Back Panel Operations and Connections:
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6. Phase 0-180 Degrees:
0 Degrees = the input signal will be in phase
with front surround speakers. 180 degrees
the input signal will 180 degrees out of phase
from front surround speakers. When the
PRO-SUB12A is positioned on the same wall
as your front speakers keep the PHASE switch
set to 0 degrees. When the PRO-SUB12A is
positioned on the opposite wall from your front
speakers set the PHASE switch to 180 degrees.
7. Power On LED:
When the main power switch is ON this LED
will be green.
8. Ground Lift Switch:
The ground lift switch helps eliminate audio hum
that can be caused by ground differentials
between different pieces of equipment connected
together in the same system. Ground hum is
generally 60Hz hum which is easily noticeable
when the system is turned on. Press the ground
lift switch to minimize or eliminate the hum.
9. Gain:
This is the input level control. Adjust the input
level control to achieve the correct system level
In relation to the other speakers in the system.
Always pay attention to the signal limit LED.
If the signal limit LED is flashing your input level
Is reaching 0dB. If the gain control is set too high
The amplifier will be over-driven. This can
damage the amplifier. Keep you input gain as
low as possible while achieving your desired
sound pressure level.
10. Signal Limit LED:
When the input signal exceeds 0dB the on-board
clip limiter will automatically be engaged. The
clip limiter will limit the input signal to avoid
overloading the amplifier. If the Signal Limit LED
flashes momentarily the input is within a safe
operating level. If the signal limit LED stays lit
solidly adjust the input gain control down.
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