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Thread: HELP with crossover for Altec 604E ( 8 Ohm )

  1. #1
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    HELP with crossover for Altec 604E ( 8 Ohm )

    Hello !
    i bought a pair Altec 604E . Make mesurements , both drive 604E have

    LW drive - 8 Ohm
    HF drive - 6 Ohm

    Audiophiles , pls, help with electronic scheme .
    my email :
    [email protected]

    Thanks to all !
    Alex
    Moldova , Republic of

  2. #2
    Senior Member Altec Best's Avatar
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    You shouldn't post your email address

    Hey Alex,

    You should use the PM's/email links, the roving Bot spiders and others can pick-up your email address and then you have a problem with spam an other possible issues !

    Good Luck w/project

    P.S. you may want to ask a MODERATOR to edit that for you."Unless it is a Disposable Address". You can give your email through PM's privately.
    "James B. Lansing" = Lansing Manufacturing ~ Altec Lansing ~ JBL

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    Hi .
    i read this site before .
    but not know :
    crossover 604 - 8 H will be good for 604 E ? ? ?

    can advise ?

  5. #5
    Senior Member grumpy's Avatar
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    The N1500A is suggested as being a good match at the jmarkwart site.

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    The N1500A is suggested as being a good match at the jmarkwart site.[/QUOTE]

    N1500A in the jmarkwart site for 16 oHm , as i think ....
    will be compatible with 604E - 8 ohm ?

  7. #7
    Senior Member grumpy's Avatar
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    OK, I think I understand the question better now, and perhaps the source of some confusion.

    Per this listing (if it is correct):

    http://alteclansingunofficial.nlenet...ele-Small.html

    the DC resistance measurement for the 604E driver is -supposed- to be around 7 ohms.

    The 604-8H has a different compression driver phase plug, and a different horn,
    so one might expect the crossover optimized for the 604-8H to be less optimum
    for the 604E. I have neither the drivers nor the crossovers to validate this assumption
    (I will accept 604-series donations though ).

    Unless I'm still not understanding (quite possible), it appears that jmarkwart's
    advice of the N1500A crossover is still appropriate, or you will need to experiment.

  8. #8
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    Quote Originally Posted by grumpy View Post
    OK, I think I understand the question better now, and perhaps the source of some confusion.

    Per this listing (if it is correct):

    http://alteclansingunofficial.nlenet...ele-Small.html

    the DC resistance measurement for the 604E driver is -supposed- to be around 7 ohms.

    The 604-8H has a different compression driver phase plug, and a different horn,
    so one might expect the crossover optimized for the 604-8H to be less optimum
    for the 604E. I have neither the drivers nor the crossovers to validate this assumption
    (I will accept 604-series donations though ).

    Unless I'm still not understanding (quite possible), it appears that jmarkwart's
    advice of the N1500A crossover is still appropriate, or you will need to experiment.

    =====
    Hello
    in this table DCR - 7 om .
    BUT for which driver ? LF or HF ?

    16 Ohm for which frequency ?
    i can check resistance on the different frequensy . i have different gears for mesuremnet

  9. #9
    Senior Member grumpy's Avatar
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    7 ohms in the referenced T/S table is for the bass driver
    (as are the rest of the values on that line)

    The HF driver impedance will depend on the diaphragm installed, but
    my understanding is that it has a 16 ohm rating in it's frequency operating
    range (DC resistance can be much less).

    There's at least one other thread here that is related (604E) and
    many more Altec-experienced members that may want to jump in.

  10. #10
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    i confused , because tim eto time on eBay i find sale 604E with photo tester which
    gave :
    LF = >11,4 - 12,5 oHm
    HF => 8,7 - 9,1 oHm
    Attached Images Attached Images     

  11. #11
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    as example , my 604 E
    HF - 6 ohm
    Attached Images Attached Images   

  12. #12
    Senior Member grumpy's Avatar
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    Sorry for having to ask this, but did you zero your
    meter first? ... often a requirement for accurate low
    resistance measurements.

  13. #13
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    Quote Originally Posted by grumpy View Post
    Sorry for having to ask this, but did you zero your
    meter first? ... often a requirement for accurate low
    resistance measurements.

    of cos ....make zero at first .

  14. #14
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    Quote Originally Posted by grumpy View Post
    Sorry for having to ask this, but did you zero your
    meter first? ... often a requirement for accurate low
    resistance measurements.

    today take Digital tester .
    for both drive unit have :
    HF - 9,1 oHm
    LF - 11,8 oHm

    what you think ?

  15. #15
    Senior Member grumpy's Avatar
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    All I can say is the DC resistance LF measurement seems high compared to the
    sparse information that I could find published on the 604E. Someone with more
    Altec experience/knowledge or a known-good/stock unit in-hand to measure will
    have to respond.

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