The problem I have with expensive processors is that, unlike preamps, they tend to become obsolete as new processing technology is developed. So I use an Oppo 105 for processing, and pass through its front LR stereo to the preamp. Surround channels can be taking directly to the amps. If your preamp does not have a by-pass mode, you can mark the point at the volume control where it achieves unity gain using an SPL meter.
The single-ended output of the Oppo is as good as its balanced output, leaving the balanced inputs of the AR preamp available for the Esoteric and Accuphase. I think DTS HD MA is worth having.
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The single-ended output of the Oppo is as good as its balanced output, leaving the balanced inputs of the AR preamp available for the Esoteric and Accuphase. I think DTS HD MA is worth having.
db