Just spent 7 hours at Cornwall's finest Naim dealer, where I've been treated to a stunning lineup of Naim and ProAc! Starting with a 4 box (max) requirement, I've listened to a NAC N272 (powered by XPSDR, then 555PS) feeding NAP 250DR then NAP 300DR. Speakers were ProAc D48s and K6. Speaker cables were Superlumina and Chord Epic Reference, interconnects were Chord Saruman and Superlumina.
Final choice for home demo: N272 (obviously!), 555PS, NAP 300DR, ProAc K6. First preference is for the Chord Epic Reference, but will try the SL as well. Interconnects will be Superlumina (Sarum nice but not nice enough to justify cost).
The grip and control provided by the 300DR was stunning. The 250DR was good, but ultimately no contest. The XPSDR made a significant difference to the 272's performance, but the 555 just took it to a higher level. The K6s are just simply stunning. I've thoroughly enjoyed my D20Rs for two years, but these really are something else - bass extension quite astounding, incredibly accurate imaging, a mid range to make angels weep (with pleasure!). Almost every track played revealed detail I had never heard before. To cap it all they are, to me, aesthetically satisfying, oozing quality - a nice bonus when added to exquisite sound.
Roll on the home demo - I could be significantly poorer, but for sound like I heard today I'd happily consider selling the furniture!!