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Hi,
As far as I remember from my E81- I've bought the big ones and it turned out it was either developed to work with Logic 7, cut off at the low frequencies like 100Hz and below, or with the powerful amplifier- the sound was overloaded.
So I've put back my small magnet ones, and just added the tweeters.
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler
F32 bottom V-bar
F80 bottom reinforcement plate
Koni Sport, M-Performance springs, M135i Anti-roll bars
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