I just noticed on the Cayin website that the N5 has a 'Bal' (Balanced) output for "Balanced Driven 2.5mm Headphone". Does anyone know if those are available in an earphone/earbud? I can't seem to find any anywhere. Is the 'balanced' configuration only available on headphones? Who makes those? Or is the 'Bal' output for future headphone/earphones that just don't exist yet?