt .
Matching the 10” 6 Ohm 80-160W woofer with 15W 8 Ohm tweeter made the
acoustics of the cabinet clean and the bass strong. All these characters made
it very suitable for any place.
These cabinets is designed for professional stage performance . The special
handle shows unique Italy style. With the accurate crossover point made the
timbre very clean.
It adopt special horn in polypropylene reinforced. With wide directional angle
90°H ± 45°V ( 1kHz - 16kHz), and PS 2A LOW Output Power 150Watt Class
AB / HIGH Output Power 50Watt Class AB. All these characters made it very
suitable for any place. The main amplifier functions as following:
●One input volume control
●One set of Ø6.3 stereo MIC inlet
●One set of balanced outlet
●Clip indicators input signal level
●Overload ＆ overheat protection.
Technical Specification
PS2A
Active System Type Bi-Amp. With Analog Processor
Technical Specification
PS2 ( 2-way)
2.Specification
- 2 -
LOW Output Power LOW 150Watt RMS Bridge Class AB
HIGH Output Power High 50Watt RMS Class AB
(Max SPL at 1W,1m) 118dB SPL Calculated
Frequency Response 55HZ/20KHZ +/-10dB
Impedance Low-High) Low 8 Ohm-High 8 Ohm
Crossover Frequency Complex EQ Processor
Protection Low-High Limiter/Compressor plus PTC
LOW-Frequency High-Frequency 10"/266mm-1.5" Voice Coil 1" Compression Driver 1" Voice Coil
Horn Coverage H -V 90° H* 45° V
Input Sensitivity Line +4dB/1.23V
Impedance 30kOhms Balanced -15kOhms Unbalanced
Connectors Input with Jack / Link with XLR
Plastic Reinforced Calinet Trapezoidal & Monitor Shape
Hardware Suspension Seven Suspension Point
Amplifier Protections Soft Start- Short Circuit-DC voltage -Thermal Protection
External Control Volume-Clip-Ground Switch
Power Supply 230Volt/115Volt 50/60Hz
Dimensions (H*W*D) H:595 mm (23.4") W: 320mm (12.6") D: 334.5mm(13.2")
Net Weight (Lbs/Kg) 27.6 lbs /12.52 kg
Gross Weight (Lbs/Kg) 33.88 lbs /15.37 kg
ShippingVolume 3.36CFT
Passive System type 2-Way Vented box
Continuos Power Handling) 120Watt AES Standard
Peak Power Rating 240Watt Peak
SPL 1W,1m 96dB SPL
MAX SPL 1mt 117dB SPL Calculated
Frequency Response 60Hz ~ 20kHz ± 10dB
Impedance 8 Ohm Nominal
Crossover Frequency 2450Hz at 12dB/Oct
Low-Frequency 10" /266mm -1.5" Voice Coil
High-Frequency 1" Compression Driver 1" Voice Coil
Horn Coverage H -V 90°H ± 45°V ( 1kHz - 16kHz)
High Frequency Protection Electronic Dynamic Protection
Input Connectors Pin1+ ;Pin1Dimensions H: 395 mm (23.4") W: 320 mm (12.6") D: 334.5 mm(13.2")
Weight 21.38 lbs / 9.7 kg
Shipping Weight 27.67 lbs / 12.55 kg
Volume 3.36 CFT
CONTENT
1. Introduction.................................................................................................1
2. Specification...............................................................................................2
3. Block Diagram.............................................................................................3
4. Schematic Diagram....................................................................................5
5. PCB Layout...................................................................................................9
6. Exploded View & Mechanical Parts List............................................11
7. BOM..............................................................................................................15
D
3.Block Diagram
- 3 -
C
B
A
4321
HI SPEAKER
AMP
HI POWER
HPF
PS 2A BLOCK DIAGRAM
VOLUME
LOW SPEAKER+
BRIDGE OUT+
AMP
LOW POWER
LPF
LOW SPEAKER-
BRIDGE OUT-
PT-2A-E
V+
V-
D
MIX AMP
SIGNAL INPUT
C
POWER SWITCH
AC INPUT
B
1 2 3 4
A
D
PS 2A BLOCK DIAGRAM
- 4 -
654321
C
B
A
DRIVER SPEAKER
CROSSOVER CIRCUIT
B
SPK2
2-
1+
2+
1-
2-
B
2+
1-
WOOFER SPEAKER
SPK1
1+
D
INPUT
1 2 3 4 5 6
C
B
A
D
4.Schematic Diagram
PS2A
- 5 -
87654321
C
B
A
U3
+Vc
LM3886
C10
100u/50V
C17
C25
C4
100u/50V
0.1uC60.1u
V+
1
NC
2
OUT
3
V-
4
V+
5
NC
6
GND
7
MUTE
8
-VIN
9
+VIN
10
NC
11
R10
R15
820P
HI OUT+
-Vc
T3
0.01u
C21
R13
10E
DS1
LAMP 2.1A
R8
C18
10P
27K
R9
150E
0.1u
56P
C11
0E
R14
22K
33K
C23
220P
+Vc
C8
U1
LM3886
C24
100u/50V
C12
0.1uC50.1u
V+
NC
OUT
VV+
NC
GND
MUTE
-VIN
+VIN
NC
C1
1
2
3
4
5
6
7
8
9
10
11
-Vc
100u/50V
100u/50V
C15
0.1uC20.1u
V+
NC
OUT
VV+
NC
GND
MUTE
-VIN
+VIN
NC
-Vc
C3
1
2
3
4
5
6
7
8
9
10
11
R7
Z1
-Vc
100u/50V
10K
8V2
Q1
C7
BC327
10K
220u/16V
LOW BRIDGE-
T1
R4
C16
10P
R5
560E
C20
10u/50V
R18
470K
R17
1K
+Vc
C27
T6
VacT8GNDT7Vac
6800u/50V
BU10-04
C28
0.1u/275V
-Vc
C26
6800u/50V
BR1
+Vc
C9
LOW BRIDGE+
T2
R1
10K
C13
10P
U2
R2
560E
C19
10u/50V
C14
560P
R3
1k
R12
220K
R11
10K
LM3886
R6
10K
D1
VTL5C4
R16
10K
D
C22
0.1u
C
CN1
123456789
CN-5PX2-F
10
-Vc
+Vc
1 2 3 4 5 6 7 8
B
A
A
PS2A
- 6 -
D1
123456789
J4
B
10
CN-5PX2-F
3
C14
VR1
C
R12
10K
2
B50K
1
CLIP LED (RED)
D
4321
10u/63V
33P
3K9
R4
C11
1K
680E
10K
J2
R5
_
U1B
R8
C13
22nF
C4
C2
R6
U1A
48
_
-15V
2
10K
R2
C8
22u/25V
213
4
CN-BAL-MALE
LINK
NJM2068LD
+
0.15u
0.22u
1
NJM2068LD
+
3
R1
C1
22u/25V
10P
10K
3c5e1a4d2b
J1
+15V
C12
10K
15V1W
15V1W
R3
56K
R7
Z3
Z4
INPUT
15V1W
15V1W
Z1
15V 1W
C6
0.1u
TO PL
5
2
820E 1W
C9
220u/25V
15K 0.5W
R13
-15V
GND
6
P
3
R11
SW PS-22E85L
SW PS-22E85L
1 2 3 4
R12
820E 1W
Z2
15V 1W
C10
220u/25V
C7
0.1u
1
2
CN1
+15V
Z6
4
Z5
R10
C15
10E
SW1B
1
SW1A
0.01uF/400V
D
C
B
A
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