MB QUART QB201A Active Subwoofer System User Manual
- June 9, 2024
- MB QUART
Table of Contents
QB201A Active Subwoofer System
User Manual
IMPORTANT INFORMATIONS
QB201A
Subwoofer …………………………………………………..20 cm (8”)
Output Power RMS ……………………………………………125 Watts
Output Power Max. ……………………………..250 Watts
Lowpass Filter ……………………………………………50 – 150 Hz
Phase Shift ………………………………………..0°/180°
Bass Boost …………………………………………..0 – 12 dB
Input Sensitivity ……………………………………….. 10 V – 0,2 V
Operating Voltage ……………………………….+12 V (9 – 15 V), negative ground
Fuse Rating ……………………………………………………. 25 A
Dimensions (W x H x L) …………………………………….240 x 73 x 325 mm
QB251A
Subwoofer …………………………………………………25 cm (10”)
Output Power RMS ……………………………………………..150 Watts
Output Power Max. ………………………………………………..300 Watts
Lowpass Filter ………………………………………………50 – 150 Hz
Phase Shift ……………………………………………………….0°/180°
Bass Boost ……………………………………………………0 – 12 dB
Input Sensitivity …………………………………………. 10 V – 0,2 V
Operating Voltage ……………………………………………+12 V (9 – 15 V), negative ground
Fuse Rating ……………………………………………………….. 25 A
Dimensions (W x H x L) …………………………….270 x 78 x 355 mm
All Specifications are subject to change.
DISPOSAL
If you need to dispose the device and its components, please note that no electronic devices may be disposed with the household waste. Dispose the device and its components at an appropriate recycling facility in accordance with local waste regulations. If necessary, consult your local authority or dealer.
IMPORTANT NOTES PRIOR TO INSTALLATION
ATTENTION: Before you start with the installation, disconnect the ground connection from the vehicle’s battery in order to prevent short circuits. This guide is an installation aid for a proper installation of the sound system. Please read the following instructions:
- This device is only suited for a 12 volt system in a vehicle with negative ground.
- The radiated heat while operation requires sufficient air circulation at the place of installation.
- Ensure the accessibility of the fuse and the operating elements after installation.
- The reliability and performance of the device depends on the quality of installation.
- Please treat all parts of the sound system and the components of your vehicle with caution.
- Follow under all circumstance the regulations of the vehicle manufacturer and do not make any modifications on the vehicle, which could interfere the driving safety.
INSTALLATION
Choose a suitable location for your device. The permanent temperature of the
location should not be lower than 5°C and not higher than 50°C. Protect the
device from moisture and humidity. Ensure that your device will not get loose
during the drive and hurt someone in the passenger cabin. Use therefor the
included mounting brackets (4 x) and screws (8 x). Then use self-tapping
screws (not included) from the specialist trade, to fix the device in your
vehicle.
Please observe not to damage any serial components of your vehicle (air bags,
wires, gas tank etc.) during the installation of your device by drilling or
any other operations.
INTERCONNECTION
POWER SUPPLY AND TURN-ON-CONNECTION
First connect the GND terminal ( 3 ) of the device to an appropriate ground
connection at the chassis. To ensure a good connection, remove dirt and dust
from the connection point. A loose connection may cause malfunctions or
interferences noise and distortion.
Use at least a 10 mm2 cross-section for the power and ground connection cable.
Suitable cable sets are available at the specialist shop.
Then connect the +12 V terminal ( 2 ) of the device with the battery by using
an appropriate cable including an in-line fuse. This fuse should be located
very close to the battery; for safety reasons not more than 30 cm away. Only
insert the fuse when the installation has been accomplished.
Then connect the remote turn-on-wire from the head unit with the device‘s REM
terminal ( 1 ). A cable with a cross-section of 0.5 mm 2 is adequate.
AUTO-TURN-ON FUNCTION
The amplifier detects a voltage rise (6 Volts) with a so called ”DC Offset”
over the connected input signal on the HIGH LEVEL input ( 5 ) when the head
unit will be switched on. Hence, the amplifier will also be turned on. As soon
as the head unit will be turned off, the amplifier turns also automatically
off. In this case the turn-on connection at REM ( 1 ) is not needed, if the
switch ( 5 ) is in position ON.
Note: The Auto Turn On-function usually works with 90% of all head units,
because they are equipped with ”High Power”-outputs. Only with a few older and
still existing head units the Auto Turn On-function is not working.
FUSE
Fuse with a rating of 25 A ( 4 ). If the fuse is defective, please replace
with an equivalent fuse.
PROTECTION CIRCUIT
If the POWER LED ( 4 ) lits up, the device is in normal operation. If the
PROTECT LED ( 3 ) lits up, the device is overheated. If this occurs, the
internal built-in protection circuit shuts down the device automatically. The
device should work again properly after cooling down.
