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    advanced: box alignments and theroy

    So all you genious builders (jmac if you are reading )

    i have a question that i still have yet to fully understand. i would like a good discussion, and some links if you guys are up for it.

    when designing a box, say winisd for simplicity - its ok for getting rough estimates on the port tuning and keeping params handy. but it dosnt give accurate graphs when it comes to most everything else.

    so then comes all the little details about box building, how big, port area, bla bla bla. what about the 'alignemnt', or 'Q' of the box? say i bult a random box for a random speaker, how do you figure out what the Q is? and why is there always talk of ".707"? what are the advantages\drawbacks of different alignments?

    and what other kinds of factors matter other than volume\tuning (not including bracing and stuff like box placement and the likes) - i mean, things that people usually WONT think about when designing a box, like impedance rise, power compression and stuff like that?

    id just really like to read some information that matters to apply to what i currently know about designing loudspeaker boxes (sealed and ported for now, TL, FH, and BP boxes will come later ).

    if anyone has good info to contribute to those (including myself) who like building boxes and expierementing with different equipment, please do. any links to discussions that have been previously gone over are welcome.

    i do know there is no endall beall of enclosure design, but what to aim for in many kinds of applications, and why.

    i think thats all. i cant quite think of anything else

    thanks for reading.







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    Re: advanced: box alignments and theroy

    what about the 'alignemnt', or 'Q' of the box?
    Advanced? N00b. That isn't advanced, it's fundamental

    "System Q" is a term thrown around in a lot of fields in electronics (in RF, for example, it's the ratio of reactance to resistance in a series circuit like a loaded antenna)...but in acoustic terms, it's related to the enclosure volume, transient response, and frequency.

    http://www.geocities.com/kreskovs/Box-Q.html

    That page could explain it quicker than I can.




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    Re: advanced: box alignments and theroy

    Quote Originally Posted by req, 2006 spelling champion
    theroy





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    Re: advanced: box alignments and theroy

    thanks

    i forgot to spellcheck

    and by the way. i have not looked into this stuff at all really. i never got around to it. so yea. dont flame too bad




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    Re: advanced: box alignments and theroy

    Jeez req....I just went over this less than a week ago

    http://forums.caraudio.com/vb/showthread.php?t=101057

    EDIT: Well....seems like less than a week ago, after looking at the date it's been a few weeks now. But, regardless....search n00b




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    Re: advanced: box alignments and theroy

    Quote Originally Posted by req, whose n00bnezz is an example to us all
    dont flame too bad
    I'll supress the overwhelming desire to At least, mostly

    http://www.diysubwoofers.org/sld/sealed2.htm

    That's how Q is related to frequency response for a sealed system.




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    Re: advanced: box alignments and theroy

    thats all i wanted.

    sorry for being a newb at some things, but i could venture to guess you guys have never fiberglassed

    lol, i just never looked into it is all




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    Re: advanced: box alignments and theroy





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    Re: advanced: box alignments and theroy

    I didn't click the link....but if that's what I think it is (box program setup in Excel), then it, in all likelyhood, is more accurate than WinISD




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    Re: advanced: box alignments and theroy

    Well those links are what I was thinking of when I was reading your post req.

    And winISD has the Q rating on there. I, myself prefer to do a 1 - 1.5 Q. I find that is actually the sound most peiople are looking for. I say most, not all.





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    Re: advanced: box alignments and theroy

    Quote Originally Posted by req
    thats all i wanted.

    sorry for being a newb at some things, but i could venture to guess you guys have never fiberglassed

    lol, i just never looked into it is all
    noob....now what are you going to say to me?

    read up, as I'm sure you have done on most of the links in this thread. It's solid information, great links Frosty and Squeak...btw...

    NG




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    Re: advanced: box alignments and theroy

    Quote Originally Posted by req
    thats all i wanted.

    sorry for being a newb at some things, but i could venture to guess you guys have never fiberglassed

    lol, i just never looked into it is all
    Anyone else see a problem here....?



    What the f00k happened to this place?

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    Re: advanced: box alignments and theroy

    BTW *** cheebah, have You used CF and epox in a vaccum bag yet? Or acutally seen kevlar matt? **** fiberglass cloth & tape, go big or go home.

    Don't ****ing think that You are gods gift to composites.. jerkoff.

    -Nick



    What the f00k happened to this place?

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    Re: advanced: box alignments and theroy

    lol



    i drive a honda element.

    -Eclipse AVN h/u
    -custom fiberglass doorpods
    -CDT 7.2usx comps
    -mmatts SQ####? amp (200x2wrms underrated)
    -"custom" TC9/XXX 15"
    -Cadence zrs-10

    and lots and lots of bjork.

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    Re: advanced: box alignments and theroy

    Quote Originally Posted by NjccBflo
    BTW *** cheebah, have You used CF and epox in a vaccum bag yet? Or acutally seen kevlar matt? **** fiberglass cloth & tape, go big or go home.

    Don't ****ing think that You are gods gift to composites.. jerkoff.

    -Nick


    XOXOXOXOXOXOXO




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