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Thread: Displacement of horns and drivers

  1. #1
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    Displacement of horns and drivers

    I have seen displacements for most larger low frequency drivers, but I am curious to know if anyone has ever compiled a listing or spreadsheet of the displacements of high frequency horns and their related drivers as they would relate to internal enclosure volume.

    I have done a search here but found nothing.

    If not, anyone have any better ideas than using a "known" displacement container and pouring sand around a plastic wrapped horn and driver combo, removing it and then CAREFULLY measuring as you re-fill the container?


  2. #2
    Senior Member louped garouv's Avatar
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    some folks think that the volume lost in bracing and components is gained virtually through
    the use of insulation...

  3. #3
    Senior Member Lee in Montreal's Avatar
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    Calculate area (Pi x R^sq) and multiply by length. That should give you the volume of a specific compression driver.

  4. #4
    Senior Member grumpy's Avatar
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    If it's a large/deep horn, I'd just approximate or baffle it off internally...
    tuning will be off no matter how close you estimate volumes and will likely
    require adjustment (stuffing and/or port length).

  5. #5
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    Sounds like the easiest way to go

    Quote Originally Posted by grumpy View Post
    If it's a large/deep horn, I'd just approximate or baffle it off internally...
    tuning will be off no matter how close you estimate volumes and will likely
    require adjustment (stuffing and/or port length).

    I am building some Home Theater left and right fronts to fit my constrained space requirements. I do not want to completely change the living room decorating scheme (dramatically affecting WAF) just to use my JBLs again.

    So I may just do this anyway, using the internal baffle to add further support to the 2370 horns and compromise on the internal volume of the Low Frequency section. Right now I am very roughly calculating half of two horns and drivers, juxtaposed for a volume, as if I was squaring a simple triangle and taking half to attain a volume figure.
    It seems as I am calculating that with the horns mounted internally, required bracing, fairly large port, I will have just under 4 cubic feet to support an E140 for lows.

    I have a prototype built and it sounds pretty good, but once I decide to crank these babies, I am concerned I may need an additional brace or two.

    Common sense tells me to compromise on absolutely following recommendations and use these E140s in about a roughly 3.3 cubic foot enclosure, retuning the port into a slot and and simply continue to make them fit in the space I have.

    I don't need 40Hz out of my fronts, really, since I am already using a fairly impressive, biamped sub woofer system for LFE.

    My center is already in action, using two E110s and a 2370/2425 combo, tuned to about 70Hz and heavily stuffed. I am very pleased with this result.

    (Yes, I am bringing some leftovers from my old sound reinforcement system into the house to play movies through. )


    Thanks for all your suggestions, guys.

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