"Bright" is definitely subjective. However, I have noticed in my own listening sessions that there is a lot of "bright" gear out there in the audio component world. I think that in their efforts to expand detail and soundstage, many audio manufacturers are now making products that sound brighter than their older models. This isn't a new problem, and it has affected the recording industry as well. I'm no expert, but I would say that this trend started with the advent of digital music. I notice it particularly with digital remasters of older recordings. I personally prefer the older analog recordings on vinyl to just about any other source.
That being said, I do agree with some of the others who have indicated that B&W make some bright speakers. They'll dazzle you with detail, but their top-end glare can drive you nuts after a while. The one B&W speaker I have enjoyed in all of it's different iterations is the 805. I feel that this is now - and always has been - the most balanced and enjoyable speaker they've ever made. Just an opinion.
In my main system I have a tube preamp running a pair of class A monobloc amps. I am using a pair of monitor speakers from England. When I finally got this system set up, I found that I could truly enjoy all of my music. Nothing seemed too "bright" anymore. Granted, you can't fix a crappy recording, even with the best audio gear. But most of what I listen to is vinyl and streaming, and it all sounds terrific.
Building a system takes time and money. This can be a very expensive hobby. As many of the others in this forum have suggested, I recommend auditioning different speakers. I agree with the "soft dome" tweeter recommendation (Dynaudio is great), and I think the ring radiators (Aerial, Sonus faber) are really good, too. Also, I strongly recommend giving GoldenEar a listen. I have a pair of these hooked up to a tube integrated amp in a separate system, and they are amazing!
Anyway, have fun and be patient. It took me five years and a lot of buying/selling gear before I got it right...for me. 😎