You are here

Log in or register to post comments
amblin
amblin's picture
Offline
Last seen: 3 years 1 month ago
Joined: May 12 2011 - 11:26am
Abnormal noise in the mid range unit?

  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?

  

amblin
amblin's picture
Offline
Last seen: 3 years 1 month ago
Joined: May 12 2011 - 11:26am
by the way, anyone ever heard

by the way, anyone ever heard the sound of  native courting flute?  Well.. the noise was just like the 'vibrating‘ sound of that thing.....

.. listening so close to the speaker is giving me a headache, guess the big magnets inside is magnitizing my brain...arrrgh

RGibran
RGibran's picture
Offline
Last seen: 1 year 10 months ago
Joined: Oct 11 2005 - 5:50pm
Could be internal

Things happen during shipping and moving.  I moved to a new location and one speaker devoloped a similiar vibrating noise.   Turned out an internal wire had moved up against the speaker.  If opening the cabinet won't voidd the warranty I'd have a look.  Could be something simple.

 

RG

amblin
amblin's picture
Offline
Last seen: 3 years 1 month ago
Joined: May 12 2011 - 11:26am
thanks for the input RG i

thanks for the input RG

i really hope it's that simple... Well indeed they crossed many oceans  before reaching my home .. But i thought the brits had this well considered... it's making me nervous just by thinking about opening the cabinet, i'll call my dealer and ask them to take a look.  

j_j
j_j's picture
Offline
Last seen: 2 years 2 months ago
Joined: Mar 13 2009 - 4:22pm
Sounds like you want to get them serviced

If it's consistant across content that has midrange content, etc, then you really should get it fixed sooner than later. It could be a voice coil issue, or something touching the back of the cone, or a particle inside the gap rubbing on the voice coil, or a few other things, but the one thing I can say for sure is that it shouldn't be there.

  • X
    Enter your Stereophile.com username.
    Enter the password that accompanies your username.
    Loading