Rockford Fosgate AudioPhile LP-1 Owner's Manual page 16

Bandpassing the woofer on a 2x-4
ND-4
+ –
– +
RFA 44/54/64
Tweeter
Output
+ –
400µf
capacitor
– 13 –
2x-4
Woofer
Output Input
– + – +
Input
from
Amplifier