Clarion Px-3994a-a Manual [better] [720p 2027]

If your unit has an 8-pin secondary connector, it is for RCA pre-outs (Front L/R, Rear L/R, Subwoofer).

The Clarion PX-3994A-A is an OEM (Original Equipment Manufacturer) head unit typically found in Clarion Px-3994a-a Manual