A 4115 15W Stereo Amplifier
®
www.altronics.com.au
Proudly Assembled in Australia
OPERATING INSTRUCTIONS
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia.
Phone: 1300 780 999 Fax: 1300 790 999
Internet: www.altronics.com.au
REDBACK A 4115 15W Stereo Amplifier
Page 2
L
Aux Input
R
Mic Input
1
3
2
12V DC
IN
DC
Fuse
(M205 5A)
Made in Australia by
Altronic Distributors Pty Ltd
240V AC (2A M205 Fuse)
+ -
+ -
+ -
SPKR
LEFT
SPKR
RIGHT
Fig. 1: Rear panel layout.
Fig. 2: Front panel layout.
On
Power
Mic
Input
MIC
6
8
2
0
10
4
BASS
6
8
2
-
+
4
TREBLE
BALANCE
Music
Input
AUX
6
8
2
0
10
4
6
8
2
-
+
4
6
8
2
-
+
4
2 3 4 5 6 7 8 9
4
5 6 7 8 9
1 6.35mm Mic Input
2 3.5mm Input
3 Microphone Level
4 Auxiliary Level
5 Bass
6 Treble
7 Balance
8 Power LED
9 Power Switch
1 Snap in AC Fuse
2 IEC Mains Socket
3 DC Fuse
4 12V DC Input +/-
5 Right Speaker +/-
6 Left Speaker +/-
7 Headphone Output (3.5mm)
8 Auxiliary Input (RCA)
9 Microphone Input (XLR)
Legend
Legend
OVERVIEW
The Redback A 4115 stereo amplifier is super compact
and ideally suited to smaller PA system installations.
Designed around the National TDA1519 IC it offers
virtual "destruction proof" operation even under sever
misuse such as over voltage, over temperature, over load
and short circuit speaker line conditions. The amplifier is
extremely stable even when microphone and speaker
cables are run together over long distance. The unit will
automatically shut down when overloaded and will
restore to normal operation when the fault condition is
removed.
The A 4115 can be used as a stand alone/ bench mount
amplifier or can be rack mounted when used in
conjunction with optional hardware. The amplifier can
be operated from either 12-14V DC or 240V AC . This
versatility makes it ideal for mobile applications such as
tour buses, boats etc.
FEATURES
• 15W RMS Output
• 1 balanced XLR and unbalanced jack mic input
• 1 Music input (3.5mm)
• 1 Auxiliary input
• 4-16Ω output
• 240VAC / 12-14VDC operation
• Headphone Socket
TROUBLE SHOOTING
NO POWER
(Power LED light does not illuminate) Check mains fuse. Only
replace with M205, 240V AC 2A rated fuse.
DISTORTED OUTPUT
Check that the speaker type is correct for the output that you
are using. Check for any short circuits on the speaker line.
VERY LOW OUTPUT
Make sure that the input is the correct level (check for shorted
connectors). Check for any short circuits on the speaker line.
CONTINUALLY BLOWS FUSES
Make sure that the speaker line is not shorted. Check also
speaker types, ratings and if on correct output.
AMPLIFIER KEEPS ON CUTTING IN & OUT
Check speaker types, ratings and for any short circuits on the
speaker line.
3
1 2
1
REDBACK A 4115 15W Stereo Amplifier
Page 3
Power Output: ............15 watts RMS @ 13.8V into 4Ω
Distortion:..................................................< 3% @ 1kHz
SIGNAL TO NOISE RATIO
Typically 75dB below rated output.
FREQUENCY RESPONSE
Mic input: .......................................50Hz - 10kHz, -3dB
Aux input:.......................................60Hz - 15kHz, -3dB
INPUT SENSITIVITY
Mic 1: .....................................................1.5mV balanced
1.5mV unbalanced
Music Input: ................................................................1V
Aux Input: ....................................................................1V
OUTPUT CONNECTORS
Speakers:...............................................Screw terminals
Output impedance: ..................................................4-16
Headphones:.............................................3.5mm socket
INPUT CONNECTORS
Mic 1: ...............................................3 pin XLR balanced
or 6.35mm jack unbalanced
Aux input:..............RCA stereo socket, bridged mono
Music input: .............................................3.5mm socket
12V DC power:.....................................Screw terminals
240V AC power:..........................IEC power connector
CONTROLS
Mic Volume, Aux Volume, Bass, Treble, Balance,
ON/OFF switch.
Indicators: ..............................................................Power
MISC.
Power supply: ...............................240V AC or 12V DC
Protection:........................2A AC fuse and 5A DC fuse
4 x 1A internal speaker protection fuses
Weight:...................................................................≈2.5kg
Dimensions:.........................≈270W x 160D x 44H mm
Colour:......................................................................Black
*Specifications subject to change without notice
SPECIFICATIONS
CD Player
+
12V Battery
Speakers
Microphone
Note: Microphone XLR input at rear is
balanced. A 6.35mm unbalanced jack on
the front panel can also be used at the same
time, however this will result in mixed audio
from both inputs.
