Adding Pioneer TS-WX710A Subwoofer to factory audio system

[SvG]

Hi all, I have a 2015 Mazda 2 GT-M (EU model) and I would like to add an active Pioneer TS-WX710A subwoofer to the factory audio system. I have never done this before, so I have done some research, but still remain with some questions. The subwoofer has an internal hi-lo converter and I am planning to take the signal from the rear speakers. I have found many wiring diagrams, but not of them has the same colour scheme as mine.

Question 1:
This is my TAU connector:



Is it correct that the yellow, green, blue and brown cables near my finger go to the rear speakers and is it here that I can cut them?

Question 2:
Where can I lead the power cable through the firewall?

Question 3:
The sub has a blue/white cable that can switch the sub on when the radio is turned on. Where do I connect this?

Sorry for the n00b questions. There is a lot of info al over the internet but it seems to be very difficult to find some on my car.

 

[thebigted]

1. A friend of mine has used one of these adapters before, cut out one of the back speakers and fit this adapter to connect to the sub using RCA cables https://www.amazon.co.uk/dp/B004UA753G/ref=wl_it_dp_o_pd_nS_ttl?_encoding=UTF8&colid=2PU8IEHF8LCCU&coliid=ITRMI87S6MZC6

2. My power cable runs through this cable system right at the back of the glove box

Just take out the glove box and some other plastic clips and you can feed a power cable straight through here.

3. You can hook up your remote cable to the cigarette fuse box, get one of these adapters :https://www.amazon.co.uk/gp/product/B018PI335C/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1
This will send a current to the amp to turn it on with the ignition. You will end up with your fuse box looking like this:

Hopefully this helps you out and here is mine under the passenger seat :