Violectric HPA V281 high-quality headphoneamp with balacanced ! headphone outs, bal- and unbalance In/Outs with XLR and RCA (goldplatet contacts), line outs configurable and fixed/variable (pre/post fader), 6 ...

"SPL Pro-Fi Phonitor e black & DA converter 1670 (USB, Coax, Optical)- 120 V Rail headphone amplifier with VOLTAiR-Technology- Suited for all headphones with impedances