That's a good point and question that deserves a proper answer. I have independent measurements of my speakers that say they're excellently neutral (which has always been my taste, a convenient coincidence) not only for their price, but also in absolute terms. And there's no big compromise or crossover trickery either: these Heco Aurora 700 aren't super insensitive, on the contrary. Manufacturer says 92dB/W/m, measurements say 90-91. Slightly above average.
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Traditional German tuning: "neutral with good bass"
That's an in-room measurement by a generally respected review website (ifidelity.net) with good methodology. These were 600 the pair with a good deal, usual price 700-800, RRP 1000-1200. Certainly counts as "cheap" for a 3-way floorstander. There are plenty speakers for triple and quadruple the price from established makers that don't reach this level.
Properly controlled blind ABX tests of those vs other speakers? None that I'm aware of. Not like that's a common thing either - or at all. I'd like that just as much as the next person on here, but it's just not done generally. All I know of is these measurements and a few more, and numerous subjective reviews, all of which say these are surprisingly, really good. Which I can subjectively confirm. The objective measurements back it up, including those saying the dispersion is VERY wide and with it the subjective stereo image.
You can surely buy worse, sometimes by a lot, for triple the money.
They are driven by the Audiophonics implementation of the NC252MP, and an SMSL DO100, both of which were tested on here and found excellent, which is why I bought them. All in all a 1200 moneys stereo, with which I couldn't be happier. You can easily spend 3000 or 5000 and get a worse sound overall, especially if you're a bit of a fool and waste money on cables and whatnot.
Which is exactly what the people do I mentioned in my post above. Am I somewhat arrogant looking down on them? Sure. But they deserve it, because they refuse to learn better - which I did, not the least thanks to ASR. I may be morally questionable or even wrong on this matter, I freely admit that. But objectively? No. I say, if you spend triple or quadruple the money for an objectively worse outcome, you're doing it wrong and should've done more research. I'll stand by that.