Hi group, many DACs (like CS4398, AKM, Sony..) have balanced voltage output. To check how much music really comes out there I connected my balanced HD650 DIRECTLY to the DAC for a moment: guess what...? No noise or any digital artefacts - music almost at full listening level with some SACDs ...

Hi! Just for testing (and for fun) I connected my balanced HD650 directly to the zapfilter's balanced output. WOW! Some questions: 1) What is the best way to add volume control? 2) Are any modifications necessary to make HD650 and zapfilter a perfect match? (changing Impedance, using...