Rear speaker cable - now really confused

[KTG1000]

Done some further digging following my last post. Over the left wheel arch I have 2 cables - 1 blue/back the other just black, these both have large spade connectors, both unused. Also found in the braded loom that runs across the top of the tank, 2 further spare cables both with large spades again, this time 1 blue and one black/red. To add insult to injury I then find the spare connector block with 4 speaker wires in the passenger side 'flap' behind the seat. What do you think?!

[Gerrard]

I've just been playing with the solenoid for the passengers door and also found the rear speaker connector block (didn't realise it was installed as standard.) So I guess you can just wire from this to the rear speakers.

But, I also had my head unit out to replace and discovered that I'll need to splice the rear speaker wires as they have conveniently wired them into a connector block behind the dash that isn't in the slightest "iso" standard.

[rj51tvr]

Also whip the head unit out. The stereo should have the stickers on the cables with info on L & R +/- but they change colour at the connector block behind the head unit. Then as youve found, end up in a 4 block in the passenger flap. I found it easiest to cut and crimp connect with a bit of heatshrink to extend the wires.