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• Gain com pression circuit to protect woofer from over
excursion
• Input overload protection
• Thermal power sensing to protect woofer's voice coil from burnout
• Power on LED (green)
Installation
Your new VA-1215XII subwoofer system provides for a number of
installation options. Read all the installation information below in
order to determine which installation option is best for your system.
Rem em
ber
to pe
rform
all installation
procedures
with
system
power
turned
o
ff
.
Inputs
Your new VA-1215XII subwoofer is equipped with both speaker-
level and line-level inputs. Use the LINE-IN jacks when connecting
your subwoofer to a pre-amp, signal processor, or line-level cross-
over. The FROM AMPLI FIER jacks connect directly to the speaker
outputs of a integrated amplifier or receiver. Your amplifier section
will notice no additional loading effects when you use these inputs
because of their high impedance.
Note
0 0 not
use
both LINE-IN
and
FROM
AMPLIFIER
inputs simuue-
neou
sly.
Volume
control
This control allows you to balance the output from the subwoofer to
the main speakers in you r system. This control should be set to
achieve similar volume
level from both the main speakers and
subwoofer.
Low-pass
crossover
Both sets of inputs sum the left and right channels together and the
resulting signal is passed through an adjustable low-pass crossover
before being amplified. The crossover control allows you to adjust
the upper limit of the subwoofer's frequency response from 40 to
120 hz. The subwoofer's'response will begin rolling off above the
frequency you set this control to.
You should set the crossover frequency to obtain a smooth and
seamless transition from the subwoofer to the main speakers in
yoursystem.
If your main speakers are smaller units with limited low
frequencyoutput,you may wish to choose a highe
rf
requency (such
as 100-120hz) than you would with larger speakers which have
greater low frequency output. With larger speakers, you might start
with this control set lower, such as 80hz.
A bypass switch is also provided if you wish to use an external
crossover.
If you are not using an externa l crossover, we recom-
mend that you use the one provided within the unit for optimum
performance.
Phase
adjustment
This control allows you the ability to compensate for having the
subwoofer in a different location than the main speakers. Ideally,
you will
have the sound from the subwoofer reach the listening
position the same time as the sound from the main speakers.
However, if the distance from the listeningpositionto the subwoofer
and the distance from listening position to the main speakers differs,
the sound from each will reach your ears at
ad
ltterent time.
This control allows the signal to be delayed up to 180 degrees so the
output of the subwoofer will blend in to that of your main speakers
without any cancellation.
Vid
eo/Audio
sw
itch
Many
listeners prefer an "emphasized" low end on movie
soundtracks. This switch sets the VA-1215XII for an additional 3dB
of output when in video mode.
Aut
o turn on switch
The auto turn on switch allows the user to bypass the auto turn on
function if desired. When set in the "auto"mode with main power on,
the VA-1215XII will turn itself on when an input signal is present.
If
no signal is present, after several minutes the unit will shut itself off.
Whe n set in the "on" mode, the auto turn on/off function is bypassed
and the unit will be on wheneve r the main power switch is on.
High pass
cros
s
ov
er
swi
tch
This switch selects the frequency for the high pass crossover. This
cross over is functional on both line and speaker-level outputs.
Smaller speakers with limited low frequency output may prefer the
ccatiaued.. . .