Audiosystem C0-70.4 User manual

designed and engineered by audio system Germany
C0- 70. 4
C0- 75. 4 24 v
C0-100.2
High-Performance
Car- amplifier
owner‘s manual
R
since 1988
german sound

CO-100.2
CO-70.4 / CO- 75.4 24 v.. .
- 4-Channel High Power Class-AB amplifier with SMD technology
- MOS-FET PWM Power Supply
- Stable into 2 ohm stereo per channel and 4 ohm bridged mode
- Variable switchable Low Pass Filter from 30 to 300 Hz
- Variable switchable High Pass Filter from 30 to 300 Hz
- Input Sensitivity: variable 200 mV maximum to 8 v minimum
- Multi-Way Protection Circuitry: overheating, overcurrent, short circuitry and speaker
DC protection
- Operating Voltage: DC 10 ~ 16 V / DC 20 ~ 32 V in CO-75.4 24 V power input..
- Wired Remote Control RTC (optional)
- High-Power-Input (normally originial radio) with automatically „Turn-On“
- Adaptercable HLAC and rca hi (optional)
features
- Stable into 2 ohm stereo per channel and 4 ohm bridged mode
- Variable switchable Low Pass Filter from 30 to 300 Hz
- Variable switchable High Pass Filter from 30 to 300 Hz
- Input Sensitivity: variable 200 mV maximum to 8 V minimum
- Multi-Way Protection Circuitry: overheating, overcurrent, short circuitry and speaker
DC protection
- Operating Voltage : DC 10 ~ 16 V power input
- Wired Remote Control RTC (optional)
- High-Power-Input (normally originial radio) with automatically „Turn-On“
- Adaptercable HLAC and rca hi (optional)
- MOS-FET PWM Power Supply
- 2-Channel High Power Class-AB amplifier with SMD technology
2
Congratulation on your purchase of your new c-Series amplifier.
IMPORTANT: Your proof of purchase is evidence of warranty claim for repair or replacement. Keep your proof of
purchase, manual and original packaging.
IMPORTANT: Before installation your power amplifier, we recommend to read the owner´s manual carefully and
to follow the instructions regarding connection and fitting exactly.
ATTENTION: Pay attention to advices and instructions of the car manufacturer.
Audio SystemGermany accepts no liability for hearing loss, bodily injury or property damage
as a result of use or misuse of our products. We recommend installing the equipment by an authorized service
center or dealer. A professional fitting and connection is the requirement for further warranty and perfect sound.
ATTENTION: Use of sound components can impair your ability to hear necessary traffic sounds and may
constitute a hazard while driving your automobile.
PRICE/QUALITY: EXCELLENT
UPPER CLASS
1,4
PRICE/QUALITY: EXCELLENT
UPPER CLASS
1,5

CO-70.4 / CO- 75.4 24 v.. .
power connection
BATTERY
GROUND
3. +12 V Power connection (+24 V in co- 75. 4 24 V):
Connect the +12 V (+24 V in co- 75. 4 24 V)contact of the amplifier with the supply cable via a fuse directly
to the vehicle battery. Keep in mind, that the length of the cable from fuseholder to vehicle battery has to be a
maximum of 30 cm. Requirement for a perfect function of the amplifier is a qualitative high end fuse holder as well
as a suitable cable cross section (AWG sice 8 - 6). This fuse protects the amplifier and the vehicle against the
possibility of a short circuit in the power cable.
4. Remote connection
Connect the REM-terminal of the amplifier to the remote-output (automatic 12 V (+24 V bei co- 75. 4 24 V)
antenna-output) of the head unit. Therefore use a 0,5 - 1,5 mm power cable.
FUSE
GND REM +12V
to REMOTE Turn-on
from HEAD UNIT
HEAD UNIT
First disconnect the power supply of the vehicle.
This works out the best by removing the ground
cable of the battery.
1. Battery disconnection
Connect the GND (ground) connection of the
amplifier with the car chassis. Keep this cable
as short as possible (not longer than 50 cm) and
use a suitable cross section (AWG sice 8 - 6).
2. Ground connection
Make sure, that the connection with the vehicle
chassis is free of paint, dirt and dust.
Fuse
Max.30 cm
3
a) Take care of a professional attachement. Pay attention, that no electrical cable, gas tank, hydraulic
breakes or other components get damaged.
b) There has to be enough cooling and air circulation. Avoid the installation in small closed boxes or close
to heatening parts.
c) Protect the amplifier from fluids, wetness, heat and foreign material as well as from other influences.
d) The amplifier is only to be built into vehicles with a 12 V DC (+24 V in co- 75. 4 24 V)
power supply.
e) Never install the power supply cable with other original wires of the vehicle (gas cables), fan motors,
brand control moduls etc.
f) Install the signal cable (cinch cable) as well as the speaker cable far away of the power cables to avoid
troubles with the music signal.
g) The cables of your amplifier have to be installed, so that there is no danger of binding, squeezing or
breaking.
Please follow the instructions during the installation of your amplifier:
ATTENTION

