ENxMH = ? – What alien math is this? A collaboration between Enleum and Mod House is what. The latter's Tungsten DS planarmagnetic and Enleum's HPA-23RMH portable headphone amp become a branded combo. In this edition, the headphone uses blue paint for its 3D-printed cups, yokes and rod blocks with grey bolts and the Enleum logo. The grills are produced in Enleum's metal shop. The amp's matching 'H' version packs a new power supply for 35% higher power on its current output port. This combo retails for $5'500 with free shipping from the linked webshop.