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VMS User’s Manual
Y
our new subwoofer is equipped with speaker-level and line-level inputs. Use the LINE LEVEL
jacks when connecting your subwoofer to a pre-amp, signal processor, line-level crossover or
receiver with pre-amp level outputs. The SPEAKER LEVEL jacks connect directly to the speaker
outputs of any amplifier, integrated amplifier or receiver. Your amplifier section will notice no
additional loading effects when you use these inputs due to their very high impedance.
Important!!!
Do not use both LINE LEVEL and SPEAKER LEVEL connections simultaneously!
Volume Control
This control allows you to balance the output from the subwoofer to the main speakers in your
system. This control should be set to achieve similar output level from both the main speakers
and subwoofer when listening to music. A good starting point for the volume control is three or
four dots from minimum.
Warning:
Some manufacturers preset their receivers with the Sub-Out channel signal at a minimum level.
It is very important to verify that your receiver Sub-Out channel is set to the same output level
as your front right and left channels. Refer to your receiver manual for the individual channel
level adjustment procedure. If your receiver Sub-Out channel is set too low, the subwoofer may
appear to have a weak output, it may sound noisy or distorted, and the Auto On/Off feature
may not operate properly.
Low-pass Crossover - 40 to 120 Hz
All inputs sum the left and right channels together, with the resulting signal passing thr
ough an
adjustable low-pass crossover before being amplified. The cr
ossover 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 your system. If your main speakers are smaller units with limited low frequency
output, you may wish to choose a higher frequency (such as 100 -120 Hz) than you would with
larger speakers which have greater low frequency output. With larger speakers, you might start
with this contr
ol set lower
, such as 80 Hz.
A bypass switch is also provided if you wish to use an external crossover.
If you are not
using an external crossover, we recommend that you use the one provided within the unit for
optimum performance!
Phase Adjustment - 0° /180°
This control allows you to “reverse” the phase of the subwoofer’s output signal 180° to correct
for any possible mismatch and r
esulting cancellation between the subwoofer and your main
speakers/amplifier
. To adjust, simply listen to the system with music playing. Then move the
switch from one position to the other and listen for a change in mid-bass frequency output. The
correct position will have a greater amount of apparent mid-bass frequency output.
Installation