Newby adding 2 new speakers to installed system

[ChrisXL]

Hey everyone! I'm looking for some help, but I warn you that my questions will probably sound retarded as I'm a COMPLETE newb when it comes to installing any audio in to my car.

A very good friend of mine installed the following system in to my Ford Fiesta:

2x - 17cm Alpine 50W speakers - Front

2x - Soundstream 100W RMS Tarantulas 6x9s - Rear

1x - 1000W (400W RMS) 12" Kenwood sub

1200W Juice 4 channel amp

The front alpine speakers are running off an Alpine CDE-111R

The 6x9s and sub is running off the amp.

My query is:

I have just found to FLI 17cm speakers that I would like to place in my rear door cards, but, as I really don't have a full idea of what I'm doing, i'm not sure what I should hook them up to, the headunit or the amp? To be totally honest, I'm really not sure what I should be doing with ANY of the wiring :/

Any advice on how to include these in to my system would be greatly appreciated!!

Thanks!!

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[skater13 10+ year member]

well first thing you wanna do is disconnect your negative battery terminal, always do this when working on car audio. second would be to remove your door panels (rear ones in this case). after that you need to get your factory speakers out, most likely a few phillips head screws. after that you will need to remove the wiring harness that is connected to them. it should be two wires running into a little harness (positive and negative). snip the harness off, connect the positive and negative wire leads with the appropriate terminals on back of the FLI speakers. mount em in, door panels back on, negative terminal back on battery. hope this helps =]