durwood

Depends on if your door panel is still creating cancelations.

It definitely isolates, but at a cost of a loss of output ~3db where the energy is turned into heat.

If you need more midbass there are several options:

1) Enclosure if it's a low Q driver (QTS=0.2-0.4)
2) More power (depends if the driver can handle it)
3) More excursion (depends on if the driver has more to go or if it's already maxxed out)
4) Larger driver or more cone surface area (double up on drivers)

Not sure what frequency range you are using them in either.

Proper blending with the subwoofer will help you in the illusion of upfront bass. Time alignment and/or phase adjustment and proper crossover filtering can help with this.

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