I don't think I contradicted myself. But if I did just to clarify.... What I'm saying is I know Cyrus is a detailed sound (as have been all the way through the range) and so is brands like musical fidelity. But Cyrus is also very dynamic and fast. But naim and arcam are warmer tonally than Cyrus. That's probably why people go with these types of brands, because a lot of tastes in hi fi are in a warm sounding set up that people get used to. My impression is that usually this is the type or sound of budget stuff as well (which I've owned in the past too, lots of it) mainly because the bass is wollier. But it can be wRmer high end stuff too. But the point is it's all about system matching. If you've got a speaker which isn't quite as tight on bass as you'd like it, and is tuned for a bassy sound, as indicated, the last thing you'd want to do is pair it with an amp which has a relatively tonally warmer sound, or isn't maybe as dynamic, as I'd doubt it would bring the best out of those monitor audios.
I'd agree a speaker can sound bad if not matched with correct amp, but I'd beg to differ if you think Cyrus is uninvolving per see as if you listen to the signature stuff it's very good indeed. So is an 8dac.
But it depends on the speaker too and I'd agree with you on matching Cyrus on the kef r series (if something like a 6dac or 8 dac) and possibly harbeth, but harbeth can be quite detailed and very natural already so I'd say it's not a great match. But kef r series not fantastic unto themselves. But with pmc's like mine Cyrus sig stuff works well as pmc's have loads of bass with the transmission line and Cyrus sound compliments them. On spendor some speakers can be a tad bright e.g. A6R with Cyrus, but not D7 which is a warmer spendor. But anyway back to the subject.
So if it's agreed the ma's need tightening up in bass, a bit more dynamic prowess, and they aren't going to be huge detail retrievers at the price so extra detail will help, whilst still being quite wArm speakers already (Somebody commented they have added bass in freq response ) my preference would not be the arcam a19 but a Cyrus one. Or a used Cyrus 8dac or something like a rega elex r
I heard these ma speakers in richer sounds or very similar with a Cyrus lyric and they were very good indeed, but the lyric is out of price. But the lyric and Cyrus one are more than a match, and I think the Cyrus one would be better with its amplification than the lyric all in one (less amp for your cash). The one is class d and has impedance matching and I can see that for the load of these speakers it will be more powerful than the arcam, so I'd expect it to handle the dynamics of music probably better. Being a Cyrus too. I had arcam alpha 7 amps and CD player and not nearly as good on dynamics as comparable current price cyrus stuff.
before making any used judgements I'd say to the op, if you want to go that way, take your speakers to a richer sounds and listen to arcam and Cyrus and others etc , then buy a used unit. It shouldn't matter you maybe aren't intending to buy because you are through their doors and you could buy new, depending on the price. If you don't then buy used.
Once you've got the house sound in mind, you can buy the amp brand to suit. But advice no substitute for listening.
Another one to try is the rega elex r being dynamic and rhythmical according to what hi fi, so I'd try that too. Also good power.
A systems majic isn't just in the mid range, it's all over. But I agree it's important. So the qualities of things like detail to make music real and layers in the music stand out, also detail for how much timbre music has, then dynamics (both bass and otherwise) to make the sound get to the note quickly and come down again, also volume shifts within the music track. You could also bring in timing or speed here or call it the same as dynamics. Then there is things like soundstage and stereo imaging. How big an image does the amp and speaker combo provide (soundstage), how does the amp handle shifts (imaging - a good test is money by pink Floyd when the coins and jangling till etc at the start move quickly from one speaker to the other). I'd add midrange prowess in and also another one is the realism of the bass and it's depth. All of these things can be amp dependent.