Primo EM-172 or Panasonic WM61 does not have differential outputs and cannot take advantage of a preamp with differential inputs. There are no need for balanced connections if you are useing short cables. Naiant Tinybox or Church Audio 9100, could be what you are looking for. For acoustic music needing more gain, Tinybox will be better suited, maybe with Primo EM-173 (lower distorsion than EM-172).
Roger