Interesting post from Robbob. I myself wouldn't say most DACs sound all _that_ similar, but IME they certainly start to do so when I try to define the sonic differences between them. However when I'm paying attention to a musical message, my preferences seem to appear more clearly.
Having done that, I would say there are DACs which tend to preserve the music at different levels of resolution and different price levels. For example, two musical pieces of equipment at quite different parts of the price spectrum are the Muse TDA 1543 DAC available on eBay and the discontinued Stellavox ST-2. Both of these are NOS DACs, but this is a coincidence. I've heard OS DACs I thought were musical too.
Having done that, I would say there are DACs which tend to preserve the music at different levels of resolution and different price levels. For example, two musical pieces of equipment at quite different parts of the price spectrum are the Muse TDA 1543 DAC available on eBay and the discontinued Stellavox ST-2. Both of these are NOS DACs, but this is a coincidence. I've heard OS DACs I thought were musical too.