Read all about this DAC here: https://www.superbestaudiofriends.o...dac-for-750-that-stomps-most-modern-dacs.508/ I'm happy I now have modern instruments to measure this DAC, just out of curiosity. To summarize, I once owned this DAC, sold it, and regretted doing so. @Carlos CPA mentioned he was going to put a souped up one for sale at special member prices when he saw me mentioning my regret. I thought the price he was offering was too low, so I threw in a little extra. (Point is that we have a great community here. We have members who care about each other to the point of things not really being about profit or greed, keeping things in the community to deserving people who as passionate about stuff). Anyway, this Sonic Frontiers SFD-1 MK2 looks to have the level 99 upgrade treatment based on the BOM from https://partsconnexion.com/. For those who do not know, Chris Johnson who started Sonic Frontiers decade ago now heads up pcx. This specific unit sounds more resolving, more neutral, and less syrupy than the one I owned before which only had the level 1 upgrade and possibly an older iteration of the UltraAnalog DAC module. The UltraAnalog modules were a thing back in the day, being in competition to various R2R ladder chips from BB. Those who heard the Moth DAC at the California meets years ago may be familiar with its core sound. I know a few others have purchased DACs with UltraAnalog modules. Some big names in pro gear back in the day used them too. I believe UltraAnalog glued together some off the shelf chipses to get "20-bit" performance. The module output voltage.