The biggest factor contributing to the boominess is the bandpass box they are in. They are inherently boomy within a certain frequency range and pretty crummy on the rest. Coupled with the fact alone that its a hatchback car adds to this. Also, having used all JL subs before, I can tell you the W0's (their entry level offering) are the least musical of the bunch. If it is an option, see if you can get him into a single 10W6v2, as they are vastly more accurate.
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