IN PUT MO D E
LI N E I N CH 1/ 2
LE V E L X- O VE R
LI N E I N
HI
CH 2 CH 4
CH 1 CH 3
LO W
RE M OT E
MI N MA X 30 Hz
30 Hz
300 H z
300 H z
MI N MA X
HP F
HP F
LP F
LP F
FU LL
FU LL
RCA connection
co-100.2
CO-70.4 / CO- 75.4 24 v.. .
HE AD U NI T
HE AD U NI T
to INP UT of
additional
AM PLI FIERS
4
Wired Remote Control
RTC (optional)
Wired Remote Control
RTC (optional)
for channel 3 + 4
LI NE O UT L IN E IN RE MOT E
R R
L L
IN PUT MO D E
HI L OW 3 0 Hz 300 H z
MI N MA X
LE V EL X -O V ER
LP F
FU LL
HP F
C0-100.2
The Input Mode has to be switched on “HI“. Important: the Gain-Controller has to be adjusted to minimum,
then carfully turn up the volume. If signal is presented, the amplifier automatically turns on. Adaptercable HLAC
and RCA HI can be purchased at your specialized dealer.
With the aid of the variable high- and lowpassfilter, phase shift-controller, the gain-controller and subsonicfilter you
are able to adjust the amplifier on to your prefered taste of hearing, the circumstances of the vehicle and to the
speakers.
Optional a wire remote controller RTC can be installed to adjust the output level.
In this regard, AUDIO SYSTEM germany recommends to adjust your amplifier through a
specialized service center, dealer or a specialist.
The c Series amplifier offers RCA-Inputs, which are connected through cinch cables with the preamplifier-
outputs of the head unit. If the head unit (OEM-RADIO) has no RCA-Output, than it is possible to connect the speaker
output direct to RCA/Cinch-Input of the amplifier.
R
since 1988
german sound
R
since 1988
german sound

co-100.2
1-Channel Bridged
Tri-Mode
2-Channel Stereo
speaker
impedance
4 ~ 8 Ohm
speaker
impedance
2 ~ 8 Ohm
speaker
impedance
4 ~ 8 Ohm
speaker connection
5

CO-70.4 / CO- 75.4 24 v.. .
speaker connection
2-Channel Mono
2-Channel Stereo + 1-Channel Mono Bridged
4-Channel Stereo
speaker
impedance
4 ~ 8 Ohm
speaker
impedance
2 ~ 8 Ohm
speaker
impedance
4 ~ 8 Ohm
6

