Boston Acoustics Guide to Connecting Subwoofers and Enhancing Your Sound

Connecting the Subwoofer to Stereo or Dolby® Pro Logic® Systems

For stereo or Dolby Pro Logic systems, the easiest method is to use the same speaker wire connections as shown on page 5. You may also use the “sub out” connection from your receiver to the input on the subwoofer marked use crossover control. When using speaker wire or the use “crossover control” 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 (for Boston Acoustics front speakers, refer to the included “Optimal Crossover Settings...”sheet). Fine-tune the crossover set- ting by ear for the smoothest blend with your main speakers. The best setting of the crossover control will depend on speak- er placement and personal preference.

XB4

Powered Subwoofer Featuring BassTrac®

* use crossover control: removes high frequencies; use with sources lacking suitable filtering (most products without Dolby Digital or THX), or where manual control is desired.

**bypass crossover control: direct to woofer; use with sources having built-in crossover controls or bass management (most products with Dolby Digital or THX).

CAUTION: Disconnect supply cord before replacing fuse. For continued protection against risk of fire, replace only with same type fuse.

ATTENTION: Debrancher avant de remplacer le fusible. Utiliser un fusible de rechange de même type.

120V ~ 60Hz 1.25A

T 1.5A L 250V

		power	line level in
100	125		use	bypass
			crossover	crossover
		0 º	control *	control **
75	150	180 º
crossover	(Hz)	polarity
		speaker level in
	left		right

		CAUTION
		RISK OF ELECTRIC SHOCK
		DO NOT OPEN
C	US	AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR

subwoofer out

back of receiver

Controls

Volume (on top panel): Adjusts the sound level of the subwoofer. A typical setting is around 11 o’clock.

100 125

Crossover (Hz): Adjusts the frequency of the lowpass filter for the subwoofer. This control is inactive when using the “bypass crossover control” input jack.

75150

crossover (Hz)

Polarity (0° or 180°): Selects regular (0°) or inverted (180°) polarity 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.

Power light and power status: The power light turns on whenever the XB4 is plugged into an electrical outlet. The XB4’s auto-on circuitry turns the subwoofer on when a signal is presented, and turns it off if no signal is detected. NOTE: Power is always supplied to the subwoofer electronics unless it is unplugged. The auto-on circuitry only activates or deactivates the power amplifier.

0 º

180 º

polarity

power

6