OK, thanks for responses, but let's try again. Here are my "must-haves" and "nice-to-haves" (see below). A streamer-only with volume control doesn't do it. The Lumin has that. Nor do streamer-only boxes typically have digital inputs for external devices (though doubtless there are some exceptions). I need a DAC/preamp not a streamer/DAC. If anybody can make specific recommendations on specific products it would be great. So far only the SRT really fits the bill, which mike_in_nc also endorsed. It seems like a much more upmarket product than the C658. Thanks and cheers,
Digital inputs Balanced Volume Room BlueOS
Model AES/EBU Coax Output Control* Correction
(must) (must) (must) (must) (nice) (nice)
NAD C658 N Y (2) Y Y Dirac Y
NAD M12 Y Y (2) Y Y N optional
Anthem SRT Y Y (2) Y Y ARC N Preamp