A-Series Powered Subwoofer: The
Boston Acoustics A-Series powered subwoofer (ASW 250) incorporates high-quality
components that produce the legendary Boston Sound. The A-Series powered
subwoofer is ideally suited for use in a high-quality 5.1 channel home theater
or stereo music system. The powered subwoofer is capable of impressive deep bass
and high output from a compact enclosure.
Bass Trac Circuitry: The Boston
Acoustics ASW 250 powered subwoofer features Bass Trac Circuitry, a proprietary
Boston-designed circuit that tracks the input signal to the subwoofer and
prevents its amplifier from being driven into audible distortion. As a result,
the bass stays clean and strong at any listening level.
10" DCD Woofer: The Boston Acoustics ASW 250 powered subwoofer is
fitted with a down-firing 10" ceramic/glass fiber polymer woofer cone with Deep
Channel Design (DCD) that allows for higher speed, reduced distortion, and
250-Watt (Peak) Amp: The Boston Acoustics ASW 250 employs a built-in
100 watt RMS (250W Peak) amplifier to drive the preloaded 10" DCD woofer.
Crossover Network: The crossover components in the ASW 250 incorporate
low-loss film capacitors and low-distortion laminated silicon steel cores for
the inductors in all critical areas.
Bass Reflex Enclosure: The
Boston Acoustics A-Series powered subwoofer (ASW 250) features a bass reflex
enclosure with a down-firing acoustically tuned port for improved low frequency
response and efficiency.
Scratch Resistant, Resonance Free Cabinet: The Boston Acoustics ASW
250 powered subwoofer features a high-gloss, scratch-resistant cabinet with a
textured top for a modern styling that will match most any decor. Vertical and horizontal internal bracings reduce cabinet resonances for enhanced audio quality.
Placement: Place the powered
subwoofer next to a wall or in a corner near your main speakers. The sound is
typically best when the subwoofer is within 15' of the main speakers. The sharp
24dB/octave crossover roll-off permits placement farther from the main speakers
if necessary. Since the ear is unable to localize the low frequencies of the
subwoofer, the bass still appears to come from the main speakers.
Experimentation is key, however most positions in the room will work well.
Volume Control: The Boston
Acoustic ASW 250 features a rear-panel rotary volume control. Simply adjust the
powered subwoofer's volume control until you hear a match between your main speakers and the subwoofer. Bass response should not overpower
the room, but rather be adjusted so there is a natural blend across the entire
Crossover Control: When using
the line-level inputs of the powered subwoofer, the ASW 250's built-in variable
crossover (4-180Hz) is engaged. As a starting point, set the crossover control
on the subwoofer approximately 10Hz higher than the lower limit of your main speakers'
bass response. Fine-tune the crossover setting by ear for the smoothest blend
with your main speakers. The best setting of the crossover control will depend
on speaker placement and personal preference.
Note: This control is not active when using the LFE input jack.
Polarity Control: The
polarity control switch lets you select normal (0°) or inverted (180°) phase for
the powered subwoofer. Set this switch to provide the fullest, most dynamic
bass. The effect of phase will be most audible on low-frequency percussion
instruments or music with a continuously repeating bass line.
On/Off Switch: The ASW 250 features a
main on/off switch and 3 power settings.
- Audio On: The powered subwoofer is
- Auto: The powered subwoofer will
turn on whenever a signal is detected. If no signal is detected after
several minutes, it will automatically enter the Mute mode.
- Mute: The powered subwoofer is muted
and will not produce any sound. You may turn off the main power witch, if
you will not be using for some time or which to conserve electricity.
Note: Power is always supplied to the powered
subwoofer's electronics unless it is unplugged or the main switch is powered
off. The auto-on circuitry only activates or deactivates the power amplifier.
LFE/Line-Level Inputs: The Boston Acoustics ASW 250 powered subwoofer
is fitted with LFE and Line-Level inputs for connection flexibility to your home
- LFE: The ASW 250 powered subwoofer is equipped with a dedicated
LFE input to connect a multichannel home theater AV receiver with a
dedicated subwoofer channel to reproduce the special low-frequency effects
(LFE) information contained in digitally-encoded soundtracks. In this case,
you will use your AV receiver's built-in crossover adjustments, and not
the ASW 250's crossover control
- Line-Level: If your receiver does not have a dedicated subwoofer
or LFE output, you can connect the powered subwoofer to a preamp or
line-level RCA output on your receiver. In this case, you will use the
crossover control on the ASW 250.
Note: There are no speaker-level connections.
AC Cord: The ASW 250 includes a 6' detachable AC power cord.
The powered subwoofer's AC power cord should be plugged into
an AC wall outlet or surge protector. Do not use the outlets on the back of your