Upgrading my room and selling a couple of my Studio Converters. Universal Audio Apollo X6 rack & Apollo Twin Quad MK II  dark grey desktop interface package.  Both ship in their original factory boxes with documentation, PSU's, & includes 2 Thunderbolt Cables, as well as 1 Thunderbolt 2 to Thunderbolt 3 adaptor, to connect these two together offering cascading units and maximum plugin processing power with incredible sounding A-D and D-A converters.  Both units are in excellent condition, operate flawlessly, and come from my non smoking private studio with only minimal use as I have multiple other ADC/DAC converters. A suite of Factory UA plugins also come with each of these and and I will transfer the interface(s) ownership to your new or existing UA account after your purchase. I can separate these units if interested. Hit me up on my site chat or via email. Only The Apollo X and Apollo Twin Quad are included in the sale. 
2600$ for both shipped to the lower 48