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Thread: Ebay oddity

  1. #1
    Senior Hostboard Member BillWojo's Avatar
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    Ebay oddity

    Ever see something like this before?

    Made for JBL 375, 2440, 2309 ALTEC 288 291 | eBay

    Seems that the sound waves after expanding in the phase plug would not like traveling through that long curved straight tube. I could be wrong but it sure looks like someones been smoking some wacky weed.

    BillWojo

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    Senior Hostboard Member GM's Avatar
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    Re: Ebay oddity

    No, just appears to be limited to a mids app since the bend radius is too tight for passing much in the way of HF at high gain.

    GM
    Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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    Senior Hostboard Member Elitopus1's Avatar
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    Re: Ebay oddity

    It drives me crazy how they drilled the bolt holes for the mounting studs different on each horn. If I bought some horns that put the back of the driver right in my face, I would want them to at least be oriented the same.

    Yeah I know you could probably just rotate the driver and rear cap and get them pretty close. Why not just drill the damn things the same way when you were making them?

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    Senior Hostboard Member BillWojo's Avatar
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    Re: Ebay oddity

    I'm wondering if they would really work well. I know sound can travel through a tube but something long and curved? Did this setup ever make it into production at JBL?

    BillWojo

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    Senior Hostboard Member GM's Avatar
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    Re: Ebay oddity

    Hmm, didn't look at all the pics; sloppy assembly, not orienting the mounting flange the same on both.

    Again, sound travels just fine around a bend as long as its radius is large enough. Look at how large the radius of the curved tube coupled to the driver of the early WE 15 horns is, which can pass 10+ kHz at high gain, then look at the acoustically tiny 'U' shaped bends of a BLH that can pass 30 Hz at high gain.

    GM
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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: Ebay oddity

    Why not just drill the damn things the same way when you were making them?
    They are 2 inch throat, and the flanges were properly drilled for the JBL 375/2240 4 bolt pattern.

    In addition to the throats being a gross mismatch, when properly indexed so the driver is oriented right side up and plumb/level, one of the Altec pattern bolt holes will interfere with one of the 4 bolt holes. The jackwagon hack is to rotate one of the patterns slightly. Since it's a 1.4 inch throat driver and doesn;t belong on there, guess who's pattern got rotated.

    Also, that thing is long enough that it's going to introduce a couple ms of delay, and that may have been it's originally intended purpose.
    Not all vegetables make good leaders.

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    Senior Hostboard Member GM's Avatar
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    Re: Ebay oddity

    Definitely, be it a tube or horn it's got to be acoustically long enough to load the driver down to 'x' low corner frequency.

    GM
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    Senior Hostboard Member Elitopus1's Avatar
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    Re: Ebay oddity

    The 4 bolt pattern is drilled at 3,6,9, and 12 on both horns. They could have drilled both the same with the 3 bolt pattern right? Not mirror imaged but the same on both sides

    And yes what a waste of time using a 1.4" driver on a 2" throat. Some 2"-1.4" reducers would have been better

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    Senior Hostboard Member gdmoore28's Avatar
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    Re: Ebay oddity

    As usual, I'm clueless on these. But he says that "the size and weight are similar to the original one."

    So, what was "the original one?" Are these based on something that somebody produced at one time?

    GeeDeeEmm

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    Senior Hostboard Member Elitopus1's Avatar
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    Re: Ebay oddity

    I sent the seller a message yesterday and asked that question. "What is this horn based on?" "What is the original one".
    He has not contacted me back yet.

    I have been searching for images of JBL curved horns and haven't found ones that look like these yet

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