I am looking at options to fit a subwoofer into my HSE. I now have an Android head unit (Superb) running the factory amp number XQK000020. All the factory speakers work ok but mine never had a factory Sub. From what I read some HSE`s had the mid system like mine with the amp but also a Sub. My question is does my amp already have a sub out channel? If so any idea of the pin out or wire colours or better still is there a plug somewhere for the SUB. As usual I cant make head nor tail of wiring diagrams so am again asking for help. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

As you have changed the head unit, you may have RCA pre-outs at the back of it.
At least this way you can install a mono amp and subwoofer and control it independently.