Car Speakers wont work after installing subwoofers?

[Orion P]

So I installed my 2 12" but after I connected everything the regular car speakers wont work.

 

[fwf43]

You may need an amp. Not enough power .

 

[Patrick H]

Some head units turn off the on board amp when the RCA connections are utilized (not many but I have seen it). Unless there is something else wrong (hard to diagnose over the net) or you can change a setting in your head unit to use both speaker and line outputs, you may be S.O.L.

 

[Unregistered]

i think the rca plugs turn off my other speakers in my pioneer head unit when the rca ports are hooked up to my amp because im experiencing the same problems