noise in the upper registers

la gran siete

Distinguished Member
It appears during loud passages of play inth uppere frquency extrems . A sort of rattling noise. Ive noticed it particulalrly in some classical music.Just wondered whether anyone knows what might be causing it?:confused: For the most part its not there but when there is a sudden surge into the upper registers it becomes obvious( is this what is called transients). I changed my amp which was rather underpowered 15 amp class t to a Auidiolab 8000 a but its still evident

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