I’m glad you brought up Audio Research DACs. I own an Audio Research Reference CD9SE DAC. It is simply phenomenal, musical, and detailed. It made a huge difference (positive) in my system.
My dealer lent me a Berkeley Reference Alpha 3 DAC to try and buy if I wanted ($22K). I was fully prepared to shell out the additional $5K for this very well respected DAC.
I was very surprised when there was no obvious difference. I really had to listen carefully and for long periods of time to detect differences. There was a difference in my system… very very small… the ARC was very slightly more musical and warm in the midrange and upper bass, and the Berkeley had ever so slightly more detail. But the difference was very small. To my partner (she has better hearing… but with little interest of knowledge in sound) the ARC sounded better. I also preferred the ARC sound.
Wow, that was a first… I liked the less expensive component. But then the rest of my system is Audio Research… synergy perhaps.
But definitely look a ARC.