5) Low level input from amplifier
1) Volume control
2) Low pass crossover control
(variable 50Hz-100Hz)
3) Phase adjust 0 - 180
10) Mains switch
6) Line in/out from/to amplifier
(Line IN/OUT)
11) Mains cord (230V)
7) Speaker Level input
(from amplifier)
12) Fuse
(placed under)
4) Standby mode switchAuto or ON
9) ON/OFF indicator
8) Speaker Level output
(to satellite speakers)
To reduce the risk of electric shock, do not open or remove cover or back. Do not expose this appliance to rain or moisture. In case
of malfunction consult qualified service personel.
The lightning flash with arrowhead, within an equilateral
triangle, is intended to alert the user of the presence of
uninsulated "dangerous voltage" within the product´s
enclosure; that may be of sufficient magnitude to constitute a
risk of electric shock to persons.
The exclamation point, within an equilateral triangle, is intended to alert
the user of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
Congratulations to your choice of Audio Pro subwoofer and to a new sound experience.
Audio Pro subwoofer is a unique product built with advanced technique. It is very easy to handle and install. It is
equipped with the unique Audio Pro ace-bass technique combined with the built-in amplifier, the long throw woofers
and the extremely solid cabinet offers a natural and deep bass reproduction at sound levels you never thought
The Audio Pro subwoofer offers extraordinary performance and lots of possibilities. In order to get the most out of
your new subwoofer, we recommend you to spend time and carefully read these instructions before you connect and
start up your system.
What is ace-bass ?
Normally, speaker design is bound to follow the laws of physics. The consequence will be, to get deep bass, the
speakerbox must be very large. With the ace-bass technique we can "change" the laws of physics in the way that the
driver believes it is placed in a much larger speaker box.
Furthermore, the ace-bass technology improves the driver performance. With the ace-bass technique, we can design
smaller subwoofers with deeper and cleaner bass.
Carefully unpack the Audio Pro subwoofer and check for any damages. If possible, keep the cartonbox if future
transportation is needed.
You should immediately contact your dealer if the subwoofer is damaged .
There are different methods to connect your subwoofer to a HiFi / Home Theater system. In the following we
explain different ways. NOTE! Do not connect the mains cord until all other installation is completed.
2.1 To an amplifier / pre-amplifier with Subwoofer-out terminal, or pre-out/ main-in
Connect the enclosed cord from the subwoofer-output of your home cinema amplifier to LFE IN on the
subwoofer. When the LFE input is used, the built in Low Pass filter in the subwoofer is bypassed. You can also
connect to Line IN. (Then use the enclosed Y adaptor). In this case the Low Pass filter is in use. You can
adjust upper frequency between 50Hz to 100Hz. If you have a Dolby Pro Logic amplifier, you must connect it’s
Sub out to the Line IN of the subwoofer.
It can also be connected by using the Pre-out/Main-in from a two channel preamplifier/amplifier. The audio signal
is now connected from the Pre-out terminal to the Line IN on the subwoofer. By using the Low Pass control, the
upper frequency of the subwoofer can be continously adjusted from 50Hz-100 Hz. Signal is brought back to the
amplifier from Line OUT to Main-in on the amplifier.
Note: This connecting method requires 2 sets of RCA cables. These are not enclosed.
2.2 To Speaker output terminal (High level)
Connect speaker cables from the speaker terminals of your amplifier to the Speaker Level input of the subwoofer.
Carefully check the polarity of the cables (+ to + and - to -). Connect both Left and Right channels. The satellite
speakers are connected to SPEAKER OUTPUT on the subwoofer. Again, carefully check the polarity (+ to + etc).
In this installation, the satellite speakers HIPASS crossover frequency is automatically set to 100 Hz. If you want
the speakers to perform full frequency range, connect them to the main amplifier Speaker Output.
Power switch (10):
LowPass (2):
To switch the subwoofer amplifier to ON or OFF
mode. Make sure it is turned OFF during installation.
Turn OFF the subwoofer when it will not be used for a
longer period of time.
The Lowpass crossover frequency can be adjusted
continously between 50 and 100Hz. This gives you a
unique possibility to perfectly match the Subwoofer to
your satellite speakers. The lowest frequencies will be
reproduced only by the subwoofer.
Standby switch (4):
Note: When the subwoofer is connected via LFE,
the Low Pass filter is bypassed.
In Auto mode: The amplifier enters automatically the
standby mode if no signal has been detected for about
20 minutes. It automatically enters ON mode when
signal is detected again.
Phase adjustment (3):
The placement of the subwoofer can have effect on the
phase between subwoofer and speakers. With the
phase adjustment the phase can be adjusted
continously 0 to 180 degrees.
In ON mode: The amplifier will be permanently ON.
Main Power indicator: (9)
The red indicator shows if mains switch is ON or OFF.
Red light - subwoofer is ON or in standby mode.
Power indicator: (Blue on front)
The blue indicator shows the operation status. Blue
light on - the subwoofer is on. Blue light off - the
subwoofer is either OFF or in Standby mode.
Volume control (1):
The output level of the subwoofer can be adjusted. Use
the Level control carefully, remember that program
material may contain very high energy.
If you should face any problem with the subwoofer function, please check following points.
If the problem remains after checking these
points, please contact your dealer.
Your Audio Pro subwoofer is designed to
produce music information in the frequency
range below 100 Hz. The human ear is being
devoided the ability to localize sound of these
low frequencies why the placement of the subwoofer is not critical. Audio Pro subwoofers
steep lowpass filters make the placement
easier to fit into your listening room. However
you can use the nature of the acoustic laws in
the following ways:
To get the most amplification of the room itself,
place the subwoofer close to a corner at a
distance of about 10 cm from the walls. If you
get too much bass, move the subwoofer slightly
out from the corner.
By experimenting with the placement of the
subwoofer, you can optimize the sound quality.
Just moving the subwoofer 0,5 M can
dramatically chamge the sound balance.
One good rule is to place the subwoofer at the
same wall as the satellite speakers.
Never cover the subwoofer or place it where the
built-in amplifier will be covered.
Check that all connections have been made
properly. Check if any of the cables are
damaged or short-cirquit.
Audio Pro subwoofers has a sophisticated
overload protection. This protects your
subwoofer from damages caused by too high
volume setting.
Amplifier(RMS): ......................................500 Watt
Passive radiator.........................................10"
Side woofers:................................4 x 5 1/2”
Frequency range:....................................18-100Hz
Lowpass filter:...............50 - 100Hz, 36dB/octave
Highpass filter:........................100Hz, 6dB/octave
(W)..................................350 mm
(H)............................380 + 10 mm
(D)...........................350 + 21 mm
Weight:(net):..............................................15,2 Kg
Specifications may be changed without notice, Audio Pro
follows a policy of continous advancement in development
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