I don't usually listen to 2ch music in my dedicated HT room as I do have a separate 2ch setup and system in a separate 2ch listening room.
So I'm using my HT processor strictly for surround sound movies (4K UHD bluray & Blu-ray Disc playbacks) and some bluray concert bluray and 4K UHD & bluray musical films. But I have tried the SSP 800 for stereo music playbacks before and it performed very well for an AV preamp processor. Yes, the Lyngdorf MP-50 does not have any analog inputs. I recently tried the MP-50 stereo performance for music using its built-in DAC of course. I hate to say that the Classe SSP 800 still sounded better. Even when used for surround movies the SSP 800 is still superior in my setup and system. The SSP 800 has more body and volume and just sounded right and had the right amount of bites. In my very own setup / system the Lyngdorf MP-50 sounded lean, thin, brighter and somewhat fatiguing at times and lacking body and volume in comparison to the SSP 800. But with the Room Perfect properly calibrated the clarity, details and resolution on the Lyngdorf is excellent when used for surround sound movies, and so is the SSP 800. But IMO the Lyngdorf slightly edges out the SSP 800 in clarity and resolution with the Room Perfect properly set up and calibrated but it's bright kinda thin lean sounding in comparison to the SSP 800, at least in my very own setup and system. Overall the SSP 800 is more balanced throughout the spectrum, smoother and more refined than the Lyngdorf. But the Room Perfect in the Lyngdorf is pretty good and effective be it's easy to navigate and use and will make it easier for end users to re-calibrate when you change speakers or speaker placements or change power amps, etc.
Frankly I kinda regreted selling my SSP 800 and I missed its excellent sound quality. The main reason I got rid of the SSP 800 was because I wanted Dolby Atmos and DTS-X. That's why I ended up with the Lyngdorf. And Dolby Atmos & DTS-X will give you different surround sound experiences than regular surround sound experiences (DTS HD MA, Dolby True-HD, Dolby Digital, DTS).
Now I'm seriously thinking to sell my Lyngdorf and get either the Audio Control Mastro 9 or the Datasat RS20i or the Trinnov Altitude 16 or 18. I've heard great things about the Audio Control Maestro 9 being superior sonically to the Lyngdorf MP-50 and both the Audio Control Maestro 9 and the MP-50 are the same price. And the Audio Control Maestro 9 also decodes Dolby Atmos, DTS-X & Auro 3D and supports 4K pass through, hdcp 2.2, HDR & Dolby Vision on the video side.
I was told by a reliable source that Classe is going to release the replacement for the SSP 800 possibly in 2020 and it will be bad ass but it will be very expensive possibly around $16k to $20k. Don't know what it's going to be called yet.
It will probably be the best of the best. We shall see. When it happens I will most likely upgrade again.
So btw22 I'm sure the DAC in your Aurender A10 is way superior to that of the Lyngdorf MP-50 of the SSP 800. But since the MP-50 does not have analog inputs so your current configuration with the SSP 800 in bypassed mode using the DAC in your A10 going analog into the SSP 800 will be superior sounding in comparison to the A10 going digital into the MP-50.
Keep your SSP 800 for now if you don't need Dolby Atmos, DTS-X or 4K pass through & HDR, etc.