Positioning the speakers

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Hi to all!
I have a little Autobianchi Y10 with 2 Kenwood speakers (2 way) anterior, with a 35W*4 JVC cd player. It runs optimal!
If I position 2 tree-way speakers rear mounted vertical on the panel and a subwoofer, can I obtain a good sound?!?
What type of subwoofer do you.....think?!? Normal or long....
And power?!?
I want to plug an amplifier for this speakers (sub and 2 tree-way rear)! Can I connect it to the rear output of the cd player with RCA plugs?!? What type of amplifier I need? three channel?

Help me, please!

Oscar from Italy
 
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