I had to send my X3 back to line6 for a factory repair(out of warranty too

) but my band is opening for Bootsy next friday and I dont know if I will need to rent an SVT head or not. Can anyone tell me how to use a standard DI as a preamp? I use a crown xti4000 power amp with SWR 8x10 megoliath cab. The crown only has XLR inputs. How would(could) I wire that?