What's wrong with my almost new speakers?

I agree completely with all of those whose responses have been prompted by the uninformative nature of the original post. Nevertheless, I'll describe two possible explanations that occur to me, although neither of them stands much chance of being correct considering that a zillion or so other explanations could also be hypothesized.

Theory 1: Many Focal and Harbeth speakers have considerably higher impedances in much of the treble region compared to much of the bass region. Perhaps the unnamed speakers have a flatter impedance curve. Perhaps you are still using the Rega Elicit solid state integrated amplifier you mentioned in a post 4 years ago that you were using. Or perhaps you are using some other solid state amplifier. Everything else being equal that would result in the treble region being more emphasized by the unnamed speaker than by the others, perhaps resulting in the presentation being more "irritating" (not "irratating") with many recordings. Perhaps the fact that the speakers were not broken in early in that one year period somehow compensated for that.

I know, there are a lot of "perhaps" in that theory, but given the lack of information that is inevitable.

Theory 2: The mounting screws on some of the drivers have worked loose over time, and the resulting vibrations are what is responsible. Be careful not to overtighten them, however.

Regards,
-- Al

This is ridiculous. The OP asked a simple question with admittedly too little information to provide an informed answer. Fine, ask for additional clarification but trying to show your witty side at the OP's expense is out of bounds. I note that Mc240 has been a member for a while and may be used to seeing this sort of behavior but a new member would not and would most likely be put off by this sort of behavior (and probably not return). I've seen any number of threads berating and/or bemoaning this same type of behavior among the brick and mortar establishments - how's this any different? Do you guys WANT to increase participation in this hobby or not?

Hopefully the OP will return with more information and we'll be able to help them. I can think of several possible explanations. For example, nobody's mentioned changes to the listening room. But then most have been too busy trying to be cute.

Take your speakers to a clinic...they have an STD....

We're they assembled on a Monday?

Have you been keeping the cabinet and the drivers clean?
When was the last time you cleaned both ends of the cable terminations
and the speaker posts? When was the last time you snugly tightened
the screws of the speaker cabinet?

Have you made any changes recently to the room in which you
use the speakers? New carpet or carpet removal, different furniture
and furniture placement, different wall and lighting fixtures? Do you have other unused speakers in the same room?