Helping out a buddy do a small setup in his daily driver. He is limited on space,so putting a bigger or ported box is out of the question. He listens from everything from rock to rap.His amp does 600rms @ 2ohms. The box is a prefab.He can either get one with .60 cu ft or .75 cu ft. Let me know which one would work best. I have been looking at the level two,but wasn't sure if there would be a better choice,say a lvl 3. He likes loud,but with decent sound if the two can go hand in hand. Enclosure takes a 10" Thanks in advance.