I think i got it! as DeanG suggested first i opened the crossover section at the back where binding posts are, but everything seemed fine there, connections were tight and stable, then i opened the front of the speaker to check the tweeter and indeed connects were loose and would move easily. I moved them into position and pressed slightly so they were tight. To test if it worked i played some drum loops in a sound editor and the highs in hi-hats and snare drum sounds were back and also in vocals i could hear sibilants again as well. Thx guys, now I can enjoy music again
cheers
