A flatter response from a speaker means essentially a more even level of output from the frequencies it is being allowed to play. A larger enclosure and lower tuning will aid in flattening the response and help a little on deepest of notes (more efficient design), but like mentioned above, power handling is effected. But then again, there is the advantage of cabin gain (transfer function) in a vehicle. I should ask why you feel the need to run that much power, are you planning to compete? Reason being, we have people with 10" Dcon's on less then 1/3rd the power you are running, that have their side and rear view mirrors rendered useless when the volume is up. So output on the Icon, in most respects as it is relative to each persons preference, should be quite good when ported with that much power. If you feel the need to run 2000+ watts, the Zcon is very impressive.