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Is your amp specified to work on 2 ohms? 2 ohms is awfully low...

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Yep, the sub channel is rated at 2 ohms 390W and is stable at 2 ohms. I'm very pleased with the IX405D. I think one of the empeg guys had the same one in a beetle ?

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But how loud do you play? How much reserve do you seem to have? (How much louder *can* you play compared to how loud you normally play)

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When SWMBO is in the car, not very loud, but when i am on my own, i like it loud sometimes.

It's more a question of quality, i listen to lot of dance music, drum and bass etc, and sometimes the notes are very low. I don't know whether the amp is running out of power or it's just too low for the subs, or maybe the MP3 doesn't have the dynamic range ? It seems that sometimes the bass notes don't get any louder, just the mid and treble, so I think it is running out of steam.

The sub section volume is all the way up, with the bass boost up about 1/3 of what is available.

Also, i am moving to a bigger car (either a RAV4 or a CRV) and I want to maintain the sound levels. Will they drop significantly in a bigger car ?