Im buying 2 10" subs, there stats say they can fit into a .5 - 1.0 cu. ft sealed box. I can either buy a .75 cu ft box or .65. What is the difference? Thanks

 

About .1

Basically, the larger you go, the smoother the response will be, but you'll have lower overall output. I hate boomy bass, and knowing how the car audio companies make their suggestions, I'd definately go with at least 1.0 cubic feet per sub if you want a good clean sound. If you don't care how it sounds but want to impress a bunch of teenagers with how loud it is, use a smaller box. .65 to .75 is so close that you'll probably be hard pressed to hear a difference between the two.