Car radio connector reduction?

I have got myself car radio (there was none in a car when I have bought it)

But the connectors differ. car has antenna connector and two others:

Black http://i.imgur.com/ewW6BBZ.jpg , http://i.imgur.com/4KqArYD.jpg Which judging by two fat wires and bunch of small I believe to be power and external control.

Brown one: http://i.imgur.com/2pPPaoL.jpg , http://i.imgur.com/SGs9ikU.jpg which based on 4 pairs of wires I guess to be speakers (no sub)

while radio: http://imgur.com/RcTWb67 has only the Athena, two classic phono connectors it claims to be for rear speakers http://i.imgur.com/1WUQT9O.jpg and one big socket I assume to be for everything else: http://i.imgur.com/mOUB0on.jpg

I do not care much for remote controls but I see no reasons why radio couldn't use standard low performance factory fitted speakers and be powered by usual 12 Volts

Question:

What are the connectors called ? so that I can get a reduction. I am happy to crimp...