OPERATING THE HKSUB 12 SUBWOOFER 17
OPERATING THE HKSUB 12 SUBWOOFER
Power
Press the
Master Power Switch
⁄
(marked
Power
) at the “•” (On) marking.
The HKSUB 12 subwoofer will automatically
turn on or go into Standby mode, depending
on whether or not a signal is being sent to it
by your receiver or surround processor, and
provided that the
Music-Sense On/Off
Switch
§
is moved to the left so that it is
in the
AUTO
position.
When your receiver or amplifier is off, or is
not sending program material to the sub-
woofer, the subwoofer will be in Standby
mode and the
LED Indicator
¶
on the
amp panel will turn red. When the subwoofer
senses an audio signal, it will automatically
turn on and the
LED Indicator
¶
will turn
green. If the subwoofer does not sense a
signal after approximately fifteen minutes,
it will automatically go into Standby mode.
When the
Music-Sense On/Off Switch
§
is switched to the
ON
position, the sub-
woofer will remain on, whether or not pro-
gram material is playing.
When you are away from home for
an extended period of time, switch the
Master Power Switch
⁄
to the
OFF
position to prevent accidental activation of
the HKSUB 12.
Volume
Volume may be adjusted using the
Subwoofer Level Control
‚
, as
shown. Turn the control knob clockwise
to increase the volume of the subwoofer,
and counterclockwise to decrease the
subwoofer’s volume.
The
Subwoofer Level Control
‚
adjusts
the volume of the subwoofer relative to the
rest of the system. Proper level adjustment
depends on several variables such as room
size, subwoofer placement, type of main
speakers and listener position. Adjust the
subwoofer level so that the volume of the
bass information is pleasing to you.
Additional Bass Adjustments
In addition to the volume adjustments
described above, the HKSUB 12 subwoofer
includes a
Crossover Frequency Control
ª
, a
Filter Switch
•
and a
Phase
Switch
∞
that can be used to adjust the
bass response to suit your listening environ-
ment or taste.
The
Crossover Frequency Control
ª
determines the highest frequency at which
the subwoofer reproduces sounds when the
Speaker-Level Inputs
¡
or
Line-Level
Full-Range Inputs
£
are used. Consult
the specifications for your main speakers on
page 19 to determine the lowest frequency
they are capable of reproducing, and set this
control slightly above that frequency. For
example, if the specified frequency response
for your HKB 4 main speakers is 80Hz –
20kHz, then set the
Crossover Frequency
Control
ª
slightly to the left of the
100Hz
marking on the HKSUB 12’s
amplifier panel.
The
Crossover Frequency Control
ª
has
no effect when the
SUB Input
¢
is in use,
or when the
High-Cut (Low-Pass) Filter
Switch
•
is in the
OFF
position.
The
High-Cut (Low-Pass) Filter Switch
•
limits the frequencies of the audio signal
inputted to the subwoofer to the low
frequencies that the subwoofer reproduces
best. This allows the subwoofer to perform
more efficiently and with superior bass
reproduction, minimizing distortion that might
occur if the subwoofer attempted to repro-
duce higher frequencies. This switch should
be left in the
ON
position,
except
:
1. When the
SUB Input
¢
is being used,
in which case it has no effect, or
2. When the
Speaker-Level Inputs
¡
or
the
Line-Level Full-Range Inputs
£
are
being used with a crossover or filter aboard
the receiver or processor.
In these two circumstances, place the switch
in the
OFF
position.
If your receiver or processor allows you to
select the crossover frequency for the main
speakers, choose the setting just above the
lowest frequency the main speakers are
capable of reproducing. This will send the
low-frequency portion of the signal to your
HKSUB 12, which is best able to reproduce
these frequencies with greatest efficiency
and minimal distortion. In this case, you may
use the
SUB Input
¢
connection, or if
that is not compatible with your receiver or
processor, place the
High-Cut (Low-Pass)
Filter Switch
•
in the
OFF
position in
order to avoid filtering the signal twice, which
may lead to signal loss and distortion.
In most situations, the
Phase Switch
∞
should be left in the
NORMAL
position.
If you suspect that the subwoofer is playing
out of phase with the other speakers, which
would tend to diminish bass response, try
placing this switch in the
REVERSE
position. There is no harm in experimenting,
and you may return the switch to the
NORMAL
position at any time.
If you rearrange your room and reposition
the speakers, it would be a good idea to
check whether they are in phase by
flipping this switch.
MIN MAX
Subwoofer
Level
MIN MAX
Subwoofer
Level
