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11
SONANCE CABINET SUBWOOFERS
Subwoofer Adjustments (see
Figure 10
)
Bypass Switch
The BYPASS
switch bypasses the subwoofer’s internal crossover network
(X
OVER control) and the subwoofer’s L
EVEL control.
If you have connected the subwoofer to a surround processor’s dedicated
Subwoofer Output (
Connection Example #1
, on page 9), set the BYPASS
switch to the ON position. All of the system’s subwoofer crossover and
volume functions will be handled by the surround processor’s internal
subwoofer crossover. Refer to your surround processor’s documentation
for information about adjusting your subwoofer’s volume.
If you have connected your subwoofer to your preamplifier’s Line
Outputs or using the subwoofer’s S
PEAKER INPUTS, set the BYPASS switch to the OFF position. The subwoofer’s XOVER and LEVEL
controls will function (see below).
Xover (Crossover) Control
The XOVER control adjusts the subwoofer’s internal crossover between 50Hz and 250Hz. The crossover’s slope is
18dB/octave. The higher you set the X
OVER control the higher in frequency the subwoofer will operate.
Use the X
OVER control to achieve a smooth transition of bass frequencies between the subwoofer and your main speakers.
Generally, the X
OVER control should be set at a lower frequency if your main speakers have larger woofers, and should be
set at a higher frequency if your main speakers have smaller woofers.
When setting the X
OVER control by ear, listen for the smoothness of the bass. If the bass seems too strong at certain
frequencies (especially if your main speakers have larger woofers), try lowering the X
OVER control setting; if the bass
seems too weak at certain frequencies (especially if your main speakers have smaller woofers) try raising the X
OVER
control setting.
Ideally, the XOVER control should be set to the frequency where your main speakers’ low-frequency response roll-off is
–3dB. However, this is usually impossible to determine without sophisticated test equipment since each listening room has
a different influence on your main speakers’ bass performance.
NOTE: The X
OVER
control does not function when the B
YPASS
switch is in the ON position.
Phase Switch
When the subwoofer’s P
HASE switch is in the 0 position, a positive input voltage will cause the woofer cone to move out
(towards the room). When the P
HASE switch is in the 180 position a positive input voltage will cause the woofer cone to
move in (away from the room).
There is no absolute correct setting for the P
HASE switch. Depending on the location of the subwoofer relative to your main
speakers and seating location, one of the settings will produce a better match with the main speakers, improving bass
impact and in some cases, improving overall bass level as well.
(continued on page 12)
min
Level
max
Phase
0
180
on
off
Bypass
50 250
Xover
Level
Control
Phase
Switch
Bypass
Switch
Xover
Control
Figure 10:
Subwoofer Adjustments