Powering Up Subwoofer; Operating Controls - Definitive Technology ProSub 800 Owner's Manual

Operating Controls
Your Definitive Technology ProSub subwoofer is equipped with a full
complement of operating controls to ensure complete flexibility and maxi-
mum 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 side 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 sub-
woofer 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 filter fairly low (40-70 Hz). If you are connecting
your ProSub using the "LFE In" tum the low pass filter all the way up in
order to get optimal impedance matching.
When using the ProSub with
Definitive ProMonitors, please consult the instruction manual section
"Using the ProSub with Definitive ProMonitors."
Powering Up Your Subwoofer .
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 tum off a little
while after the signal is discontinued.
The ProSub 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. 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 may hear a
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 you may
hear a pop which is normal. If you unplug the speaker or turn off the AC