So, my guess is that ’bright’ is based on one’s individual hearing. It helps explain why we like certain speakers - or components. Of course, other factors need to be taken into account: the room, the cleanliness of the power, the synergy of the components with each other and with the cabling.
In other words, everything matters. LOL.
Agreed
Numerous variables and circumstances account for different listening experiences reported with audio products.
Charles