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I have the basic setup on my 530e (G30) and thinking of upgrading the subs under the seats with sound deadining insulation.
I am also looking to change the midrange and add the dreaded tweeters. I would like recommendations from you for 3rd party setups, aside from the obvious HK / B&W / Bavarian as they are ridiculously priced and I am not a footballer nor Lord Sugar.
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