I am not an " objectivist", but in spite of some difference in sound between all dacs, the industry being mature now, the diminushing point is here very soon...
My low cost dac can be upgraded but what it gives already to me : a battery low noise working then no connection to the grid, an equalizer i need, a big files bank, and decent good dac operation if i trust my highly sensitve AKG K 340, then any real upgrade, not a marginal change in sound with a tube dac or whatever, will cost me 50 times his price at the least ...I can live with " the out of the head", clear three-D speaker like soundfield from my headphone i enjoy now without any upgrade of the basic dac payed 200 bucks ...
@mahgister +1! A DAC is essentially a sound card. That’s all! Put it in a fancy machined-from-a-solid-billet case and you can charge $50K for the same parts as the $100 KTB DAC. Nobody will be able to tell the difference from, say, the real expensive Audio Note DAC! Because Hi-End DAC’s are a good example of confirmation bias!