I have always liked the lux. It has good current and drive and organic. Apogees need both current and power to wake them up, so I think the Luxman m900u will be better.
I can't say as standalone demo because I prefer Henk's duetta (which I heard with biamped plinius though in a much larger and better room) and the US duetta (which I actually hard with push pull, the TRL). But since you already preferred Justin's you will like it much better with the Luxman, as I thought it is much better than his previous amps.
Imo he still needs to change his pre which is weak link from decades ago.
Apogees just need lots of drive and power. It is because of this lack of headroom that you have problems playing them at low volumes and have to play them ear splitting levels
Ked I truly don't think you realise how your posts read to people with some understanding of audio engineering. You think you are an Apogee expert yet actually you haven't got much of a clue technically. You also have not heard a lot of the options I have tried, and your claim you have been recommending Luxman to me for the last three years is a lie. So far all I have ever known about it is a WhatsApp message from 2 years ago about one sentence long.
Of the three solid state amps in my house at the moment, the Luxman is the least powerful. Yet it is the best.
Also, at low volume, you have the most headroom, so where does the logic that I listen so loud because of lack of headroom come from? Answer it doesn't. It's an idiotic claim.
FYI low volume performance is very good. And usually when the wife is in bed I listen to them at low volume for long periods of time. And it is you that sits there with the volume cranked up listening to classical music. I'm not saying I don't usually demo them loud, I do, but they are also very good at lower volume. Much better than any Martin Logan I have owned, for instance
I also find your continued insistence that Henk's Duettas are somehow miraculously better to be a bit of a joke. By your own admission, Jon's are better made than the ones you have seen made by Henk. Just what is this mystical property you claim Henk's Duettas have that mine don't? Just like Jon, Henk is capable of making an average Duetta or a really seriously good one, in my opinion. I wonder if you have ever seen Henk's best effort..
Also what's this about my preamp being from decades ago? It isn't. I preferred it to an EAR 868PL, for instance, by a margin. It is just more lively and engaging.
I also never tried my old Air Tight ATM2 on Apogees, Just the Air Tight passive pre. The Ayon's were not silly and they were yours anyway. They were fine on the four Ohm taps in pentode mode. They just shutdown in triode mode on the four or eight Ohm taps.