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ATB120QB

BASS REFLEX ENCLOSURE SUBWOOFER

INSTALLATION & OPERATION MANUAL

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:

Standard 1 x 4 ohms

1 x 1 ohm parallel

Standard 1 x 4 Ohm

1 x 1 Ohm parallel

VC 1

VC 2

VC 1

+ -

Amp

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.

EU Legal Representative: ACR S & V GmbH, Industriestr. 35, D-79787 Lauchringen, Germany

Manufacturer: ACR, Braendli + Voegeli AG, Bohrturmweg 1, CH-5330 Bad Zurzach, Switzerland

Stereo 2 x 2 ohms

Stereo 2 x 2 Ohm

VC 2

VC 1

VC 2

+ -

Amp CH1

Amp CH2

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.

TECHNICAL DATA

Maximum power handling:

Nominal power handling:

Sensitivity (1W/1m):

Frequency response:

Nominal impedance:

Dimensions (H x W x D):

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.

ATB120QB

300 W

200 W

89 dB

45 – 220 Hz

2 x 2 ohms

185 x 365 x 265 mm

Rev.A