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HKSUB12
AMPLIFIER PANEL CONTROLS AND CONNECTIONS
and should only be used with a filtered sig-
nal. If your receiver does not have a filtered
subwoofer output, you should use the Line-
Level Full-Range Inputs £ instead.
∞ Phase Switch: This switch determines
whether the HKSUB 12 subwoofer's piston-
like action moves in and out in phase with
the main speakers. If the speakers are out
of phase, the sound waves produced by
the subwoofer will be cancelled out, reduc-
ing 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
position. However, it does no
harm to experiment 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
and when the Master Power Switch ⁄ is
turned on, the HKSUB 12 will automatically
turn on or place itself in the Standby mode,
depending on whether it is receiving an audio
signal. When this switch is placed in the
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
or
state when used with
the Music-Sense On/Off Switch § in
the
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
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
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 receiv-
er or processor processes its line-level out-
put using a low-pass filter. The filter has no
effect when the SUB Input ¢ is used.
ª Crossover Frequency Control: Adjust
this control to set the highest frequency the
HKSUB 12 will reproduce. You should
position,
begin by setting it slightly above the
lowest frequency 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
position. See page 14 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 §.
AMPLIFIER PANEL CONTROLS AND CONNECTIONS
¤ AC Power Cord: Plug this cord
into an active, unswitched electrical outlet
for proper operation of the HKSUB 12.
The cord should not be plugged into the
position acti-
accessory outlets found on some audio
components.
4
harman/kardon
3
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