forgot to mention, i dont know how well those level 4s will handle 4k rms a piece... even with the level 5 coils.. i wouldnt attempt more then 2k rms on each of them but thats me, let me know how it goes tho
oh, and i do have 2 15 lvl 4s with lvl 5 coils and they would get warm on 1500 rms a piece...