Trouble Shooting
7
This power amplifier is featured with an efficient protection system to prevent any damages like over-heating,
overvoltage, short-circuit and DC at the loudspeaker output.
Occuring an error the protection-LED will light in red. In order to check the problem, first turn down all levels of
the head unit, afterwards turn it off.
AMPLIFIER IS NOT
POWERED UP, NO LED IS
LIGHTENING
- ground connection professional connected?
- remote cable professional connected?
- +12V powercable professional connected?
- fuses inserted and alright?
- analyze voltage on the amplifier.
- loudspeaker professional connected?
- head unit alright?
- cinch cable alrith and professional connected
- amplifier too hot?
- short-circuit at the loudspeaker output?
- short-circuit caused by loudspeaker cable with vehicle chassi (ground)?
- input voltage too high (e.g.faulty generator)?
ILLUMINATES GREEN
WHILE AMPLIFIER IS
SOUNDLESS
PROTECTION LED
ILLUMINATES RED
WHEN AMPLIFIER IS
POWERED UP
PROTECTION LED
ERROR IN AMPLIFIER FUSE - ground professional connected?
- loudspeaker impedance alright?
Make sure when changing fuses to use the same value.
! CAUTION !
LOW-DISTORTED SOUND
SOUND TOO LOW OR
- output level control of the head unit alright?
- loudspeaker error?
- loudspeaker cable checked?
(Check head unit, amplilfier, DSP, soundprozessor, equalizer,
frequency bandpassfilter...)
- input level control “GAIN” is set to match the head unit?
- crossover frequencies has been properly set?
- ground connection professional connected?
- short-circuit caused by loudspeaker cable with vehicle chassi (ground)?
- cinchcable (RCA) and/or loudspeaker cabel installed too
close to the power connection cable?
- cinch ground (RCA) of the head unit alright?
HIGH HISS-ENGINE NOISE
IN SPEAKERS
Please contact your specialized dealer if the amplifier is still not working after it has been
checked with the error list!
For warranty adjustement / repairs the original invoice has to be attached!
Opening the power amplifier is leading to a lost of warranty in either case!
AT TEN T ION
(PROTECTION LED
ILLUMINATES RED WHEN
AMPLIFIER IS POWERED UP)
OVERHEATING
! CAUTION !
- impedance alright?
- loudspeaker error?
After cooling down, the amplifier turns on automatically.
- adequate airflow of the amplifier?

co-100.2
Power Supply Voltage
Rated Power Output at 14,4 V
-RMS power @ 4 ohm stereo
-RMS power @ 2 ohm stereo
-RMS power @ 4 ohm bridged
Signal to Noise Ratio
Low Pass Crossover
High Pass Crossover / Subsonic filter
Frequency Response
THD@RMS Watts
Channel Separation
Fuse Rating
Input Sensitivity
Dimensions
CO-70.4 / CO- 75.4 24 v.. .
Power Supply Voltage
Rated Power Output at 14,4 V / 28,8 V
-RMS power @ 4 ohm stereo
-RMS power @ 2 ohm stereo
-RMS power @ 4 ohm bridged
Signal to Noise Ratio
Low Pass Crossover
High Pass Crossover
Frequency Response
THD@RMS Watts
Channel Separation
Fuse Rating
Input Sensitivity
Dimensions
specifications
8
designed and engineered by audio system Germany
PRICE/QUALITY: EXCELLENT
UPPER CLASS
1,4
PRICE/QUALITY: EXCELLENT
UPPER CLASS
1,5
10 - 16 V / 20 - 32 V
4x 70 W / 4x 75 W
4x 110 W / 4x 120 W
2x 220 W / 2x 240 W
>97 dB
30 ~ 300 Hz
30 ~ 300 Hz
10 Hz ~ 45 KHz (+/-1 dB)
< 0,049%
75 dB
25 A x 2 / 15 A x 2
200 mV ~ 8 V (+/- 5%)
280(W) x 47(H) x 171(L) mm
10 - 16 V
2x 100 W
2x 160 W
1x 320 W
>96 dB
30 ~ 300 Hz
30 ~ 300 Hz
10 Hz ~ 45 KHz (+/-1 dB)
< 0,048%
75 dB
35 A x 1
200 mV ~ 8 V (+/- 5%)
240(W) x 47(H) x 171(L) mm