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Thread: 2405: Real difference between 8 Ohms and 16 Ohms..

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    Junior Member eziodoc's Avatar
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    2405: Real difference between 8 Ohms and 16 Ohms..

    Hello friends,
    do exists or you know real differences, in terms of sound quality, between the two 2405 tweeters, at 8 Ohms and 16 Ohms?
    Sorry if the thread was discussed, but not seen by me..

    Thanks.
    Ezio

  2. #2
    Administrator Robh3606's Avatar
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    No none at all.

    Rob
    "I could be arguing in my spare time"

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Robh3606 View Post
    No none at all.
    Not only are there no sonic differences, there is no difference except for the printed label. All 2405s and 077s are the same. They are approximately 10 ohms.


    Widget

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    Senior Member Beowulf57's Avatar
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    If the diaphragm has been replaced with an aftermarket model at some point, the impedance may be different from the original JBL. For example if an "8 ohm" JBL diaphragm was replaced with an "8 ohm" aftermarket model, that diaphragm may actually have a DCR of 3.2 ohms, rather than the ~6.2 ohms of the original.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Beowulf57 View Post
    If the diaphragm has been replaced with an aftermarket model at some point...
    If the diaphragm is aftermarket, who cares what the impedance is... in my opinion it is no longer a 2405. It will almost certainly not perform as specified.


    Widget

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    RIP 2013 Rolf's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    If the diaphragm is aftermarket, who cares what the impedance is... in my opinion it is no longer a 2405. It will almost certainly not perform as specified.


    Widget
    Agreed!

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    Senior Member Beowulf57's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    If the diaphragm is aftermarket, who cares what the impedance is... in my opinion it is no longer a 2405. It will almost certainly not perform as specified.


    Widget
    I simply wished to inform him of the possibility that he could end up with an "8 ohm" unit that might not be identical to an original "8 ohm" unit.. Now, he has at least one method of checking and that is why I cared.

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    Quote Originally Posted by eziodoc View Post
    Hello friends,
    do exists or you know real differences, in terms of sound quality, between the two 2405 tweeters, at 8 Ohms and 16 Ohms?
    Sorry if the thread was discussed, but not seen by me..

    Thanks.
    Ezio
    Ezio,
    on the "VideoHifi" forum I gave you the same answers you got here....
    Hope you'll enjoy your 2405 with peace of mind, regardless the impedance label...
    cheers



    Michele

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    Senior Seņor boputnam's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    Not only are there no sonic differences, there is no difference except for the printed label. All 2405s and 077s are the same. They are approximately 10 ohms.
    Yessir.

    And, if you ever have a doubt about such things, take out your multi-meter and measure the DCR of each. It's a good idea anyway...
    bo

    "Indeed, not!!"

  10. #10
    RIP 2010 scott fitlin's Avatar
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    i dunno, I always thought Alnico 075 bullets had a slightly softer top end sound.

    However, I use ferrite 2402H, and they are CRISP, and INCIIVE, so, I never thought about alnico.

    Conversely, I love Alnico mag, Aluminum diaphragm 2in drivers, maybe the phragm material more than anything?

    Now, recently, I heard two setups, one with 2446J, Ti phragms, and another, same company, 2450J, neo mag Ti phragms, 2446 sound goood. 2450J was really good, guy uses crown Power L<ine Four amps for comp drivers, 2450J sounds great witgh todays sxource material, becausze IT handles MORE power than my sweet, older 2 in drivers.

    Remains smooth, with sharp image, no breakup or ring at high SPL levels, using higher power.

    I also heard the 2446 going all the way up, no tweeter.

    Im not sold on that, yet. Still like tweeter to go the distance high. Delicate top. 24456 goes up, but kind of like driving a Caddillac Escalade like you think its a BMW M3. You can sort of, but ......... not really.

    Although, I have modernized considerably, and with very positive results. I don't miss what I have taken out.

    The NEW stuff can and DOES work.

    I KNOW! Im recanting everyhing I have always said, but...... oh well.
    scottyj

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    I prefer the new professional drivers and networks over the vintage stuff.

    ...hope I don't get flamed here - yikes!

  12. #12
    Senior Member Hoerninger's Avatar
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    [quote
    Quote Originally Posted by robertbartsch View Post
    ]...hope I don't get flamed here - yikes!
    Why should this happen?
    I prefer the new professional drivers and networks over the vintage stuff.
    This new gear is simply working. There is no need for repair so far, there is no need to mention in a Heritage Forum.
    But the new gear can give hints for improvements.
    ___________
    Peter

  13. #13
    Administrator Robh3606's Avatar
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    I prefer the new professional drivers and networks over the vintage stuff.

    ...hope I don't get flamed here - yikes!
    What's wrong with that it's all JBL??

    Rob
    "I could be arguing in my spare time"

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    New carcusses - a vultures' dream

    http://www.theaudioauction.com/index.php?a=2&b=2247


    ^ This dude has two hundred 18" JBL 2240H carcasses to sell, so apparently, a few "new" profesional series JBL drivers are in need of repair.

    Anyway, I've been looking for a used JBL 2206H (12 inch woofie) for a while on Flee-Bay but I do not see any. Oh well, I'm sure one will show soon, I suppose.



  15. #15
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by robertbartsch View Post
    This dude has two hundred 18" JBL 2240H carcasses to sell, so apparently, a few "new" profesional series JBL drivers are in need of repair.
    No, that's what replaced them, obviously.

    We DO, however, know what to make outta those....

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