: The 2 will sound better then the one. : But again the box will make or break the sound quality etc.. : If you go with 2 just make sure the box is made well, and accordingly to measurements.
Im not sure exactley but the JL Steal Box does not come with a 10 W0 it comes i believe with a 10 W6? Which is a much better sub capable of holding much more power, etc. I asked the same question to a guy at a local car audio place and he told me that the stealth box would give you much better quality sounding bass at the same volume level or a little bit more than two JL 10 W0s in a custom box (exactley what i have know cause it was cheaper). But If i had the money i would have a stealth box just for the extra room it gives.