I have a near mint, bone stock EK Civic (except an Alpine CDE-HD138BT and Phoenix Gold amp) that I do not want to modify in order to improve speaker placement. Currently I have German Maestro 6.5 coaxial speakers in the front doors and the sound is pretty terrible since they are aimed at the shins of the driver and passenger.

Would getting a DSP and properly tuning make a dramatic improvement or am I limited by speaker placement?

I thought about kick panels but there doesn't seem to be much room with the clutch pedal being where it is.

I can't/won't modify the car beyond the head unit because it's one of the few EK Civics left on Earth that hasn't been riced out, rusted out, raced, or wrecked.