Help to understand av/sub/crossover required

Discussion in 'Subwoofers' started by readingfan, Sep 1, 2013.

  1. readingfan

    readingfan
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    Hi
    Can anyone help
    I have a onkyo 875 , a REL T3, and have just purchased 5 B&W M1 satellite
    There are a number of settings I need to understand
    The AV using audyssey mic says 80hz crossover and there is no option below 80 but increase to over 100
    But the sub has a crossover dial from 30 - 120

    I don't have a clue how to set this up
    With the new M1's also as these are full band?

    Can anyone set me a set of options that I can start at to make sense of the three perimeters

    Also in sub terms is 30 lower sound than120

    Apologies for the idiocy but if you don't aSk you don't learn

    How do these interact
     
  2. Member 639844

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    Your amp has a couple settings for the crossovers. One is for the speakers themselves, and these should be set to 80hz as a minimum, but higher if you want to allow them to go louder. The other is the LPF of LFE, and this is for the subwoofer channel during movie playback. This should be set to 120hz. If you feel your subs location is quite noticeable at this level, you can reduce down to 80hz if you want, but ideally 120hz is best and it should work fine like that. Altering the frequency settings wont make the sub louder or quiter, for that you need to increase the sub level itself, either by turning the gain dial up on the subwoofer itself, or by increasing (or lowering) the subwoofer trim level in the 875's menus.

    The best way to start is to set the subs gain about half way, keep phase at 0, and set the crossover on the sub to its highest setting, or bypass. Once you have done that, run Audyssey and it will complete setup. Once Audyssey has run, check you speaker and subwoofer crossover levels. If the speakers have been set lower than 80hz, then raise them to at least 80hz. If they have been set higher, then leave them where they are. The subwoofer may be set to 80hz, or 120, but my advice is to set the subs crossover to 120hz to begin with and see how you go from there.

    After you have completed that setup process, see how you like the sound. Many people like to increase the subwoofer level by a couple db, so if you want more bass then you can try that. If you find your speakers struggling at higher volume levels, then raising their crossover frequency setting will help them go louder while remaining clear.
     
  3. readingfan

    readingfan
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    I get my B&W on Tuesday and can't wait
    To try your advice
    My current satellites are small Sony pascals
    Very old , so I expect great things
    Thank you very much
    I assume by gain you mean level??
     
  4. Member 639844

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    Ye, the volume control on the back of the subwoofer.
     
  5. readingfan

    readingfan
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    Thank you
    Sevenoaks sound and vision have my speakers in today so I will experiment ASAP
    I will let you know how it goes
    Thank you for your generous help
     
  6. readingfan

    readingfan
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    Just collected my satellite m1's
    Only connected the front 3 and wow
    Even without audyssey
    Following your advice is a godsend
    I can't wait to get the rears going but I need
    To wait for the stands
    Sound is brilliant, pity the fool who
    Doesn't agree lol
    Thank you for the advice
    My sound has never been this good
     
  7. readingfan

    readingfan
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    Another query
    I recycled my old Yamaha amp once I bought
    The onkyo 875

    Only later I discovered I had been a muppet
    And kept the Yamaha auto setup mic
    And recycled the onkyo mic

    Does it make any difference to the set up
    Using the wrong mic
    They are different shapes for example
    And Yamaha are not audyssey
    I hope not but any thoughts?
    Thank you
     
    Last edited: Sep 7, 2013
  8. Member 639844

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    The mics will have matching pre loaded calibration files and using the wrong mic will give you wrong results. Im afraid your best trying to get a proper replacement mic. Contact Genserve and they should be able to sort you out a replacement mic, might cost you about £20 though.
     
  9. readingfan

    readingfan
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    The system still works better than before
    With the M1 and the wrong mike
    Imagine how good it will be when I get the
    Correct mic
    £20 not the end of the world considering
    The cost of the system
    Thanks again
    I will try your contact
     
  10. readingfan

    readingfan
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    I received my replacement mic
    and have now set up the system
    On your advice at the weekend
    It now sounds totally awesome
    Fast and furious 6 gave it a thorough
    Work out
    Now that's what I call sound
    Need to find master and commander
    Gladiator and dark night now to enjoy further
    Any recommendations?
     

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