[Blueeyedfrog]

brucek wrote:

Using analog allows a calibration file to be created that corrects the analog response to be perfectly flat. There is no cal file when using digital.

Thanks Brucek,

But I think I did create a calibration file using the digital out. From memory, to do the calibration, I fed the digital SPDIF out from the soundcard to the receiver and then used an analogue RCA tape monitor out (or similar, I don't recall exactly) to feed back into the soundcard's line input. It allowed me to generate a calibration file which I have loaded into REW. Is that not ok? The only difference in setting the output and input levels the same in REW was that I had to adjust the receiver's output since I was unable to adjust it in REW (because I wasn't using the soundcard's gain). When I get a chance I'll do the calibration check as described in the REW help file. I guess I could compare a measurement using the calibrated digital out and calibrated analogue out to see if they differ?

Cheers,
Blue