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Thread: JBL 2245 : 10 or 12cft

  1. #61
    Senior Member Champster's Avatar
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    Thank you svollmer for the excellent feedback! Does anyone else have an experience with the 12cf box & its vents?
    Paul

  2. #62
    Senior Member svollmer's Avatar
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    No problem. Just remember, we want to see pictures of what you build!J

    Also, I had originally built two of a different version of the subs at my last house. I used different dimensions than my current boxes because I wanted them to match my main speakers’ height. I also obtained 9” round Sonotube for the vents. I can tell no audible difference between my last subs and these with different dimensions and square vents.

  3. #63
    Senior Member Lee in Montreal's Avatar
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    Hi Champster

    May I sugget you model the 12cft cabinet with 3 different tunings and see how it affects your two bottom octaves. Test tuning to 20Hz, 23Hz and 26Hz... When you tune to 20Hz, you will probably give away some of the "real life bass" around 30-50Hz.

    Also, I don't think that two 4" tubes will be enough. Try a pair of 6" or three 4". May I also suggest you check how Onken cabinets use bracing to stiffen the panels and create vents at the same time.

    Oh, and try 12,5cft internal volume (excluding vents, bracing and driver volume).
    "Volume = 5.7*(Vas*(Qts^2)) which is around 12.5cft for the 2245. No early knee and no ripple."







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