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Message: <blockquote data-quote="erica34" data-source="post: 557615" data-attributes="member: 89"><p>just throwing out a wild idea since i'm not familiar with stereo setup in the z4. i'd probably just add extra thump thump using a single shallow 10-inch or double 8-inch in a sealed box nicely hidden behind rear seats powered by one of those class D amps about the size of a 7-inch tablet. no cutting anywhere or ugly boxes taking up space in the boot. can probably consider earthquake sws that many use to replace stock underseat bmw woofers on e90. not going to give the very low audiophile type bass definition but i think strong hard hitting 50-70hz bass probably matters more in a convertible.</p></blockquote><p></p>