Boston Acoustics ASW 650, ASW 250 Operation, Adjusting the Crossover Control, Audio On/Auto/Mute

Connecting to Electronics Without a Subwoofer Output

If the receiver in your system does not have a subwoofer or LFE output you can connect the subwoofer to a preamp output. Use a stereo RCA cable (not included) to connect the preamp outputs to the “L” and “R” Line Level inputs.

Adjusting the Crossover Control

When using the Line Level inputs (not the LFE input) the subwoofer’s built-in crossover is engaged. As a starting point, set the crossover control on the subwoofer about 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.

Operation

Audio On/Auto/Mute

Plug the subwoofer’s AC cord into a wall outlet. Do not use the outlets on the back of the receiver. Set the audio switch to the desired setting.

AUDIO ON – The subwoofer audio is always on.

AUTO – The subwoofer audio 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 subwoofer is muted and will not produce any sound. You may turn off the main power switch, if you will not be using it for some time or wish to conserve electricity.

An LED indicator next to the Polarity switch indicates what mode the subwoofer is in:

OFF – The subwoofer is unplugged (or the main power switch is off )

RED – Mute (No signal detected, Amp Off )

GREEN – Audio On (Signal detected, Amp On)

The subwoofer will automatically enter the Mute mode after several minutes when no signal is detected from your system. The subwoofer audio will then turn ON instantly when a signal is detected.

Polarity Control

(0° or 180°): Selects regular (0°) or inverted (180°) phase for the 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.

Crossover Control

Adjusts the frequency of the low pass filter for the subwoofer. Note: This control is not active when using the LFE input jack.

Volume Control

Turn the subwoofer Volume control to the 11 o’clock position. If no sound emanates from the subwoofer, check the AC-line cord, Audio On switch, Power switch, and input cables.

Adjust the subwoofer Volume control until you hear a match between the main speaker and subwoofer. Bass response should not overpower the room but rather be adjusted so there is a natural blend across the entire musical range.

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