I don't mean to be hypothetical.
What I experience is that a low cost speaker that is well designed sounds in tonality much like its state of the art brothers. Certainly when using with an avr and subwoofer.
But ymmv, I accept that.
This has been my experience for the past 8 years ( Thanks ASR). I was an ardent subjectivist audiophile and High End Audio fanatic for almost 40 years ..
My current system , which by the way, is the best I have had in all those years , cost if you just isolate the 2-channel audio section, less than $2500. That would have been the cost of what I considered a "decent" speaker cable then.
Repeating it JBL LSR308 for mains in 2-channel mode
2 Subs
Denon AVR-X3400H
miniDSP 2x4 HD
With Audyssey MultEQ-X + REW + MSO
This combo is the best system I have had in my 50+ year s of being an audiophile and it measured well too: plus or minus 2 dB, Flat 18 to 20,000 Hz. Capable of 110 dB (measured and shared here on ASR) in HT mode at the Main Listening Position
Recently about 6 months ago, I discovered
@OCA Scripts. I use currently his latest, the Acoustix. The niniDSP was removed, Nor Do Iuse MultEQ-X anymore. Just the AVR and the speakers + 2 Subs. These scripts deserve to be better known by the audiophile community: Game changer, almost transformational.
I am pleased , happy. Wondering how much should I spend on speakers to enjoy a substantial improvement. Any speakers better than the LSR308 cost multiple of its price. Would it be Kef R series? Q Series, Revel ? F206, 208, 228 Be or BMR Philharmonic Tower or Genelec? Or Neuman? AsciLab? What else.. Perhaps a jump in Revel Salon 2 or Kef Blade 2? Salon 2 is definitely in my mind just because you can find some bargains here and there, with HEA audiophiles constantly dumping gear and the Revel Salon 2 is after all 18 years removed, so for many HEA audiophiles a vintage product

I also think about moving to Kef R11 non Meta because they are on eBay, sometimes, at great prices ... so ...On the fence but not worried ...
I became about 5 years ago, convinced that that an AVR must be the heart of any Audio system, be it 2-ch or multi channel.Don't care anymore about separates, although for some speakers, external more powerful amplifers could be warranted. On that, I think Denon/Marantz represent the audiophile best bet. They seem to be the only AVR to offer Audyssey (Better than most people realize)
and Dirac (I have no experience with it but by many accounts it is good , especially the ART). The baseline in my book for AVRs is the Denon X-3800 , it offers the higher version of Audyssey, can run all Dirac varieties including the ART, has pre-out and 4 (independent) subwoofer outputs...I believe it, now has Auro-upmixing.
For those audiophiles with the means and the will, there remains the superlative Trinnov and Storm Audio Pre/Proand the Monoprice HT-1 an outlier with its own DSP feature set. I have heard good things about it but have no experience with it.
Anyway my quest for endgame would go through a Denon or Marantz AVR, not caring about their Pre/Pro/AVP, which are usualyl their TOL AVR with amps removed ... and are more expensive to boot... for basically the same set of features