How to use the controls
How to use the SUB VOLUME CONTROL knob, CROSSOVER FREQUENCY knob
and PHASE switch.
The VOLUME CONTROL, FREQUENCY knob and PHASE switch can be adjusted to
match the condition of the listening room and/or the characteristics of the left and
right speakers.
Due to the positioning of the subwoofer in the room and the associated room
boundaries, the available bass response from the existing speakers and whether
of not the filtered connection (Nominally 100Hz is used), the actual settings on the
subwoofer control panel will vary considerably.
The SUB VOLUME CONTROL and the CROSSOVER FREQUENCY knobs should be
used together when setting the correct bass response required. For example,
raising the volume level will also raise the effective system crossover point, while
reducing the volume has the converse effect of lowering the frequency range of
the subwoofer. This is caused by the way the various responses and outputs blend
together in the listening environment.
Initially set the crossover frequency fairly low, e.g. 50-60Hz, and use the volume
control knob on the sub to set the low bass level required, When the correct
balance is almost achieved, the crossover level and volume level maybe adjusted
together to fine tune the sound and achieve the cleanest, most extended and
suitably powerful bass.
The ideal is for a seamless blend of extended low bass from the subwoofer leaving
the clean upper bass response of the stereo system largely undisturbed.
Typical Control Positions
Front speaker
Crossover
Phase
Sub Level
Large Speaker
40 - 60Hz
Normal 0°
Medium Speaker
60 - 80Hz
Normal 0°
Small Speaker
80 - 100Hz
Normal 0°
Caution
An excessive input level to the subwoofer may impair the sound quality or damage
the unit. Do not increase the output of the amplifier to a high level while the low-
frequency level is enhanced by the amplifier’s tone control or loudness control.