L
Aux Input
R
Mic Input
1
3
2
12V DC
IN
DC
Fuse
(M205 5A)
Made in Australia by
Altronic Distributors Pty Ltd
240V AC (2A M205 Fuse)
+ -
+ -
+ -
SPKR
LEFT
SPKR
RIGHT
Internal fuses:
Four internal fuses are provided for speaker protection. In the event of a
short circuit these fuses may require replacing before correct operation
may resume. Always replace with 1 Amp M205 type fuse.
REDBACK A 4115 15W Stereo Amplifier
Page 4
F1
4A
C55
470n
C7
470n
R20
10
R26
10
R25
10
R13
10
R36
4K7
+12
C19
100n
C15
3300/25V
C16
3300/25V
1
2
P3
12V DC IN
B1
C23
100
R37
4k7
6VDC
R7 680
R8 680
R11
10k
R21
10k
NINV
1
AGND
2
R/R
3
OUT1
4
GND
5
OUT2
6
VCC
7
M/S S
8
INV
9
U2
TDA1519C
C17
220nf
+12
C30
100
+12
1
2
P5
24V AC IN
1
2
P4
SPEAKER OUT 4-16OHM
R10
220R
C21
1000
VCC
C1
1n
C2
1n
ZD1
6v8
LED1
POW ER
C18
100n
D1
6A DIODE
1A
F2
1A
F3
R46
6K8
R3
6K8
VCC
R9
680R
1
1
2
2
3
3
J1
PHANTOM POW ER
O
FF
O
N
JUMPER
S2
PHONEJACK2
R56
220R 1W
1
2
3
P1
AXRFEM
L
R
E
S1
RCASTEREO
R6
220R
R5
220R
R38
4K7
15V
ZD2
R14
100K
C25
22UF 25V
C54
470n
C6
470n
R19
10
R17
10
R16
10
R27
10
NINV
1
AGND
2
R/R
3
OUT1
4
GND
5
OUT2
6
VCC
7
M/S S
8
INV
9
U1
TDA1519C
+12
C49
100
+12
1
2
P4
SPEAKER OUT 4-16OHM
1A
F2
1A
F3
P6
PHONEJACK STEREO SW
R55
220R 1W
C53
220nf
R15
100K
C51
22UF 25V
C72
470n
C65
10
C67
220n
C64
220n
C70
220n
C62
220n
R53
47k
R52
47k
VR3
100k LIN
VR1
100k LIN
C69
10
C60
10
C57
47
C71
10n
C68
390n
C59
10n
C61
390n
BAL
9
BY 1
5
CB1
6
LC
7
OPT1
8
TREB
4
1
CT2
18
ZV
17
BY 2
16
CB2
15
BASS
14
OPT2
13
VC
12
VCC
11
GND
10
CT1
3
I1
2
I2
19
GND
20
U7
LM1036
C58
470n
R51
10K
R50
10K
VCC
C66
1UF
C63
1UF
R49
10R
BA SS TREBLE
R1
10K
R2
10K
C50
47/35V
C73
47/35V
R48
47k
VR2
100k LIN
R90 47k
VR5
100k LIN
AUX. Volume
R79
10K
R80
10K
R82
100K
R81
100K
J?
3.5M M JACK STEREO
(FRONT PA NEL)
C22
100uf
C4
10UF BP
C3
10UF BP
2
3
1
8
4
U4A
LM833
R12 10K
R13
10k
C27 100PF
VCC
C8
10
6VDC
R102 10K
R32
10k
C76 100PF
C12
10
6VDC
C56
470n
C39
10
C41
220n
C38
220n
C44
220n
C36
220n
R45
47k
R39
47k
C42
10
C34
10
C31
47
C45
10n
C42
390n
C33
10n
C35
390n
BAL
9
BY 1
5
CB1
6
LC
7
OPT1
8
TREB
4
1
CT2
18
ZV
17
BY 2
16
CB2
15
BASS
14
OPT2
13
VC
12
VCC
11
GND
10
CT1
3
I1
2
I2
19
GND
20
U6
LM1036
C32
470n
R43
10K
R42
10K
VCC
C40
1UF
C37
1UF
R41
10R
R40
47k
R90
47k
R78
100R
RG1
1
-IN
2
+IN
3
V-
4
GND
5
OUT
6
V+
7
RG2
8
U3
SSM 2017
R18
56R
VCC
C74
0.1
C19
220pF
R30
10K
R29
10K
6VDC
2
3
1
84
U5A
LM833
R22 10K
R54
10k
C5 100PF
VCC
C80
10
6VDC
R23 10K
R24
10k
C77 100PF
C79
10
6VDC
BA LA NCE
C26
1UF BP
C11
1UF BP
C98
1UF BP
C10
1UF BP
C24
100NF
C78
CAP
C88
CAP
6
5
7
U4B
LM833
6
5
7
U5B
LM833
VR5
100k Lin
GND
MIC VOLUME
R44
220R
R47
220R
R51
220R
R101
10K
R100
10K
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