The Stax SR-007 Omega II Headphones have a unique new electrode structure visible through the outer case, gold plated on the outer edge this new electrode has less holes than conventional STAX Earspeakers and thus provide an increased diaphragm vibration area allowing for rich and powerful sound yet retaining all the delicacy STAX is famous for. The price shown includes a Stax Vacumm Tube Energiser which is needed to operate these fantastic headphones. headphones cost £2,490