I managed to get an audition of a prototype of the new Naim DAC at the Bristol Hfii show, on the tenth floor, demonstrations by appointment.
The demonstration was showing the difference between HDX, Mac book, benefits of adding power supplier, and then the DAC itself.
Personally I was very impressed by the DAC. They used the digital out from the HDX to feed the DAC (The DAC was powered by the top of the range power supply)
Although the gentleman giving the demonstration (MD I think!) said before adding the DAC, it gives a different presentation to the sound, you may prefer it or not. A friend I took along with me agreed with that, saying it changed the presentation.
I personally thought the change was head and shoulders above the original sound. The addition of the DAC to my ears seemed to completely clear up the whole spectrum making it more musical as a result. This was particularly highlighted by making vocals and leading edges more clear and sharp but at the same time, making everything sound smoother and more together, more whole. Do you get the idea?
Just to highlight, I preferred the HDX, DAC, top of the range power supply V's HDX and top of the range power supply.
All good news I think, so when funds allow, it will be the Naim, Bryston and Chord Dac on the audition list.