so much crap talking, he is asking for help, not to tell him his stuff = trash, while what every you happen to run = god mode.
Kicker L7's are great subs and can make ALOT of bass (for SQ or SPL depending on how you make your box)
you said you got a 3.6 cube box now. That said 3.6 to two subs is only 1.8 to each sub, before you subtract your woofer volume. Not good for SPL.
I agree with most the other people here who say just build your own box. Do some research, learn how to build your own box. you will get alot louder then you are now, and feel good about having built it yourself.
With the dimensions you said you have (35Wx14Hx22D) you have a total volume of 6.24 cubic feet. (L x W x H / 1728 = cubic feet) thats plenty of room to work with for 2 12' subs
with what people were talking about the tuning. Its not set in stone but usually people go for like 27-31 Hz for like a SQ setup (a flatter response,) the 31-35 range is probably good for what you want (daily driver good spl,) and usually you see things tunes at 35+ Hz going for spl, they get a much sharper curve and give you a "boomy" sound. not so great at the low lows (that you will want for the rap you listen too) but a higher output at certain frequencies