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    Btl T-line

    Has anyone had any experience using BTL's in a T-line or folded horn? Any reason this would or would not be a good idea?



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    Re: Btl T-line

    18" BTL T line? Sounds deadly. Would like to hear this too



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    Re: Btl T-line

    You're not going to have near enough room to do anything close to that with two or even one 18.



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    Re: Btl T-line

    Holy cow that'd be a huge box



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    Re: Btl T-line

    Folded horn wall mehbeh? Doesn't Pete K have a one of these for 2 15"s?



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    Re: Btl T-line

    Yeah, it was for 2 15" RE Destroyers then for some SS XXX 15's. I had a folded horn for 2 12" BTL's in my truck.. All I can say is it what was just rediculous. To bad I cant fit 15's or 18's for that matter in one



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    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    Re: Btl T-line

    Quote Originally Posted by bass-aholic View Post
    Folded horn wall mehbeh? Doesn't Pete K have a one of these for 2 15"s?

    No, and for the last god **** time that box was NOT a "folded horn". A real folded horn would perform horribly in a B-pillar wall.



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    Re: Btl T-line

    Quote Originally Posted by Pyro_By_Nature View Post
    No, and for the last god **** time that box was NOT a "folded horn". A real folded horn would perform horribly in a B-pillar wall.
    Pete's horns are really just expanding transmission lines but you could easily argue that they display properties of each, even if neither are "classical" models.

    A BTL should work out very well in either a horn or transmission line.



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    Re: Btl T-line

    Quote Originally Posted by Immacomputer View Post
    Pete's horns are really just expanding transmission lines but you could easily argue that they display properties of each, even if neither are "classical" models.

    A BTL should work out very well in either a horn or transmission line.
    The expansion is so small though, you can't really call them any kind of horn.

    Those boxes use design theories and properties from a couple different types of boxes, but truthfully aren't much more than a ported box

    I say this with having extensive experience with the "rear loaded horn, folded horn, SS, DS, transfoldedporthorn" or whatever other funky name people come up with for them.



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    Re: Btl T-line

    Quote Originally Posted by Pyro_By_Nature View Post
    The expansion is so small though, you can't really call them any kind of horn.

    Those boxes use design theories and properties from a couple different types of boxes, but truthfully aren't much more than a ported box
    Those enclosures offer more 1/4 wave properties than helmholtz properties; they're much less like bass reflex than they are 1/4 wave resonators.

    You're also wrong about the expansion rate. Just because the expansion is small does not mean it will not have horn properties. What you're probably thinking about is an exponential horn that has a mouth cross sectional area large enough to support the full wave length of the low frequency cutoff. While exponential horns are the archetype of horns, that doesn't mean that anything not exactly like it will not have similar properties. Hyperbolic flares, linear flares, and conical flares are all methods of approach for getting horn properties and there is nothing wrong with them. They all have drawbacks to their design but they're still representations of horn designs.



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    Re: Btl T-line

    would anyone car to show me a design for a 15" btl curious what are these for all out spl or what



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    Re: Btl T-line

    no a t-line is for sq... btl is for spl hence me being sorta surprised at this thread. i could be mistaken thou. i wait the responses




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    Re: Btl T-line

    This is what my box looked like for 4 BTL 18's.. Very musical.




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    Quote Originally Posted by PV Audio View Post
    It will never be proved that loudness is somehow related to SPL because it isn't.

    Loudness, a subjective measure, is often confused with objective measures of sound pressure such as decibels or sound intensity.
    Quote Originally Posted by Pete Kulicki
    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    Re: Btl T-line

    Quote Originally Posted by Immacomputer View Post
    Those enclosures offer more 1/4 wave properties than helmholtz properties; they're much less like bass reflex than they are 1/4 wave resonators.

    You're also wrong about the expansion rate. Just because the expansion is small does not mean it will not have horn properties. What you're probably thinking about is an exponential horn that has a mouth cross sectional area large enough to support the full wave length of the low frequency cutoff. While exponential horns are the archetype of horns, that doesn't mean that anything not exactly like it will not have similar properties. Hyperbolic flares, linear flares, and conical flares are all methods of approach for getting horn properties and there is nothing wrong with them. They all have drawbacks to their design but they're still representations of horn designs.
    You took what I said about the expansion rate and twisted it some. I didn't say it doesn't have horn properties I said you can not call them a horn just because there is some properties aka an expansion rate. Even then, an expansion of 2-3" still isn't that much. Please do not insult my intelligence and try to tell me what I'm thinking of. The only reference I made to a exponential horn was post #7 in saying it wouldn't do all that great in a walled vehicle.

    Keep in mind with some of the different "versions" of these enclosures are not just pure expansion, it's expansion and compression. But from what I've seen from pete he tends to lean more toward just expansion. I'm not 100&#37; sure about his wall though, as tuan designed it and not pete.

    Yes I'll admit leans towards 1/4 wave properties more, but you can't really call them a transmission line. The simplest way to describe the box is hybrid.
    Last edited by Pyro_By_Nature; 02-07-2009 at 01:49 PM.



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