SB 15 (serv.man4) - Harman Kardon Audio Service Manual (repair manual). Page 5

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VOLUME
MIN
MAX
CROSSOVER
POWER
ON
OFF
PHASE
ENGLISH
Subwoofer Rear-Panel Controls
Crossover Knob: This knob adjusts the subwoofer’s crossover between 50Hz and 
150Hz .The higher you set the Crossover knob, the higher in frequency the subwoofer 
will operate and the more its bass will “overlap” that of the soundbar . This adjustment 
helps achieve a smooth transition of bass frequencies between the subwoofer and 
the soundbar for a variety of different rooms and subwoofer locations . See Subwoofer 
Crossover Knob
, on page 9, for more information .
Volume Control: Use this control to balance the subwoofer’s volume with that of 
the soundbar . Turn the knob clockwise to increase the subwoofer’s volume; turn it 
counterclockwise to decrease the subwoofer’s volume .
Phase Switch: This switch determines whether the subwoofer driver’s piston-
like action moves in and out in phase with the speakers in the soundbar . If the 
subwoofer were to play out of phase with the soundbar speakers, some of the sound 
waves produced by the subwoofer or soundbar could be canceled, reducing bass 
performance and sonic impact . This phenomenon depends in part on the relative 
placement of the speakers in the room . See Subwoofer Phase Switch, on page 9, for 
more information .
Wireless Code Switch: Selects between four different channels for the wireless 
subwoofer signal . IMPORTANT: Be sure to set the soundbar’s Wireless Code switch to 
the same channel as you set the subwoofer’s Wireless Code switch . See Wireless Code 
Switches
, on page 9, for more information .
AC Fuse: The SB 15SUB is factory-equipped with a T1AL/250V 1A – 250V AC fuse . If 
the fuse ever blows: 
Unplug the power cord from the wall .
1 . 
Use a screwdriver to remove the blown fuse .
2 . 
Replace the fuse with an identical T1AL/250V 1A – 250V AC fuse .
3 . 
CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE, REPLACE THE FUSE ONLY WITH 
THE SAME TYPE AND RATING .
Power Cord: Plug this cord into an active, unswitched AC outlet . See Power 
Connections
, on page 7, for more information .
Power Switch: Set this switch to the On position to activate the subwoofer . 
In normal operation, this switch will be left in the On position . See Turning the 
Subwoofer On and Off
, on page 8, for more information .
Status Indicator (on top of unit, not shown): Lights blue when the subwoofer's 
power switch is in the On position; lights amber when the subwoofer is in Standby; 
turns off when the subwoofer’s Power switch is in the Off position .
Crossover 
Knob
Volume 
Knob
Phase 
 Switch
Wireless 
Code 
 Switch
Power 
Cord
AC 
Fuse
Power 
Switch
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SB 15/230 Service Manual
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