Rockford Fosgate 3X - Manual (Page 7)

6. Phase Switch (3X and 5X only)
The phase switch allows easy invertion polarity on the non-faded
output to optimize sound quality.
7. Mounting Holes
The crossover must be mounted on a flat surface. Two mounting
holes in the bottom are used to secure the crossover.
8. Fusing
The crossover has a 1/2 amp AGC fast blow power protection fuse.
If it is necessary to replace the fuse, use only the same type and
rating or the warranty may be voided.
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