Congratulations on your purchase of this AXTON enclosure sub-
woofer system. Please read and follow the provided installation
and operating instructions carefully, to benefit from the max. sound
quality and performance this component is capable of. Keep the
instruction manual for any questions that may arise later.
Connect the speaker cable from your power amplifier to the detach-
able terminals on the side panel of your subwoofer. The subwoofer
chassis of the ATB120QB works with a so-called double voice coil,
referred as VC1 and VC2 in the connection diagram.
Thus, the following connection options are available:
WARRANTY CONDITIONS
LIMITED WARRANTY: 24 MONTHS
Warranty Limitations
This warranty does not cover any damage due to:
1. Speaker overload due to excessive or distorted amplifier power
(burned voice coil) etc.
2. Exposure to excessive humidity, fluids, heat, direct sunrays or
excessive dirt or dust.
3. Accidents or abuse, unauthorized repair attempts and modifications
not explicitly authorized by the manufacturer
This warranty is limited to the repair or the replacement of the defective
product at the manufacturer´s option and does not include any other
form of damage, whether incidential, consequential or otherwise.
This warranty will not cover any loss during transportation, transport
costs or any other damage caused by transport or shipment of the
product.
AMPLIFIER ADJUSTMENTS
The utilized amplifier should have a 12 dB / oct. Low Pass Filter
with a control range of < 70 to > 100 Hz. If the Amplifier is also
equipped with a subsonic filter, set this to about 30 - 35 Hz, to
filter out subsonic frequencies.
For adjusting the input sensitivity of the amplifier please refer to
its operating instructions. The general rule is that the bass should
not overdrive even at full volume.
TECHNICAL DATA
Maximum power handling:
Nominal power handling:
Sensitivity (1W/1m):
Frequency response:
Nominal impedance:
Dimensions (H x W x D):
ATB120QB
300 W
200 W
89 dB
45
– 220 Hz
2 x 2 ohms
185 x 365 x 265 mm
VC 1
VC 2
+ -
+ -
Standard 1 x 4 Ohm
VC 1
VC 2
+ -
+ -
1 x 1 Ohm parallel
VC 1
VC 2
+ -
+ -
Stereo 2 x 2 Ohm
Amp
+ -
Amp
+ -
+ -
+ -
Amp CH1 Amp CH2
Standard 1 x 4 ohms
1 x 1 ohm parallel
Stereo 2 x 2 ohms
INSTALLATION & OPERATION MANUAL
ATB120QB
BASS REFLEX ENCLOSURE SUBWOOFER
Rev.A
ACOUSTICAL IN-PHASE CONNECTION
Now find out the in-phase polarity of your subwoofer. A subwoofer
that is not acoustically in phase with the front system plays sounds
limp and listless due to the resulting sound cancellations in the
selected crossover frequency range. On simply reversing the
polarity of the speaker cable at the connection terminal of the
amp, the subwoofer shows acoustically that connection polarity,
which is acoustically in phase: The bass range is getting louder
or just fuller reproduced - this is the right connection variant. If
you follow the stereo connection, please make sure you do the
polarity reversal at both VC1 and VC2. Otherwise, the voice coils
threaten to burn, as they would work against each other.
Now follows the final step to fine tune the bass response through
fine adjustments of the crossover frequency and the input sensitivity
of the amplifier. Generally, a too deeply selected crossover
frequency on your active crossover leads to an unpressurized
sound, while at too high crossover frequency the playback tends
to drone.
EU Legal Representative: ACR S & V GmbH, Industriestr. 35, D-79787 Lauchringen, Germany
Manufacturer: ACR, Br Voegeli AG, Bohrturmweg 1, CH-5330 Bad Zurzach, Switzerland
