Land Rover Repair: about the radio wireing, factory radio, original radio

Question
I got the radio out and all, however, the next radio that I would like to replace the old one with is lite but could not get the wiring for the speakers. I notice there are thee plugs in the back of the original radio one is for the DC+ and DC- and DC++ (continuously) now, the two other ones, I thought that the one with all (4) the black wires tied together to one black wire and with the four other colored wires was the plug for the speakers, now, tell me if I am correct or not please? what I find dumm to me is the third plug! is it for a sub Amp or for the tweeter? Is there an amplifier on the system? Thank you so much for your enlightenment to this puzzle. I removed the factory radio thinking it would have been a piece of cake for me to just install this other radio that I had in storage but now I still don't have a radio and now a big hole in my dashboard.

Answer
The answer to your question is contained in the factory electrical manual.  You can buy a day's access to the manual at www.landrovertechinfo.com  I strongly suggest you do that, and download and print all the relevant diagrams and removal-refit instructions.  It's all in there.  Access is $15, I think, and well worth it as you get full access to all manufacturer infor for your truck.