AUDIO SIGNAL CABLES
Connect the audio signal cables from the RCA outputs of the head unit to the
RCA inputs on the device ( 1 ).
HIGH LEVEL INPUT
The HIGH LEVEL input ( 2 ) is suitable to connect the device input with
speaker wires, if your head unit is not equipped with pre-amplifier RCA
outputs. Extend therefor every regarding speaker cable from your head unit
with appropriate speaker cables from your car audio retailer to the mounting
location of the amplifier. Then connect the each matching loudspeaker cable
with the cables of the included HIGH LEVEL input jack.
NOTE: Never use the HIGH LEVEL input ( 2 ) and the RCA inputs ( 1 ) at
the same time. This may damage the device seriously.
OPERATING ELEMENTS
INPUT SENSITIVITY
Turn the volume controller of your head unit to the center medium position and
then turn up the INPUT LEVEL controller ( 2 ) until you have an average medium
level without distortion. This setting usually provides sufficient power
reserves at optimum weighted signal-to-noise ratio.
LOWPASS FILTER
Set the desired crossover frequency of the low pass filter by using the LOW
PASS controller ( 4 ). Hence, only the frequencies below the chosen crossover
frequency will be amplified and the subwoofer plays more precisely and
efficient.
BASS BOOST
By using the BASS BOOST controller ( 3 ) you are able to increase the bass
boost level from 0 dB to 12 dB.
Caution: Please use the bass boost with care.
BASS LEVEL REMOTE CONTROLLER
Connect the included Bass Level Remote Controller at the REMOTE CONTROL input
( 1 ). This allows you to control the bass level f.e. out of the driver’s
seat.
PHASE
The PHASE switch ( 5 ) allows you to set the phase between 0° or 180° to match
the output signal with the vehicle’s interior acoustic and the loudspeakers of
the sound system.
TROUBLE SHOOTING
If you are having problems after installation follow the trouble shooting
procedures below.
Procedure 1:
Check the device for proper connections.
Verify that POWER LED is on. If POWER LED is on skip to Step 3, if not
continue.
- Check the fuse of the device or the external fuse on battery positive cable. Replace if necessary.
- Verify that Ground connection is connected to clean metal on the vehicle’s chassis. Repair/replace if necessary. Please ensure that you have reconnected the GND connection at the battery after the installation.
- Verify that there are 9 to 16 Volts present at the positive battery and remote turn-on cable. Verify quality connections for both cables at device, head unit and battery/fuse holder. Repair/replace if necessary. Check that the vehicle charging system is maintaining proper voltage.
Procedure 2:
PROTECTION LED is on.
- If the PROTECTION LED is on, this is a sign of driving the device at very high power levels without adequate airflow around the device.
Shut off the system and allow device to cool down. If the previous items do not solve the problem, a fault may be in the device.
Check that the vehicle charging system is maintaining proper voltage.
Procedure 3:
Check the device for a proper audio signal.
- Verify good RCA input connections at head unit and device. Check entire length of cables for kinks, splices, etc. Test RCA inputs for AC volts with stereo on. Repair/replace if necessary.
- Use another audio source for testing to provide an audio signal to the Line Input.
Procedure 4:
Check the device for a popping noise while turning on.
- Disconnect input signal to device and turn device on and off.
- If the noise is eliminated, connect the REMOTE lead of device to source unit with a delay turn-on module.
OR
- Use a different 12 Volt source for REMOTE lead of the device (e.g. battery direct just for testing).
- If the noise is eliminated, use a relay to isolate the device from noisy turn-on output.
- Don‘t connect REMOTE directly to the battery after testing to avoid a discharge of the battery.
Procedure 5:
Check the device if you experience excess Engine Noise.
-
Route all signal carrying wires (RCA, Speaker cables) away from power and ground wires. OR
-
Bypass any and all electrical components between the head unit and the device. Connect the head unit directly to input of the device. If noise goes away the unit being bypassed is the cause of the noise. OR
-
Use another audio source for testing to provide an audio signal to the Line Input. OR
-
Remove existing ground wires for all electrical components. Reground wires to different locations. Verify that grounding location is clean, shiny metal free of paint, rust etc. OR
-
Add secondary ground cable from negative battery terminal to the chassis metal or engine block of vehicle. OR
-
Have alternator and battery load tested by your mechanic. Verify good working order of vehicle electrical system including distributor, spark plugs, spark plug wires, voltage regulator etc.
Audio Design GmbH
Am Breilingsweg 3 · D-76709 Kronau/Germany
Tel. +49 7253 – 9465-0 · Fax +49 7253 – 946510
www.audiodesign.de
©2018 Audio Design GmbH, All Rights Reserved
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QUART QB201A Active Subwoofer
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