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      02-16-2013, 02:28 AM   #22
zetti PL
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Poland
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Drives: E85 3.0si & E89 23i
Join Date: Oct 2007
Location: Poland

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Just finished my upgrade from standard 6 speaker to 16 speaker system (added additional two tweeters in back that have place, but are not put in the factory).
A lot of work to put all the trims away
Wiring is simple - the most tough was to put ACC wire to the fuses and extend original cables to the front central (this part of loom I didn't have)
Front speakers are not so bad - great improvement vs standard.
The only problem is back - subs are very weak.
If you set fader to the back almost no sound is coming from all of the speaker (central rear, subs and mid ranges)
Temporarily I powered them from external amplifier but it was little improvement so I left them feeding from std Top HIfi amp.
If want to improve you have to change subs. Top hifi subs are to small to produce good bass.
I will try to put new software to Top Hifi amp, but having read opinions it brings only small improvement.
Appreciate 0