Atmos - MA-c265-idc transformers age of extinction - rattling

Discussion in 'Home Cinema Speakers' started by antl, Aug 3, 2019.

  1. antl

    antl
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    I have 2x monitor audio c265-idc speakers, used as height speakers with a denon 6300.

    The intro of transformers- age of extinction (with Dolby atmos), specifically when the spaceship flies over outputs a horrible rattling/blown noise.
    The sound that makes your stomach sink, like it's blown.
    I tested both individually, the right height seems louder, but both speakers do the same. I've never experienced this before and still don't on any other film, music etc - except when I first purchased, one of the speakers rattled on the blade runner scene at 30 minutes and that really was blown.

    Was bugging me and wondered if anyone with similar spec experiences something similar?

    Thanks
     
  2. DodgeTheViper

    DodgeTheViper
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    I’ve owned these in the past and since swapped them for something else but I didn’t encounter this issue.

    Are they totally free from any obstruction above and around the basket, even making sure that the cable isn't coming into contact anywhere ? And are they a comfortable snug fit and flush to the ceiling ?
     
    Last edited: Aug 3, 2019
  3. antl

    antl
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    After some troubleshooting, it appears it must just be the sound from the jets on the ship! -
    30 seconds in, there is a ship that comes from the right, the output from that right height channel sounds exactly like a busted, rattling speaker. I tested both my heights off that channel, as well as one of my floor standers and even they all make a rattling type noise, the height speakers extenuate it slightly more and you need the gain quite loud to notice (68-70)

    Interestingly the ships that fly on the left , via the left channel, don't seem to be as loud and a bit less troublesome to worrisome ears
    Have a listen and see what you think.

    Which speakers did you replace them with out of interest?
    If i was to do it all again I would have bought some with sealed backs as still not happy with the sound transfer upstairs, even with homemade sealed backboxes on them, but the speakers are great.
     
  4. DodgeTheViper

    DodgeTheViper
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    I can't test that movie, sorry.
     
  5. mjbtin

    mjbtin
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    Are you using a sub?
    Have you tried raising the crossover freq on the 265 ?

    Martin
     
  6. antl

    antl
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    Yes, got a subwoofer. I haven't reconfigured audyssey subce I mislaid the microphone somewhere in the loft. The heights are set to 40hz at the moment, the noise in question will only go away If I raise them to 200+
    Incidentally, not sure what frequency the heights should be set to?

    The noise I am talking about, the thrusters of the ship pass overhead on the right handside:
    - 40hz - go to 13 seconds.
    - heights set to 200hz ( cannot hear)
     
  7. Pawson6844

    Pawson6844
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    I have the 380 models and set mine to 80hz
     
  8. antl

    antl
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    Thanks, I spoke to monitor audio and they said 80hz is best to match the THX standard.
    Concerning noise from the thrusters though, I'll skip that part in the future :)
     
  9. Gasp3621

    Gasp3621
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    Nothing stops you trying higher settings especially if you listen very loud and feel they sound too strained. Lot of people using similar size ceiling speakers around 120-150hz, but which ever sounds best to your ears.

    If you have kept the C265IDCs at 40hz god knows how long, please also re-check your other speakers crossover settings and bump them up if set as low.
     
  10. DodgeTheViper

    DodgeTheViper
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    Its certainly worth setting Atmos to circa 120Hz and giving it a listen to see/hear what you think and if it makes a difference. They may then create a slightly different sound to the base speakers, which could be preferable for those overhead effects.
     

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