I guess I would look at the problem your seem to be trying to solve in a different way.
You have $4000 to spend, OK. What is the size of the room, what electronics to you have to power them, what are your musical tastes all must be considered first.
Then you can look at what you can get new for 4k or used for 4k that meet those needs and make a decision. Certainly there is always some risk buying previously owned but the site has a thriving clientele buying and selling "used" gear.
Also new speakers are easier to audition but even if looking at particular brands used, you may be able to listen to the general sound/voicing from that brand to help.
If I were you I'd take that approach, put in the time and effort and not expect a silver bullet answer
You have $4000 to spend, OK. What is the size of the room, what electronics to you have to power them, what are your musical tastes all must be considered first.
Then you can look at what you can get new for 4k or used for 4k that meet those needs and make a decision. Certainly there is always some risk buying previously owned but the site has a thriving clientele buying and selling "used" gear.
Also new speakers are easier to audition but even if looking at particular brands used, you may be able to listen to the general sound/voicing from that brand to help.
If I were you I'd take that approach, put in the time and effort and not expect a silver bullet answer