For me, the diminishing returns curve flattens to the point that it becomes effectively no returns above about $800-$1000/pr (MSRP). My Boston VR2s and my Def Tech BP10bs both cost in that range and are both excellent, as are many others in that price category. The more expensive speakers I have heard (including some a lot more expensive) don't impress me as enough better to justify the price, while those significantly less expensive always seem lacking in at least some areas.
Strange. I found
easily detectable improvements from 1k to 2k to 3k to 4k to 5k to 6k to 7k to 8k to 9k to 10k to 11k.
Examples, I A/B tested some Quad 22Ls, which made the TAS best of '06 list, and so I wanted to see if a "ravely reviewed/bang for the buck" type actually sounded better compared to a doubly priced B&W 703s. Just on the difference in detail
alone is just pure night and day. From that same brand, the jump of, say, $1,500 to the 804s gave
much, much superior bass fidelity, better detail in general, and a much more even
timbral response throughout the range. Solo piano is a good test for that I find, since no other common instrument is nearly as timbrally even throughout such a large range. I could go on, whether Focal, Martin Logan, Dynaudio, etc. I should say that I have particular opinions regarding the strengths of different makers. For instance, I find that with Martin Logan, it is with their very best stuff that they actually hit the sweet spot. Otoh, some companies like PSB do not have enough time or experience to do their very best quite right. Although the Platinums (7k msrp? or something) are so good in so many ways, the port overhang is just a shame in my book, and ruins the otherwise fantastic speaker. I think their sweet spot is the Image line.
Easily discernable. I truly do think diminishing returns is a highly over-rated idea in audio. Its so over-blown imo, subjective as it may be. Then again, some people just don't hear very well, or perhaps listen to compressed pop that doesn't have much need for better stuff.
Though I have listened to two pairs of speakers at the 90k range, I didn't put them through the ringer because they were out of my price range anyways.
2) Law of diminishing returns: Really does apply to speakers. Especially as you get older and your hearing is not as acute!! Rocket RS1000 =$1000/pair. Sonus=$10,000/pair. Do they really produce 10X's better sound quality?
Regarding the Sonus 10k speakers, they must be the Cremonas? I would say yes, they produce a sound that is 10x better than almost any 1k speaker out there. I haven't heard the Rockets, but have heard numerous speakers in the 1k to 2k range. This stupid numbers game, blah blah blah.....(Is someone going to produce a graph for us regarding the "accuracy" of diminishing returns. Give me a break.) The Cremonas will melt you. Give them a listen. Bring your own speakers in, and do an A/B test, and post what you think. If you don't hear the worthy differences, then you are right, no need to spend more.