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Thread: Crossover for 2405 16 Ohm

  1. #1
    Member Dieter's Avatar
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    Question Crossover for 2405 16 Ohm

    Hi,
    im looking for a crossover-schematic 7500 Hz 12 or 18 db for the 2405 16 Ohm.

    Can somebody help?

    Thank you for the answers.

    BestRegards

    Dieter

  2. #2
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    You might want to look at the 3106 or 3107 high pass filters

    http://www.jblproservice.com/navigat...chematics.html

    The "best" is probably the 3145 or 3155 high pass filter.

  3. #3
    Member Dieter's Avatar
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    Hi Giskard,

    thank you.

    In the "frequency dividing Networks" pdf JBL says, that the 3105 and 3106 is for 16 Ohm.
    But in the:
    http://www.jblproservice.com/pdf/Net...%20Network.pdf

    JBL say it is for 8Ohm.
    Am i wrong?

    In:
    http://www.jblproservice.com/pdf/Net...%20Network.pdf
    JBL says it is for 16 Ohm
    What is about this network for he 2405?


    In:
    http://www.jblproservice.com/pdf/Net...%20Network.pdf

    JBL says it is for 8Ohm.

    Thank you Giskard: you are very helpful.

    Dieter

  4. #4
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    I think you are referring to the test loads in the network service bulletins. JBL has to have a standardized way to test networks and the answer is:

    http://www.jblproservice.com/pdf/Net...%20Fixture.pdf

    If you are measuring the voltage drive of a network LOAD Z tells you what to load the network with to obtain the values in the table:
    Attached Images Attached Images  

  5. #5
    Administrator Mr. Widget's Avatar
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    Re: Crossover for 2405 16 Ohm

    Originally posted by Dieter
    Hi,
    im looking for a crossover-schematic 7500 Hz 12 or 18 db for the 2405 16 Ohm.

    Can somebody help?

    Thank you for the answers.

    BestRegards

    Dieter
    I am using the 3155 circuit and it really allows the 2405 to sound great.

    Don't worry about it being referred to as an 8 ohm circuit. JBL is a bit weird about driver impedance. Since the 2405 is not as low an impedance as a true 8 ohm device they have been referred to as 16 ohm drivers. The actual impedance at the crossover region is more like 10 ohms I believe. For some reason they have also been referred to as 8 ohm drivers in other years.

    JBL has only made one impedance of the 2405/2405H even though the name plates say 8 or 16, and the JBL circuits are also labeled some 8 and some 16.

    The 3145 and 3155 crossovers are much more recent designs than the 3107 or 3108 and in my opinion are vastly superior. I realize that these are both crossed over higher than your stated 7500Hz, but the 2405 sounds better crossed over higher.
    Last edited by Mr. Widget; 05-24-2003 at 10:30 AM.

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