Low ohms, my m19s came with xovers that copy the original but use foil and air core inductors, audio cap Thetas, Dayton caps and mills and Dayton resistors. The weird thing is that they still use the m19s attenuators. They do sound better than the original ones i have and measured a little flatter. It's a shame you don't have the time for a new project. I have heard a7s a couple of times and although the midrange was great, I prefer the m19s by a big margin. One thing though the two sets of a7s were not modded and were using unacceptable eq. Good luck!!!