Yaris Sedan Deadening and Sound system upgrade

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There will obviously be a difference beteen an IDQ 12 and a Hybrid 6 (even if it's ported). I would seriously look at the direction of "fire" on the woofer before makiing permanent changes.

You have to remember that the mid bass shouldn't be affected when your final plan is put into place. look at the difference in the enclosure of the IDQ and the Imagine woofer. You also should consider the tuning frequency of the sub woofer along with the resonant frequency of the car...and correspond the two so that they work together. At what point does your vehicle sound the loudest bass-wise? That will give you a VERY good enclosure and environment to allow the sub to play LOW and loud without even stressing the amplifier one bit.