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Thread: JBL 2245 : 10 or 12cft

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    Senior Member ivica's Avatar
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    Quote Originally Posted by Lee in Montreal View Post
    Actually, it gave me some clues, but didn't answer all my interrogations. Per exemple, the ports is de facto tuned to Fb. I can't find how to tune the port to the driver's Fs 20Hz, or somewhere between Fs and Fb.

    So far it goes like that. 10cft vs 12 cft tuned at Fb 27,3Hz

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    Excursion at 350w

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    Changing the size (typically the length) of the port-tube you can change "tuning of the WHOLE SYSTEM", (box+port resonant frequency Fb) and what would be the influence of such (tuning or changing) to the WHOLE SYSTEM RESPONSE, you can easily see using mentioned simulation programs.
    Here are some examples:
    it seems that "what-ever-you-do" you will get -6dB around 30Hz....
    so it seems to me that optimum in maximal cone displacement "in band", and "out of band" would be the 'leading rule'.
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