Ignore the people saying a avr wth room correction will sound better than a analogue stereo that is basically a switch and pre amp.
My stereo analogue pre amp outclasses the AV pre by a mile, it simply sounds better, wider and higher soundstage
Considering his much you spent a system just get a proper one they're about £20.
I've got a radio shack...it's a one time purchase I've had it 20 years. Useful for manual level calibration as I found auto matic one a few dB out
That's why I think av pre should be audio only, like older ones you used coaxial from dvd to av pre, then s-video or component from dvd to TV...if you upgrade tv to component what the av pre has or hasn't got for video doesn't make a difference
The other issue is older spec HDMI has planned obselence, second hand value is zilch.
I bet a £10,000 av pre that is hdmi 1.4 or hdmi 2.0 has lost a considerable amount of value, the gap between 2.0 and 2.1 is mostly for 120hz and latest gen consoles. Still that's enough to put fair number of...
Mixing multi channel down to stereo on my av pre works fine, but I don't have a Denon.
I would recommend having a good quality center speaker, ideally matching from the same range, or if the one from the same range is sucky, go up the range to a better one
Are these (and noticed a few other makes) a pc, like trinnov has pc backplate.
Presume micro ATX or smaller?
Would like to see internal photos of these "pc av pre" to see what they're done to standard pc motherboard