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Thread: My new custom built 10' subwoofer

  1. #21
    This is so intresting thank you lira for sharing

  2. #22
    diysmps Senior Member Lira's Avatar
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    Quote Originally Posted by mkubawat View Post
    how to test a speaker with pink noise & where i find it
    Its simple, first you need a reliable pink noise sourcehttp://www.burninwave.com/, such a software with a good sound card( like maudio or similar, cheap audio card wont work) or an audio processor like behringer utracurve pro (DEQ2496) (This one is what i use), a good condenser mic, plugged in the sound card and a software for spectrum analize like TrueRTA http://www.trueaudio.com/rta_abt1.htm, to power the speaker, you need a amplifier with a maximum 0,002THD 100W RMS.

    You have to equalize the pink noise output to be as flat as possible in all range of frequencies with the mic that you are using. than you can test the speaker.

    Later i put the pink noise with 70% of the power of the amplifier to soften the speaker (I know, it will be a bit loud) and leave for 48hours, than i make all the tests again.


    That's it. if you have any further questions I'm here to help

    Best Regards
    Studying electronic engineering
    Fanatic for audio
    Crazy for biiiiig speakers

  3. #23
    diysmps Senior Member erhan739's Avatar
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    Thumbs up

    Thanks LİRA, It's a good explanation

  4. #24
    hi Lira
    sorry but i don't understand, What role will the mic and where to put

  5. #25
    diysmps Senior Member Lira's Avatar
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    Well, it's good you record the pink noise on any device such as a good mp3 recorder on 320kbps, and use this as a external pink noise source, them plug the mp3 player on the line in of the soundcard and see if the pink noise of your source is accurate. Be sure to disable any equalizer or sound enhancement devices on the mp3 player to have the pink noise flat. Once you have your source of pink noise ready to go, plug off the soundcard and plug in on an amplifier. Now you put the mic on the mic input of the soundcard, (You can use a mixer between the soundcard and the mic but you will have to plug the mixer on the line in of the soundcard), and start testing. the mic must be at least 20cm of the speaker. If you want you can use a sealed box to make this test, than you can see the curve of frequency of your speaker on the trueRTA. Its a bit tricky to get it working for the first time and get the right parameters, you have to watch for the volume to not saturate the sound of the speaker, testing different volumes, you will get the idea how your speaker can operate in differents powers.

    That's it. if you have any further questions I'm here to help

    Best Regards
    Studying electronic engineering
    Fanatic for audio
    Crazy for biiiiig speakers

  6. #26
    Thanks Lira

  7. #27
    anybody know about scratch resistant mat black paint for commercial speaker box & where to find in india

  8. #28
    hi
    any one know ,what is the benefit of reverse fitted woofer

  9. #29
    diysmps Senior Member Lira's Avatar
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    You mean put the woofer reverse on the box like this?

    Or this?
    Studying electronic engineering
    Fanatic for audio
    Crazy for biiiiig speakers

  10. #30
    like a first picture
    also post about phase system when play many speakers , woofer (when all speaker are at a place)

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