I hope that's not going in "Are car," heh heh.
One tip in advance: Make sure that the three tens are not going to overload the Crunch amp. Sounds like a low-buck system to me.
Are the subs single or dual voice coil? 4 ohm or two? And what stability does the amp go down to?
If you have three 4 ohm speakers, and wire them in parallel, you will get approximately 1.333 ohm load. Better make absolutely sure the amp can handle less than a two ohm load, otherwise you're looking at lots of sub cut-out, or worse, a blown amp.
Check caraudio.com for more info. Good luck!
Dave