E88 Stereo upgrade help

[MerseyRayUk]

Hi,
I've read a few of the posts on here but can't find the answers I'm looking for.

My E88 had the very basic speakers (base system?)
So Ive just purchased and installed the HK front door speakers and tweeters. These are sounding better, but I'm after making improvements.


The things I need to find the answers to are:

1) Where abouts are the front speakers & Subs connected in parallel?
(I want to separate the under seat subs from the front channel so that I can use the HP filter on the door speakers and tweeters, and put the subs on their own amp which will probably end up under the boot carpet next to the battery.)

2) Is there any type of filter already in line with the front speakers/subs. If so, where is it?

3) My HU has DAB+ so what's the best way to get a DAB aerial? Can the existing small aerial be replaced with a DAB compatible one, or would I need a fin on the boot?

4) If I was to add an amplifier in the boot area, does this model already have any wiring loom in that area, or do I need to route all the cables from scratch?

Thanks in advance.