The only way you will know the sound quality of a particular speaker is to change only the speaker with the same electronics.
I am not a Harbeth fan, I prefer ATC to Harbeth, but that is not the point, your mistake is thinking that you have to shop used.
We and other area dealers have demo products that you can purchase for less, and in that way you can still here a good representative sampling of products which is impossible to purchase that way on the used market.
Your best resource is to find a good dealer and demo a bunch of speakers in your price range that both you and your wife like.
You also need to be cognizant of the electronics can change the sound therefore you should either bring your own electonics
I am not a Harbeth fan, I prefer ATC to Harbeth, but that is not the point, your mistake is thinking that you have to shop used.
We and other area dealers have demo products that you can purchase for less, and in that way you can still here a good representative sampling of products which is impossible to purchase that way on the used market.
Your best resource is to find a good dealer and demo a bunch of speakers in your price range that both you and your wife like.
You also need to be cognizant of the electronics can change the sound therefore you should either bring your own electonics

