13
SUBWOOFER CONNECTION
SAFETY PRECAUTION:
Before proceeding with this section be sure to read and
follow all safety precaution instruction notices at the beginning of this manual.
Turn all components OFF before connecting the subwoofer.
Ensure subwoofer is installed in a location where any rear amplifier parts
(panels, heatsinks, etc.) cannot be accidentally touched.
We recommend the use of high-quality cables and connectors when hooking up your subwoofer
(see
your Dealer).
Low-Level Input
(Fig. 8)
(For use with a receiver, processor or control unit with a Sub-Out/LFE-Out jack.)
Using an RCA-to-RCA interconnect cable connect the subwoofer using the Right (Mono) input as
shown in Fig. 8.
SETTING SUBWOOFER CONTROLS
When setting up your subwoofer and fine tuning it with your system, use music and video soundtracks that
you know well. They should contain selections with extended bass that is continuous and repetitive. Set any
tone or equalizer controls on your receiver or preamplifier to flat (zero) and switch any loudness controls off.
Room acoustics vary. Experiment with subwoofer placement to find the best position. Certain
subwoofer positions may cause some bass frequency cancellation—when your speakers and
subwoofer are “out-of-phase” they work against each other through the crossover region and bass
is reduced. If bass sounds “weak” or “dislocated,” change the phase according to the instructions
in point 4, below. When adjusting your subwoofer, remember that bass should not be overbearing—
the subwoofer should not draw attention to itself —but it shouldn’t be “thin” or difficult to hear,
either. Use the following set-up tips to fine-tune subwoofer bass in your listening room:
1.
Turn the
Subwoofer Cut-Off Frequency Control
to the middle of the
“Normal”
range.
2.
Slowly rotate the
Subwoofer Level Control
until you match the subwoofer output level
with the level of your speakers. Bass should be clearly audible but not intrusive.
3.
If the sound is too “thin” set the
Subwoofer Cut-Off Frequency Control
higher than the
“Normal” range; if the sound becomes “boomy” set the
Subwoofer Cut-Off Frequency
Control
lower than the normal range.
4.
If the bass sounds weak or “dislocated” you may have a phase alignment problem. Your Cinema
™
subwoofer has a
Phase Switch
which is normally set to the 0° position. Switch it to the 180°
position—this will switch the phase of the subwoofer by 180° relative to your speakers. Listen to
determine if you hear more bass. If you don’t hear more bass, return the Phase Switch to its original
position and then experiment with subwoofer placement to find an area of the room where there is
less bass cancellation.
