In my three BMW's, all of which have been worked on by MusicarNW, the only Bass solution I ended up being happy with was Jehnert woofers under the seats and a trunk sub for real bass. I had Earthquakes in my e90 and, while they did play lower, they created a mid-bass hole at the hand-off to the mid-range speakers. Trunk sub to Jehnerts to upgraded mid's and tweets, tuned by MusicarNW. It was not cheap, but it has been the best car audio solution I have ever experienced.
Note: the Mid Bass "hole" was clearly in the range of male vocalists with deeper voices. Example: Dave Gahan of Depeche Mode didn't really sound like himself. I was warned about this when we did the Earthquakes but didn't take it that seriously. I wasn't entirely awful, but it wasn't good.
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