The ERCO headphone DAC/AMP can be upgraded with HYPSOS Hybrid Power System, the same way as flagship model OOR. Using our proprietary Ferrum Power Link (FPL) connection, both units perform to their highest levels. While ERCO performs very good right out of the box, it is made to excel above and beyond when used together with HYPSOS. Using the FPL connection means HYPSOS can measure very deep inside ERCO than it can with any other product. Not only does HYPSOS work better in this combination, ERCO will also perform even better than it normally does. The truly balanced design of the preamplifier stage coupled with the IC power amplifier technology in combination with the implementation of highly selected components is elevated to a level of its own.