how to properly tune EQs?

Discussion in 'OT Technology' started by Durka Durka, Nov 5, 2007.

  1. Durka Durka

    Durka Durka Guest

    this is a technical question.

    also, in your opinion, are equalizers useful or worthless?
     
  2. Ronin

    Ronin Guest

    theyre useful

    take an EQ and fire off test tones

    use a spl meter to measure the decibel level at each test tone

    eg: XXXdecibels at 200hz

    outpul level should be as flast as possible across the frequency spectrum
     
  3. Durka Durka

    Durka Durka Guest

    yeah, i was thinking that.
     
  4. joetama

    joetama New Member

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    Wow that would take forever...

    Plus, using pure sin waves can generate abnormal standing waves in the system that you normally wouldn't get. I am a fan of pulses or noise.
     
  5. XR250rdr

    XR250rdr OT Supporter

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    :werd: thats what RTA mics are for.

    and totally flat response doesn't always sound the best.
     
  6. joetama

    joetama New Member

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    Indeed...
     
  7. Ronin

    Ronin Guest

    gave a simple solution, and i agree flat response doesn't always sound the best eg: i like increases in some areas such as bass regions (60hz on a graphic EQ for example) because i like a bit extra bass as long as its clean, but eh, also depends on the system at hand, on my mine i find less cut at 60hz is preferable

    you can find good EQ information through links in my EDU
     
  8. joetama

    joetama New Member

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    Don't be getting butt hurt on me now.

    I was just saying... :wiggle::ioj:
     
  9. ssabripo

    ssabripo Banned

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    you need to do it right if you gonna do it.

    get REW (Room EQ Wizard)
    Get a Decent mic or SPL meter

    take some measurements, and then flatten out the nodes with Shelving filters.

    here is a great forum on REW and EQing in general:

    http://www.hometheatershack.com/forums/rew-forum/
     
  10. joetama

    joetama New Member

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    That REW is a pretty kick ass little program actually.

    I downloaded it just to screw around with it and I was pretty amazed by it...
     
  11. ssabripo

    ssabripo Banned

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    you will need to get into LMS or LEAP to find a better piece of software, and those are in the thousands! this thing is free :bowdown:

    sure helped me get my Subwoofer corrected:
    [​IMG]
     
  12. joetama

    joetama New Member

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    I want LEAP.... :(
     
  13. eighteen_psi

    eighteen_psi Active Member

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    Set gain throughout the system and crossovers (if applicable) to get it as flat as possible. Then time align or whatever if you do...then EQ to suit taste. I listen flat almost all the time myself. The only EQ I even have in the pipe that isn't defeated is the Q-bass on the PPI sub amp - 1-band 18dB parametric I use to boost older recordings' bottom at lower volumes (ala loudness) if need be. Everything else I leave flat.
     
  14. tjamz

    tjamz New Member

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    Actually, they very seldom even sound good.
     
  15. ssabripo

    ssabripo Banned

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    thanks for that bit of captainObvious.txt info there, my avless n00b! :rofl:

    in LFE, however, FLat FR is an absolute must!
     
  16. tjamz

    tjamz New Member

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    Sorry, that comment was more geared towards the guy who suggested just setting the full FR to flat by using test tones and an SPL meter.

    As for being a n00b to the audio world....been doing it for 15 years professionally.
     
  17. Ronin

    Ronin Guest

    Flat EQ settings on my set up doesn't sound bad at all, however due to preference i have it slightly tweaked

    and he was referring you to being an OT noob I believe
     
  18. eighteen_psi

    eighteen_psi Active Member

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    Also should be pointed out (in captain obvious fashion) there is a solid difference between flat EQ and EQing for flat response :hs:

    Flat response is good for setting up gains and finding resonances to deaden and stuff, typically worthless for actually listening to music. Well matched components and a good install will likely need little EQ work to get it sounding ideal. Poorly matched components will usually need a lot, even if they are individually very good. Just depends what you want out of the setup, what your installation limits, the skill of the installer and how much money you have to spend on it all.

    And forget the fact that microphone response isn't an linear absolute...and human hearing response is absolute in being not even slightly linear..for instance you would have to ramp levels variably such that your bottom was louder at low volumes and reduced itself, relatively, as levels increased, to counter the response of a typical human ear. Etc.
     
  19. Ronin

    Ronin Guest

    i always start off with everything EQ'd to 0 as much as possible and as time goes on I make appropriate adjustments which is why I suggested he do the same in the first place, it will provide an appropriate foundation for what he wants. :dunno:
     
  20. eighteen_psi

    eighteen_psi Active Member

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    This is solid..as is the suggestion to go DOWN not up. Cut with EQ, never boost. Boost with gain and cut out what you don't want.
     

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