the D10 is a very different design from the d50. unfortunately it has limited voltage swing, so it won't play as loud, but it is actually push pull so it has a better high end. The D10 with sr-002 and the shure kse1500 are my favorite portable electrostatics. Both beat the koss and kingsound by a wide margin. See elsewhere for pictures on the new monoprice electrostatic portable. Absolutely awful and a waste of money.