hi all

  Long story short, so i recently invested on a new system, a pair PMC MB2i,  Bryston's BP26 pre amp and 14B SST2 power amp.

  Yesterday, while listening to some piano solo records (DG 445 517-2) , out of pure coincidence, i was sitting next to one of the speakers, and i noticed some very light, but abnormal noise in ONE of the mid range units, it's like something very small went loose inside the unit causing a resonance or vibrating against something inside. After i notice the noise, i tried swapping channels, toggled to mono output and confirmed that it's only one unit. But the strange thing was that while playing symphony , string trio, vocal or other records , the problem becomes much,much less obvious, but i could hear that it's still there...

  i checked all the connections, screws, stands and cables, they're all good ,  so i'm suspecting there's something wrong with the voice coil... But.. hmm..the speakers are brand new out of the box... 

  So.. anyone here using MB2 or MB2i speakers, or any other models in the line using similar 75mm soft dome mid range?  Is this normal? Or simply because it still needs time to run in?

  

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