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How low is enough?

Discussion in 'Home Cinema Speakers' started by JIT, Apr 19, 2002.

  1. JIT

    JIT
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    How low does a sub have to go to give a good bottom end response?
     
  2. Stewart C

    Stewart C
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    In my opinion 20Hz.

    Some go lower but I am happy with the shake rattle and roll at 20Hz

    Regards
     
  3. JSW

    JSW
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    How can you test how low yr sub is ?

    I ask because I have the sub in my sig and its rated low is 50hz but im sure its lower.

    On the extra's disc of FF Spirits Within I watched Akiras dream and it opens with some superb thunder, the volume on the amp is easy listening level -47 and my kitchen door rattles in its frame so badly that i have to open it a bit to stop it. Didn't need to open the hall door as it wasn't closed properly and it vibrated open itself.

    The doors are made from mdf so theyre not exactly lite so wat can I do to stop them ressonating so much?

    Thanks
    Bryan

    Oh the amps volume is set at about 40 % and xover 70 hz
     
  4. Jase

    Jase
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    Test discs such as AVIA or Video Essentials have bass sweeps, speaker test tones etc

    AVIA available here

    www.ovationsw.com

    Video Essentials here

    www.ezydvd.com.au

    Or dvds such as the Phantom Menace that have the THX Optimiser on them.
     
  5. JIT

    JIT
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    What about the Paradigm PDR10 at 27Hz? I've heard good things about it considering it's only £120.
     
  6. Nic Rhodes

    Nic Rhodes
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    I would also say 20Hz as a good rule of thumb (14Hz is nice though!) for AV, CD has few signals below 30Hz (the odd organ pipe). What really needs to be said is how loud and how much distortion these subs produce at these low levels. There is little point having a –6dB point for a sub running at say 10 % distortion. Similarly there is little point having a sub having a –6dB point measured at say 80dB when you want to operate it at 100+ dB. The low end point needs to be able to hit the low notes at the volume levels used, with low distortion. Few do this, unfortunately.

    There is a huge difference between manufacturers specifications and real world operations, despite what people might like to convince themselves otherwise with.

    http://www.hometheaterhifi.com/volume_8_4/subwoofers-12-2001.html

    is a useful resource for technical info
     
  7. General Skanky

    General Skanky
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    Jase, where did you download the test tones from?
    Thanks.
     
  8. lmccauley

    lmccauley
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    He got them from here. I downloaded them and posted my results here.

    Cheers,
    Liam
     
  9. General Skanky

    General Skanky
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    Thank you.
     
  10. General Skanky

    General Skanky
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    Liam, the low freq tones are labeled and easy to identify, but what are all the others?
    I've downloaded a couple and there is no way to know it's freq!
    Do you know what freq the tones are at?
     
  11. lmccauley

    lmccauley
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  12. General Skanky

    General Skanky
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    Yes.

    Obvious now.:blush:

    Thanks mate. I did wonder why the labels went to odd numbers.
    I'll get my coat.:)
     
  13. lmccauley

    lmccauley
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    No probs.

    I don't take the p;ss out of people that make obvious mistakes because it just gets too embarrasing when I do it myself. Like this morning when I nearly drove into a car that was actually turning in front of me rather than going straight ahead :blush:. Boy, did I feel sheepish... :(.

    Cheers,
    Liam
     

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