i am wanting to upgrade my system and need some advice. i hope to install a kenwood kdc715s HU and 4 polk dx7 speakers. i was not planning on an amp (should i?), and no subs either. what do you think? any oppinions welcome. thanks in advance!

 

The equipment sounds good. Easy install. I am partial to adding at least a small amp and sub, because the polks lack good bottom end extension. I would also add sound deading material on the speaker openings(even though the doors have factory material already). this will keep the speakers from vibrating the doors and help out with their bass output some.