JBL PowerBass PB12, Service Manual

Page: 6 / 43

PB12
6
PB12 Subwoofer Controls and their Function
1. Power - These lights will be red when the unit is
plugged in and not receiving a signal; when the PB12
receives a signal, the lights will cycle to GREEN. If no
signal is received after 10-15 minutes the lights will
cycle back to RED (standby) until a signal is present
again.
2. Level Control - The subwoofer Level Control, PB12,
(located on the rear panel) adjusts the volume of the
subwoofer relative to the rest of the system.
3. LFE/Normal Switch - Ordinarily placed in the Normal
position - but switch to LFE when playing Dolby
DigitaL, DTS or other digital surround modes - see
page 9.
4. Phase Switch - Changes the subwoofer’s output to
be in phase or 180 degrees out of phase with the
program material.
5. Crossover Frequency - Sets the highest frequency
the subwoofer will reproduce.
6. Line Input - Main Input connection to subwoofer
(preferred).
7. Speaker In Jacks - Main Input connection to
subwoofer when line level, subwoofer, or pre-amp
output connectors are not available, or when a high
pass filter (set at 150Hz) to main loudspeakers is
desired through the Speaker Output Jacks.
8. Speaker Out Jacks - Connected to main
loudspeakers when the Speaker Input Jacks are used.
9. Power Switch - Turns the PB12 on or off.
Rear Panel
Front Panel