BK Precision P12-300SB-PR Owner's Manual page 6

CONNECTING UP USING THE LOW LEVEL INPUT
Figure 2. Shows a diagram on how to connect the low level input. Using the supplied RCA
to RCA interconnect, plug one end into the P12-300SB-PR low level input and the other
end into the dedicated sub output on your amplifier or processor. If a sub out is not available
then you can use a spare set of pre-amp outputs.
If you only have a single sub woofer output socket on your equipment, then connect up
using one of the pairs of leads (red to red). In this instance use the (Mono) input on your
P12-300SB-PR sub.
Please Note that high and low level connections can be used at the same time if required.
This has the advantage of being able to connect up a Hi-Fi and AV system simultaneously.
Method 2 - To Connect to the Amplifier Using the low level input
FILTER FILTER
In Out In Out
LFE LFE
GAIN GAIN
Min Max Min Max
LOW LEVEL LOW LEVEL
INPUT INPUT
Figure 2.
LFE / Sub Out
LEFT RIGHT
PROCESSOR INTEGRATED AMP / PRE-OUT
(4)