I'm selling the Niimbus US4+ ($5999.00 new) and all original accessories including the remote control. The amp has some cosmetic scuffs but is fully functional as it is new. This is one of the best headphone amps on the market. Same amplification as us5 pro ($6599.00). Save a few thousand dollars getting this amp unless you need the 4.4mm on the us5 pro. The amp speaks for itself look up reviews of it.

https://www.headfonia.com/niimbus-us4-review/

Niimbus US 4 and US 4+ represent the uncompromising evolution of the renowned, high-quality headphone amplifiers from Violectric. During the three years of development work, no compromises in circuit design, component and material costs were made to create a headphone amplifier with outstanding audiophile characteristics.

The completely redeveloped channel-separated and 100% analog amplifier circuit features hand-selected audiophile components and has been optimized for lowest noise and highest performance even on very low-impedance headphones. In conjunction with the oversized power supply and the associated high supply voltage you get an extremely detailed and tidy sound that plays in any setting and with any headphone absolutely relaxed and represents every nuance of the music.