8
HKSUB 12 AMPLIFIER PANEL CONTROLS AND CONNECTIONS
∞
Phase Switch:
This switch determines
whether the HKSUB 12 subwoofer’s piston-
like action moves in phase with the main
speakers. If the speakers are out of phase,
the sound waves produced by the sub-
woofer will be cancelled out, reducing bass
response. This phenomenon depends in part
on the relative placement of the speakers in
the room. In most cases, the
Phase Switch
∞
should be left in the
NORMAL
posi-
tion. However, it does no harm to experi-
ment with the
Phase Switch
∞
, and you
may leave it in the position that maximizes
bass response.
§
Music-Sense On/Off Switch:
When this
switch is placed in the
AUTO
position, and
when the
Master Power Switch
⁄
is
turned on, the HKSUB 12 will automatically
turn on when an audio signal is present, or
enter the Standby mode when no signal is
being received. When this switch is placed in
the
ON
position, the HKSUB 12 will remain
on, whether or not it is receiving an audio
signal.
¶
LED Indicator:
This LED indicates
whether the HKSUB 12 is in the
ON
or
STANDBY
state when used with
the
Music-Sense On/Off Switch
§
in
the
AUTO
position. The LED is lit green
to indicate that the HKSUB 12 is receiving
an audio signal and is turned on, and the
LED is lit red to indicate that no signal is
being received and the HKSUB 12 is in
Standby mode.
When the
Music-Sense On/Off Switch
§
is in the
ON
position, the LED will be
lit green, whether or not an audio signal
is present.
When the
Master Power Switch
⁄
is
turned off, the LED goes dark, no matter
which position the
Music-Sense On/Off
Switch
§
is in.
•
High-Cut (Low-Pass) Filter Switch:
Placing this switch in the
ON
position acti-
vates circuitry that filters out all audio input
signals above the setting of the
Crossover
Frequency Control
ª
. This allows the
HKSUB 12 to focus its power on reproduc-
ing the low-frequency portion of the signal,
avoiding inefficiency and distortion. Engage
this filter when using the
Speaker-Level
Inputs
¡
, or when using the
Line-Level
Full-Range Inputs
£
, unless your receiver
or processor processes its line-level output
using a low-pass filter. The filter has no
effect when the
SUB Input
¢
is used.
See page 17 for more information about
this switch.
ª
Crossover Frequency Control:
Adjust
this control to set the highest frequency the
HKSUB 12 will reproduce. You should begin
by setting it slightly above the lowest fre-
quency that your main speakers are capable
of reproducing. You may safely adjust the
crossover frequency later as you listen to
different program materials. This control will
have no effect if you are using the
Line-
Level Subwoofer (SUB) Input
¢
, or if
you have set the
High-Cut (Low-Pass)
Filter Switch
•
to the
OFF
position.
See page 17 for more information on
adjusting the crossover setting.
‚
Subwoofer-Level Control:
Volume
may be adjusted using the
Subwoofer-
Level Control
. Turn the control clockwise
to increase the HKSUB 12’s volume, or
counterclockwise to decrease it.
⁄
Master Power Switch:
Press this
rocker switch at the “•” mark to power-on
the HKSUB 12 subwoofer. The HKSUB 12
will then be either in the Standby mode or
completely on, depending on the position of
the
Music-Sense On/Off Switch
§
.
AC Power Cord:
Plug this cord
into an active, unswitched electrical outlet.
The cord should never be plugged into the
accessory outlets found on some audio
components.
12
HKSUB 12 AMPLIFIER PANEL CONTROLS AND CONNECTIONS
