The owner of this site has created a business model. He wants to be an influencer. Maybe more money should be spent initially. Instead of testing one used speaker, how about more than one from a different source?
I am not here to solve manufacturer's problem. You seem to be. The solution to that is simple: as I mentioned, if a manufacturer thinks products they have sold to consumers that are being used without thinking they are broken, indeed are broken, then they should send me a new one to test. If they refuse to do so despite the little cost of shipping, then you, as a consumer, you should assume the measurements are fine. To think otherwise is to be manufacturer's PR person, not an advocate of consumers.
As to my business model, it is one that has worked hugely well in reviewing nearly 300 electronic products. They are a mix of new, and used as speakers are. What you want to think about is the business model of a manufacturer who is likely used to giving free loaner gear to "reviewers" in exchange for positive outcomes. What I do disrupts that since I don't source my gear from manufacturers that way.
Now, good manufacturers do send me gear and they are the ones we cherish around here because they are not afraid of independent verification of their products.
Roger Cicala, of lensrentals.com, is widely respected in the photo community. When he decides to test a lens he purchases up to ten lenses so he can rule out copy variation prior to posting his results. No one criticizes his methodology. Ascend's Dave Fabricant has pointed numerous flaws with amirm's methodology and ratings process.
Wrong. He made zero criticism of the measurement system capability:
This is the heart of my review: measurements created by Klippel NFS. The system is fully automated and not at the whim of an operator cooking the results for one speaker versus another.
He argues about preference scores. I actually don't compute them, nor usually post them. They are based on very solid research as noted in his own thread and his criticism without data is worth nothing. Have him bring those "ex-Harman" engineers and tell us what they think about it. Don't give us hearsay information made to favor his point of view.