I can imagine that the coupe does sound better, considering you have two speakers in the rear to lift the sound. A smaller cabin also helps - wish I had the choice of buying one, but too small for me.
For the people who have to deal with having a sedan, give this a try:
1.Buy a Monster iCable - connector cable. No need to reply with, "oh, it's digital; all ones and zeros (binary). It's not going to make a difference." Just do it. You'll find it at Target
2. Rip one of your favorite albums in iTunes using Loss-less format.
3. Go into the settings of your iPod and enable "Sound Check." Set the "Volume Limit" to a quarter down from maximum. MOST IMPORTANT setting: Set the EQ to "flat." Yes, FLAT.
4. From the head-unit, Bose System, Notch up the bass one or two levels from the middle; notch up the treble, one from the middle
5. Play that album from you iPod.
This should give you some of the mid-base that is not present in the system.
This will peak out the crappy digital amp, which is basically a switching device to keep the power consumption down; never allowing enough current to load the speakers properly.
Don't believe me? Open the hood and look at the battery. My riding lawn mower has a bigger one...
Please reply after the minor tweak, so I don't feel like I'm imagining / exaggerating this whole thing.
