My CDSii sounds great in a tube system. I have heard the 5 series sounds best with Naim gear but the reference series like CDX, CDS, etc, is more flexible. I have no experience with the 5 series.
I believe the Naim CDP's are the sweet-spot in the Naim product line. I have a CD5X with HICAP2 and it usually outperforms other CDP's at audio meets. It has bested the Talk Thunder 3.1b, Cary 306, and the Opera Droplet 5.0. It lost to Meitner, dcs stack and Dodson (with transport).
Thanks for your feeback guys. I've heard many times that Naim cdps work at their best with special naim interconnect,otherwise they loose something of their true potential.
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