April 2, 2019 at 6:59 am #11322
DC resistance will remain the same if you use the original field coil alone but the inductance will be much lower without the iron in it. I dismantled a 12in speaker to measure the difference. With the field coil in place I get 7.5H and with the field coil alone I get only 1.85H. I guess that it can affect the quality of filtering.
Jean in Montreal