Does anyone know if it is possible to use a sub woofer with this stereo.

Yes but only if the sub has a high pass input as the radio dose not have a sub output.

19 minutes ago, cjay1 said:

Yes but only if the sub has a high pass input as the radio dose not have a sub output.

Is speaker level input the same thing?

1 hour ago, ToXIcG said:

Is speaker level input the same thing?

Yes all it does is allow you to tap into the factory speaker wiring 

yes i had one on mine till i took it out last week, you have to splice the wires on the plug on the back with connector blocks, easy enough to do, dont run the power cable and the audio cables along the same door as it will interfere, i ran my rower from battery through the passenger side, then my audio wires from unit, through the drivers side.

Do it as Alexbartlam has said I’ve also done mine like this 👌👌

Just out of curiosity but how would you wire a sub for a mk6.5 fiesta? My dad has a small under seat sub which he took out his car. For some reason the remote stopped working which hopefully would be sorted by looking at the wiring. Just have to find the remote as it's been misplaced somewhere. 

Same way mate. Just hook into speaker wire. Then have a remote wire there Along with the power wire. Then also plug in the audio cables