Would like to listen to the Audiolab, one thing they do very well is DAC implementation, they make ESS chips sound amazing, people don't understand that having the latest DAC chip means nothing, it's 90% down to implementation which significantly impacts the final audio quality, I had the classic M-DAC back in the day which was a very influential DAC, so much circuitry surrounding a simple chip.
It's the quality of the output stage, but it's also keeping the RFI low, as this effects analogue stage and also clocks causing jitter.. The new Naim D50 DAC has separate digital and analogue sections with their own PSU, my Yamaha SACD players do the same. Google inside picture of Yamaha cd-s2100/3000. The Naim D50 has built in passive AC filtering also.