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Your Definitive Technology ProSub subwoofer is equipped with a
full complement of operating controls to ensure complete flexibility and
maximum performance in any installation. Most of them basically are the
“set and forget” type, although occasionally certain controls will require
minor adjustments.
Gain Control
On the back panel of your subwoofer is a gain (volume) control.
This control is used to raise or lower the output level of your subwoofer
in relation to the other speakers in your system.
Low Pass Filter
Your subwoofer’s back panel features a continuously variable low pass
filter
. This filter is continuously variable between 40 and 150 Hz. This
low pass filter control is used to obtain the optimum transition between
the subwoofer and your main speakers. This control should be set by ear
for best performance in your room. Set it to where it sounds best to you.
If you are running your main speakers full range, we would generally
recommend setting the low pass fi
lter fairly low (40-70 Hz). If you are
connecting your ProSub using the the LFE in, turn the low pass filter all
the way up in order to get optimal impedence matching.
When using the
ProSub with Definitive ProMonitors, please consult the instruction
manual section “Using the ProSub with Definitive ProMonitors.”
Operating Controls
Your subwoofer contains a built-in, active powered subwoofer section
as well as an electronic crossover and so each subwoofer must be plugged
into an electrical socket of the appropriate voltage (as indicated on the
back of your unit) using the plug on the end of the black cord attached to
the electronics module on the back of the loudspeaker. The subwoofer has
a special circuit which automatically turns the powered subwoofer section
on when a signal is fed to the loudspeaker and does not require an on-off
switch. The red LED on the back panel will light up when a signal is
sensed and the amplifier turns on. It will automatically turn off a little
while after the signal is discontinued.
The ProSub has a special circuit which automatically turns the pow-
ered subwoofer section on when a signal is fed to the loudspeaker and
does not require an on/off switch. We suggest plugging the ProSub into a
circuit which is on all the time and not into a switched outlet. When the
ProSub is plugged into a circuit and receives AC current, initially you
will hear a relatively loud pop which is completely normal as the system
first activates itself to stand-by mode. Then, when a program signal is fed
to the speaker it will fully activate itself with a lower level pop which is
normal. If you unplug the speaker or turn off the AC current going to it,
Powering Up Your Subwoofer