I just thought I might as well finish my article as much as I can.
LESSON 3 : Install under seat subwoofers.
Installing the speakers should be the easiest bit of the entire process if you have the right speakers. The EARTHQUAKE SWS-8 8" SHALLOW MOUNT are the best for the job because they fit perfectly inside the enclosures under the seat.
I found the easiest way to get to the enclosures is by removing the 4 large Hex nuts from the seat rails and then simply tilting the seat back. Then remove the speaker grill.
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Next you need to remove the speaker screws. You may find it easier to remove the trim holding the carpet down to get to the outer screw.
To get to the screw near the pillar simply put your screw driver into the hole in the carpet which allows the grill screw to pass through. Much easier than having to open up more carpet. Once all 4 speaker screws are out you need to slide the speaker out towards the front.
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The speaker is connected to the car's wiring harness via an OEM plug. You can buy two Pin Housings BMW Part No 61136901731 and four contacts BMW Part No 61138364835 and then insert them into the plug. This will give you access to the speaker cables.
The Earthquake speakers have normal terminals but one is a miniature one. Use two Fully Insulated Crimp - ‘Lucar’ Female Terminals for the earthquake speakers (Maplin's code JH81C and N22AN). Connect a 2.5mm gauge wire between the Lucar Terminals and the BMW contacts 61136901733. That way you don't have to slice the cables or remove any plugs etc.
Put everything back and then tune your system. I'll post more pictures when I actually replace my subs. But for now this project of mine is on hold because I can't simply replace one sub.

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