Speaking in generalizations, you'll have a slightly steeper rolloff that will start higher in the frequency curve. So instead of having a normal rolloff starting at 50hz with the 1ft^3 box, there will be a slightly steeper rolloff starting a 60hz in the smaller box, resulting in a less powerful low-end...I'm just pulling those frequencies out of my ass to try and illustrate the point that the low end will suffer somewhat. How much, I don't know for sure.