Question Subwoofer Crossover Confusion

Discussion in 'Home Cinema Speakers' started by DArthur, May 16, 2018.


    1. DArthur

      DArthur
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      Hi Guys,

      New to avfurums.

      I have set up my new Atmos surround sound and i am very impressed with the sound. But i feel i am not getting the best out of my single subwoofer.

      I have been looking into the crossover and would like some advice at what to set it at.

      I have a Wharfdale 150w Sub. 35 – 110Hz and crossover between 35 and 85 Hz. My main front speakers are Wharfdale Floorstanding Diamonds 100W and 55Hz - 24kHz.

      On my Atmos AV receiver i have set all the speakers to small and i have dissabled the build in AV crossover fuction so to let my sub do it. (Would of thought this best way)

      Any advise on what crossover frequency to use would much be appreciated.

      On a side note, once i have found the correct crossover point should i re do the AV calibration?

      Thanks
       
    2. gibbsy

      gibbsy
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      The EQ system, you don't say what amp you have, sets the crossover. You should never set a crossover below what the system recommends. The sub itself should have it's crossover set to it's highest on the dial on the sub, volume control to around 11 o'clock, then re-run the EQ. The receiver always sets the crossovers.
       
    3. DArthur

      DArthur
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      Ah OK. Yes during the set up of my SONY STR-DN1080. It said put the crossover to MAX, but was unsure if i needed to change this after the calibration. So i should leave this at MAX redo the calibration and also leave the AV crossover manual function to off? It also listed all my speakers to Large which reading many forums is best practice to set to Small.

       
    4. gibbsy

      gibbsy
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      Your sub's crossover should be set at and remain at it's highest which is usually 120hz. After calibration set all speakers to small. If the EQ is setting them to large then I may assume that you are able to set the front three to 80hz as they probably roll off at around 40-60hz. I'm not familiar with the Sony's EQ system but the Audyssey in my Denon set all my fronts to 40hz and large so all the alterations were done post calibration. 80hz is recognised as the best crossover for movies, with a sub at it's maximum.
       
    5. DArthur

      DArthur
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      Thanks for advice gibbsy, i will chuck the Mrs out of the front room and redo my CAL. : -)
       
    6. meagabyte

      meagabyte
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      I second what Gibs has said. Pre-calibration the sub should be set to:
      Volume - about half way
      Phase - 0
      LPF (crossover) - LFE ( my sub has 50-200 on the crossover dial but turning it all the way to the right sets it to LFE meaning it gets its settings from the amp)
      After calibration I set all my speakers to small but have set my Front Left and Right to 60Hz, centre is at 80 and I think rears are 80 as well.
      The reason I set my fonts a little lower is because my Sub is ported and rather big so I was missing some of the punchy base at low volume levels. My fronts are also Wharfdale but the Xarus5000s
       
    7. dante01

      dante01
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    8. UMAR 3:16

      UMAR 3:16
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      Why have I always thought that the sub crossover should be set to where you want the sub to kick in and the speakers to roll off? So all my speakers are set to 80hz and the sub too.
       
    9. dante01

      dante01
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      Maybe you were unaware that the AV receiver would be doing all the filtering required and that the sub's filtering is only required in setups where there's no prior bass management in effect? It is a common misconception.

      For a start, the sub handles the LFE channel present in multichannel formats so it you set the sub's crossover to 80Hz then you'd be potentially discarding the remaining frequencies associated with the 120Hz ceiling set for Dolby's LFE channel. The LFE channel isn't subject to the AV receiver's crossover filters.
       
      Last edited: May 18, 2018
    10. UMAR 3:16

      UMAR 3:16
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      How stupid do I feel this very second...
       
    11. dante01

      dante01
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      Don't. AS I said, it is a common mistake to make and you are not alone :)
       
    12. UMAR 3:16

      UMAR 3:16
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      Ok thanks. So does I need to turn up the crossover on the sub and run the recalibration on my amp again or can i simply just turn up the crossover?
       
    13. dante01

      dante01
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      I'd suggest rerunning the calibration after setting the sub's crossover to its highest setting or its LFE option. The EQ correction the receiver may be applying to frequencies above where you set the sub's crossover are probably currently incorrect.
       
    14. UMAR 3:16

      UMAR 3:16
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      What do you mean by LFE option? Which option?
       
    15. dante01

      dante01
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      Some, but not all subs include an LFE setting that bypasses the sub's own filter.
       
    16. UMAR 3:16

      UMAR 3:16
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      Thanks again... but I shouldn’t adjust the amps LFE setting manually. The calibration should do that correct?
       
    17. dante01

      dante01
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      If the receiver has an LPF of LFE filter then I'd suggest this be left set to 120Hz. Note that an LPF of LFE is a seperate filter to the crossover filters and not all receivers include it. It is a Low Pass Filter that only applies to the Low Frequency Effects channel.

      You can manually adjust the speaker sizes and associated speaker crossovers onboard the AV receiver post calibration, but I'd suggest not setting the crossovers lower than the roll off detected by the calibration.

      You shouldn't alter the settings on the sub itself after the calibration, not without then rerunning the calibration.
       
      Last edited: May 18, 2018

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