What I think that you're not understanding is that there are so many variables that nobody can give you an exact answer. The jeep has less airspace, so in theory you would think that it would be easier to pressurize. But, you also have to take into account the asoustics of the vehicle and the way everything is setup. Just because it's the same equipment doesn't mean that that it will react the same way in both vehicles. Different vehicles will prefer for the equipment to be set up in different fashions. Therefore, it's hard to give you an exact answer. The word "variable" is so important in car audio, you just have got to realize that.