SV Sound SVS Subwoofer PB12-Ultra - Manual (Page 8)

SV Subwoofers
Page 8
ion is the difficult job of the phase control. Essentially, “phase” varies the timing of
the bass waves coming from the sub. But don’t despair if you don’t hear much differ-
ence with changes to the phase knob — the effect of bass cancellation will vary by
volume and frequency in your room, and no single setting is likely to ever be
“perfect”. One simple technique to optimize phase is to find a nice “bassy” loop
(such as the menu of the “Godzilla” DVD) and measure SPL response at various
bass peaks. As the loop runs, you can have an assistant adjust the phase control.
When you see the most response on a given bass passage, typically that’s the setting
with the least room-induced cancellation (for the frequencies of the demo loop).
L
ine
I
n/
O
ut. Use either one of the sub’s “Line In” jacks to connect the subwoofer
to the output jack of your receiver/processor. Feeding just one input is enough. If
you are using a conventional amp and/or a stereo setup you can use the “Line Out”
jacks to send sound (filtered of deep bass information) back to your system amp. A
simple RCA to RCA cable is all you need for either type configuration.
A
uto
O
n. Your sub allows an “Auto On” mode… or can be on all the time. With
the switch in the “Auto” position your subwoofer will “sense” that a DVD or CD etc.
has begun and switch on immediately (the “hard power switch” mentioned below
must be on, naturally). A few minutes after a movie finishes, the auto-on light will
turn red, switching the sub back off. When running (and sensing a signal) the auto-on
LED will be green. Sometimes, with very low listening levels, your subwoofer might
not get enough of a bass signal from your surround sound processor to “trip” the
auto-on circuit. Should you ever find this to be the case you may leave this switch to
“On”, or turn the receiver’s subwoofer output up, and the sub’s volume down.
C
rossover enable switch. If you allow your DD/DTS surround-sound receiver
or processor to manage bass frequencies (again, highly recommended), this switch
should be set to “Disabled”, eliminating the effects of the “Crossover Frequency”
knob and allowing your sub to reproduce just what it’s fed from the receiver. If you
use the sub in a two channel (stereo only) configuration, then “Enable” the crossover
and adjust the knob to best blend the sub into the output of your speakers.
H
igh level inputs/outputs. Not commonly used today, but binding posts are
there in case you don’t have low-level inputs/outputs on your receiver/processor.
Typically utilized only if you are not using a DD/DTS compatible system.
P
ower. This heavy-duty two-position switch next to the power cord will com-
pletely cut the power to your sub amp. Flip this switch to off before you ever move
the sub or change inputs or outputs.
A/C
connection. Plug your sub into a dedicated A/C outlet. “Convenience”
outlets of typical receivers often don’t provide the needed current. Avoid them.
F use. User replaceable, contact SVS if you have trouble finding one. The fuse can
be accessed by a small round door immediately next to the power cord fitting.