I enjoyed reading your recent review of the Spectral system (and re-read for perspective your initial interview of RF/KJ in FI magazine, way back in 1998). Spectral seems quite happy with a press update every ten years. I've got a few questions which I hope can be clarified.
1. Spectral seems to recommend (unofficially) single-ended cables to connect their electronics (I'm refering here to their "non-universal" products), while still supplying a couple of XLR's on the preamp and amps. What is their logic or rationale in this respect, within their overall paradigm for full system integration ?
Why bother with XLR's, then ? In his "unauthorized" review of the DMA-360s ten years ago, HP remarked that balanced connections were his clear preference, and the man heard what he heard.
2. The SDR-4000 looks like their legacy CD player, like the Linn CD-12 was in its time (best possible transcription of Red Book CDs). One thing that I find confusing is the scarcity of digital I/O on this reference/signature unit.
With PC audio/servers and HD tracks gaining momentum, why not provide more I/O options on the SDR-4000 ? Do you know more about the design objectives that would account for the limited I/O options ?
3. And to finish on the issue of a full Spectral system synergy, what are the reference speakers ? Electrostatics ? (there used to be a Quad version modified by Entec way back) . Avalon Eidolons ? Wilsons ? Politics aside, I assume the Spectral team must have their reference speaker, one that best expresses downstream the fusion of all their design goals ?