Vision Insight+ DAC (Upgraded)

The Vision Insight+ DAC has been upgraded from its factory design to deliver the ultimate listening experience. This unit was upgraded by Frank using the OPA627AP chips.  From the original listing: "The Insight+ DAC is designed using the circuit simulation and math capability we have been developing for the past 15 years. Thousands of hours of original advanced math and circuit analysis programing went into modeling the complete circuit from digital input to audio output. Our results show, more clearly than ever before, every nuance of the circuit performance. This allowed us to understand all significant (and not otherwise predictable) non-linearities, and then model improvements into the circuit. After multiple iterations of improvement, testing, modeling, and analyzing, we are convinced the circuit is as perfect as possible. Thus was born the Insight DAC, easily the best piece of solid-state audio equipment we have ever designed, and likely the best at any price from any audio manuf