Audiosystem US Series User manual

trouble shooting
-4-
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 - remote cable professional connected?
- fuses inserted and alright?
- ground connection professional connected?
- analyze voltage on the amplifier.
- +12V / +24 V powercable professional connected?
- cinch cable or high level input alrigth and professional connected
- head unit alright?
- loudspeaker 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)?
PROTECTION LED
WHILE AMPLIFIER IS
SOUNDLESS
ILLUMINATES GREEN
ILLUMINATES RED
PROTECTION LED
POWERED UP
WHEN AMPLIFIER IS
ERROR IN AMPLIFIER FUSE
Make sure when changing fuses to use the same value.
- loudspeaker impedance alright?
- ground professional connected?
! CAUTION !
SOUND TOO LOW OR
LOW-DISTORTED SOUND
(Check head unit, amplilfier, DSP, soundprozessor, equalizer,
- loudspeaker cable checked?
frequency bandpassfilter...)
- crossover frequencies has been properly set?
- output level control of the head unit alright?
- loudspeaker error?
- input level control “GAIN” is set to match the head unit?
- 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
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!
Please contact your specialized dealer if the amplifier is still not working after it has been
checked with the error list!
ATTENTION
ILLUMINATES RED WHEN
AMPLIFIER IS POWERED UP)
OVERHEATING
(PROTECTION LED
- impedance alright?
- loudspeaker error?
- adequate airflow of the amplifier?
! CAUTION !
After cooling down, the amplifier turns on automatically.

- Extremely wide input sensitivity from 0,1 to 10 V
- 2x Precision Passive Membranes (PPM)
- 20cm Active-Underseat-Alu-Woofer with extremely heavy aluminum housing
- Multi-Way Protection Circuitry: overheating, overcurrent, short circuitry & DC protection
- High-Power-Input (normally originial radio) with automatically „Turn-On“
- Cable-Set and RTC included
- Cable-High-Level-Input or Cinch-Input
Power Supply Voltage
RMS Power @ 2 Ohm Mono
Signal to Noise Ratio
Low Pass Crossover (LPF)
Subsonic Filter
Phase Shift
Frequency Response
THD@RMS Watts
Bass-Boost
Fuse Rating
Input Sensitivity
Dimensions
Power Watt RMS
Frequency Response
Impedance
Dimensions
10 - 16 V / 22 - 28 V
200 W
> 92 dB
50 - 150 Hz
20 Hz
0° / 180°
20 Hz ~ 150 Hz (+/-1 dB)
< 0,3%
0 bis +18 dB
25A
0,1 V ~ 10 V (+/- 5%)
345(L) x 245(B) x 70(H) mm
350 W
20 Hz ~ 150 Hz (+/-1 dB)
2 Ohm
345(L) x 245(B) x 70(H) mm
Equipment active + 24 V
Technical data active + 24 V
Technical data active + 24 V
manual
-1-
IMPORTANT: Your proof of purchase is evidence of warranty claim for repair or replacement. Keep your proof of
purchase, manual and original packaging.
ATTENTION: Use of sound components can impair your ability to hear necessary traffic sounds and may
constitute a hazard while driving your automobile.
Audio System Germany 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.
Congratulation on your purchase of your new us-Series Active Subwoofer.
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.
PRICE/QUALITY: EXCELLENT
COMPACT CLASS
1,2 TIP
POWER
US 08 ACTIVE + 24v + US 08 passive

power connections
-2-
GROUND Remote Connection
(optional)
FUSE
Max.30 cm
3. +12 V / 24 V Power connection:
Connect the +12 V / +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 6 - 10). This fuse protects the amplifier and the vehicle against the
possibility of a short circuit in the power cable.
You can optional connect the REM-terminal of the amplifier to the remote-output (automatic 12 V / 24 V
antenna-output) of the head unit. Therefore use a 0,5 - 1,5 mm power cable.
4. Remote connection (optional):
First disconnect the power supply of the
vehicle. This works out the best by
removing the ground cable of the battery.
Make sure, that the connection with the
vehicle chassis is free of paint, dirt and
dust.
2. Ground connection
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 6 - 10).
BATTERY HEAD UNIT
black
orange
yellow
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 / 24 V DC 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

-3-
RCA/speaker connection
Der US 08 active + US 08 activ 24v have RCA inputs, which are connected by RCA
cable with the preamp outputs of the control unit (Headunit, MP3 player, iPhone, iPad). If this is not possible
(usually with an original radio, OEM), the loudspeaker outputs of the Headunit can be connected directly to the
HIGH-LEVEL inputs and the switch can be set to "Auto Power". The amplifier turns on automatically when a
signal is present.
With the help of the INPUT GAIN controller, PHASE
SHIFT, BASS BOOST and the variable frequency
crossover (LOW PASS filter) you can adjust the
power amplifier to the radio, to the conditions in the
In this regard, AUDIO SYSTEM Germany recommends to adjust your amplifier through a
specialized service center, dealer or a specialist.
Headunit
Headunit
white L+ white/black L-
gray/black R-grey R+
With the connected RTC (cable remote
control), the subwoofer can be controlled by
the driver's area.
Remote Control
RTC (optional)
ATTENTION: Plug in the white Molex connector for single operation and connect both ASIA connectors.
To connect the US 08 Passive to the ACTIVE, connect the 2 Asia plug connections with one
another (see figure). You can also operate the US 08 Passive on another power amplifier by using
the SUB inputs.
US 08 active +24v
(normal) US 08 active + 24v
NORMAL VERBUNDEN
SUB-OUTPUT RED
ASIA FEMALE
SUB-OUTPUT RED
ASIA FEMALE
SUB-OUTPUT BLACK
ASIA MALE
SUB-OUTPUT BLACK
ASIA MALE
SUB-INPUT RED
ASIA MALE
MIT DEM
VERSTÄRKER
VERBINDEN
(ACHTUNG: 2 OHM)
SUB-INPUT RED
ASIA MALE
SUB-INPUT BLACK
ASIA FEMALE
SUB-INPUT BLACK
ASIA FEMALE
US 08
passive US 08 passive