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Thread: 033 HF best hz xover?

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    033 HF best hz xover?

    I've got a speaker project using 033s as the tweeters and 104hs as the mids. Can I use a L166 xover that kicks the tweets in at 6000hz. I also may be able to use a L80t3 xover which crosses the tweets at 4500hz. Also the L80t3 xovers look to be more up to date (more caps and coils). Any ideas??

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    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by midlife View Post
    Any ideas??
    I don't know anymore about this stuff than you do, but if I were putting together a Frankenstein project from a mix-and-match driver collection, I'd probably want some L-pads in there to give me at least a shot at balancing the motley crew into something like what I was hoping it would be. :dont-know
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

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    Quote Originally Posted by BMWCCA View Post
    I don't know anymore about this stuff than you do, but if I were putting together a Frankenstein project from a mix-and-match driver collection, I'd probably want some L-pads in there to give me at least a shot at balancing the motley crew into something like what I was hoping it would be. :dont-know
    I agree, and I would add Lpads if the xover of choice doesn't have them. Due to availability I have some what narrowed it down to; L166 xovers or L80t3 xovers. Being new to builder projects I am still looking for someone with experience to help with the options. thanks.

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    Senior Member rdgrimes's Avatar
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    The only way any XO will work right is if the drivers used have identical impedance as those the XO was designed for. If not, the XO point will be somewhere else.

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    Quote Originally Posted by rdgrimes View Post
    The only way any XO will work right is if the drivers used have identical impedance as those the XO was designed for. If not, the XO point will be somewhere else.
    Do you mean dcr values or stated component ohms ratings? I believe all the drivers in either the L80t3 and L166 are rated @ 8 ohms. And the drivers I would like to use are also rated @ 8 ohms.

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    Senior Member Fred Sanford's Avatar
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    Quote Originally Posted by rdgrimes View Post
    The only way any XO will work right is if the drivers used have identical impedance as those the XO was designed for. If not, the XO point will be somewhere else.
    Impedance + efficiency + response curve, I'd think.

    je

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    Quote Originally Posted by Fred Sanford View Post
    Impedance + efficiency + response curve, I'd think.

    je
    Makes sense, and I have considered those parameters. I would be using 033 tweeters, 104h mids, and 123a woofer, commonly employed drivers in JBL speaker systems, is their combination very unorthodox to the point of being incompatible or too difficult to crossover? I don't mind a bit of a challenge and I still would like to put these components in my L88 cabinets, but really if I'm about to drive a square peg in a round hole...

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    Quote Originally Posted by midlife View Post
    Makes sense, and I have considered those parameters. I would be using 033 tweeters, 104h mids, and 123a woofer, commonly employed drivers in JBL speaker systems, is their combination very unorthodox to the point of being incompatible or too difficult to crossover? I don't mind a bit of a challenge and I still would like to put these components in my L88 cabinets, but really if I'm about to drive a square peg in a round hole...
    Are there any known efficiency discrepensies that would make the above listed drivers a mismatch? And if so could I add a resister to the driver to help make it play better with the others? thanks

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    Quote Originally Posted by Fred Sanford View Post
    Impedance + efficiency + response curve, I'd think.

    je
    And don't forget, impedance is not constant with frequency.

    This is why crossovers are by far the hardest part of a speaker. To be done properly, you should simulate as much as possible, build, measure, and refine.

    This is also, to some extent, why the simplest crossovers are best. You still have to do all of the above, but when you're working with a simple crossover, there's less moving pieces, and it assumes (and requires) well-behaved drivers.

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    Senior Member rdgrimes's Avatar
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    Quote Originally Posted by midlife View Post
    Do you mean dcr values or stated component ohms ratings? I believe all the drivers in either the L80t3 and L166 are rated @ 8 ohms. And the drivers I would like to use are also rated @ 8 ohms.
    I believe you should be looking at the DC resistance of the drivers. The 033 is 3.6-4.4u. The 104H DC resistance I cannot find, but it will be different from the LE5 series. The LE5-8 runs 5.6 - 6.8u. These are the numbers you will get if you check resistance across the 2 driver connectors. If these values vary from what the XO is build for, both the XO point and the attenuation curves will change. L-pads won't effect either of those variables. Unless the XO is designed specifically for the drivers in use, it's a real crap shoot what it will sound like.

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    Administrator Robh3606's Avatar
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    Hello midlife

    This is what you need to design a crossover. A measurement system to get you a set of in baffle measurements of all the drivers and a set of impedance curves for each. Then add software such as LEAP or Crossosver Shop to plug it into.

    You have had a couple of crossovers suggested to you that use the 033 and an LE-5 variant midrange driver. Use those to determine what would work best in the abcense of measurements or the required software.

    Rob
    "I could be arguing in my spare time"

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