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Thread: Bassreflex with JBL 2226h??

  1. #1
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    Bassreflex with JBL 2226h??

    First sorry, My english Are really bad.
    I have a 120 liters cabinet to my 15" JBL 2226h bass speaker, and going to make the cabinet a bassreflex cabinet, because the deep bass was really bad.
    What port size may i use? 1 or 2 ports? Please help
    spec for the speaker:

    Hz: 30-2500
    fs: 40 Hz
    Re: 5.0 ohms (H)
    Qts: 0.31
    ms: 5.0
    Qes: 0.33
    Vas: 175 l
    Sd: 0.088 m2
    Vd: 689 cm3
    Le: 1.75 mH (H)
    Half space 2: 3.3%
    Pe (Max)1
    Overall Diameter: 388 mm (15¹⁷⁄₆₄ in)
    Bolt Circle Diameter: 370 mm (14⁹⁄₁₆ in)
    : 137 mm (5½ in)
    Volume Displaced by Driver: 6 l

  2. #2
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    Hei Morten

    Pictures of the cabinet? Inner dimensions of the box? Speaker placement?

    Rebuilding a pair of srx. I started with a -6 dB bass shelf in win-isd. Then modelled in hornresp. It works because the box is tall.

    Mårten

  3. #3
    Senior Member Jan Daugaard's Avatar
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    2 tuning suggestions

    Here you have 2 tuning suggestions, both with a 10 cm port, tuned to 52 Hz and 40 Hz, respectively. In the first case with a 2 cm deep port (which, in effect, is a hole in the front baffle), in the second case with a 5 cm deep port.
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  4. #4
    Senior Member ivica's Avatar
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    Quote Originally Posted by Jan Daugaard View Post
    Here you have 2 tuning suggestions, both with a 10 cm port, tuned to 52 Hz and 40 Hz, respectively. In the first case with a 2 cm deep port (in effect no port -- the front baffle is about 2 cm thick), in the second case with a 5 cm deep port.
    In the case of 2226H driver usage , cone displacement can be limitation parameter if not hi-pass filter applied ( say under 30Hz). I think that 2226H is not the best solution for LF driver (without horn-loading)

    Regards
    Ivica

  5. #5
    Senior Member Lee in Montreal's Avatar
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    You won't go deep with a 2226 as it is a midbass driver, not a subwoofer. Tune the cabinet to 40Hz and give a 6db boost from 80 Hz downward. High pass at 30Hz is a good idea as there's no reason to waste power on that bottom octave that will never happen.

  6. #6
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    Red face Thanks

    Thank you every body for the help, im new with this bass speaker so tanks for all the helpfull information. I think i'm going to use a 4" port on 5 cm
    Again sorry about my bad english

  7. #7
    Senior Member Lee in Montreal's Avatar
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    A single port of 4" diameter x 2" length will tune a 120l enclosure to 40 Hz - http://www.psp-inc.com/tools.html

  8. #8
    Senior Member frank23's Avatar
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    Check this, enclosure 6 for the 2226: http://www.jblpro.com/pub/manuals/enclgde.pdf

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