English Speakers? Audio Upgrade Help!

[silver50]

Hi Guys,

I need your help here again. I am in Edinburgh, Scotland. Due to most big forum's being USA based I cannot find any information. The E65's in the USA do not have the basic E65 hi-fi system with no seperate amplifier. They are all Logic 7 and "hi-fi speaker system.

I would like to add my own amplifier to power bigger subwoofers. I have a pair of Logic 7 subwoofers.

I would like to ask

1) Do the rear speakers have "full range" to provide an output to an amplifier for a subwoofer?

2) BMW wiring diagrams suggest the subwoofers under the front seats are wired in "series" with the front door speakers. This makes it difficult to get an output here for an amplifier.

3) Any information on adding an amplifier to the basic sound system would be very welcome!

I am sorry to come here with no understanding of German speaking but hope you can help.

Many Thanks