ok well i have 2 12 inch mtx terminators... and i blew my 6x9s and my friend is gonna sell me 2 powerbass s-693 6x9s for 25 bucks.and my other friend is gonna hook me up with 2 infinity 6002i car door speakers.. well is it safe to be runnin 3 diff brands?? and i only have a 400 watt amp cause...