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Thread: Charge Coupled Crossover

  1. #61
    Senior Member christo's Avatar
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    Quote Originally Posted by dang View Post
    Hi, I'm planning to order parts from Solen.ca and build this xover for my 4344 (schematic attached) but then I just realize that there is no Low Frequency. Could anyone help explain where I would hook my bass driver to ? Thanks.
    Dang

    I made a typo in the network schematic I have posted the corrected diagam in the original thread.

    http://www.audioheritage.org/vbullet...BL-4344-Clones

  2. #62
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    You need an electronic crossover and two stereo amplifiers.
    @Odd right, so if I want a it as internal only crossover I'll need another scheme for the low pass. Would this scheme work for the low pass ?

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    @christo thanks for pointing that out.

    btw I live in Australia which makes it so difficult to order parts. I preferred the CC scheme because I can order everything in one go from solen.ca. If anyone knows of any one stop shop to order all the parts to build the 4344 xover please let me know, much appreciated.

  3. #63
    Senior Member Odd's Avatar
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    Is not as easy to see out of your drawing.
    If you only used it passively you will not need switches.

    Here's another variant you can look at

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    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

  4. #64
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    @Odd thanks. Do you know why +/- is inverted for 2235H/2245H as compared to the rest ?

  5. #65
    Senior Member Odd's Avatar
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    Crossover is designed so reversed phase provides a flat curve at the crossover point.

    More about reversed phase and crossovers;

    http://www.audioheritage.org/vbullet...5-clones/page3

    https://en.wikipedia.org/wiki/Audio_crossover

    If you have the possibility go for active.
    They provide better sound.
    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

  6. #66
    Administrator Mr. Widget's Avatar
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    Charge Coupled Networks

    Steering back towards the beginning of this thread... Ian and others on various other threads have explained the theory and practice of using the charge coupled technique. I'll add another data point.

    I have been enjoying my stock DD66000s with their factory charge coupled networks since March of 2012. Recently I thought something was amiss... my speakers were sounding rather honky. The sound was not unlike switching out my highly class A biased amps for a more typical class AB mosfet sort of sound. Not nasty or screechy, but a bit nasal and less transparent than what I have been accustomed to.

    Then I had an idea... how old are the batteries in my speakers? I popped the grille off and saw the expiration date. March 2015. Well. I guess I got an extra year out of them.

    I popped in 4 new batteries and almost immediately the sound returned back to that sound I love. Yes Virginia, CC'd networks do work.


    Widget

  7. #67
    Senior Member Ed Zeppeli's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    Steering back towards the beginning of this thread... Ian and others on various other threads have explained the theory and practice of using the charge coupled technique. I'll add another data point.

    I have been enjoying my stock DD66000s with their factory charge coupled networks since March of 2012. Recently I thought something was amiss... my speakers were sounding rather honky. The sound was not unlike switching out my highly class A biased amps for a more typical class AB mosfet sort of sound. Not nasty or screechy, but a bit nasal and less transparent than what I have been accustomed to.

    Then I had an idea... how old are the batteries in my speakers? I popped the grille off and saw the expiration date. March 2015. Well. I guess I got an extra year out of them.

    I popped in 4 new batteries and almost immediately the sound returned back to that sound I love. Yes Virginia, CC'd networks do work.


    Widget
    The skills of an attentive listener.

    I wonder how many owners of high-end charge coupled speakers have let their batteries die but didn't know any better. I imagine they either don't notice, get used to it or think they're falling out of love and sell them cheap!
    DIY Array, 2242 sub, 4408, 4208, Control 8SR, E120 Guitar cab, Control 1, LSR305.

  8. #68
    Super Moderator jblnut's Avatar
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    Thanks Widget

    I read this and thought "hmm...been a while since I've looked at the batteries in my 250's networks". So I took a look yesterday and was somewhat appalled that I had missed the window by more than I'd care to admit. Some leakage was evident on 3 of them and one had its post get trapped in the connector when I tried to remove it. OK, note to self...do this annually now.

    With 4 fresh batteries the sound is indeed a bit more detailed and there's a better sense of cohesion among all of the drivers. But bliss was short lived. The 044Ti's are on the way to Gordon now for some fresh damping foam. I've done all of the tube and cable voicing I can..it's time to solve the problem for good.

    So, the 250's are doing their best vintage speaker emulation now. They are a bit soft on the high end with no tweeters :-).

    jblnut

  9. #69
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    <<<SNIP>>>So, the 250's are doing their best vintage speaker emulation now. They are a bit soft on the high end with no tweeters :-).


    That's A Good One! ;0

  10. #70
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    Quote Originally Posted by dang View Post
    @Odd thanks. Do you know why +/- is inverted for 2235H/2245H as compared to the rest ?
    That is because JBL has been very inconsistent and stubborn in adopting the industry standard for polarity, so the red knob is negative and the black knob is positive only for some years of JBL. Use a flashlight battery to test the polarity and switch the knobs accordingly.

  11. #71
    Senior Member eso's Avatar
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    Old thread, but it seems like I could get the answer here.

    All of the schematics I see show the point where the 9V is applied between the caps, but where does the other end of the battery land?

    eso
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  12. #72
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    Battery Ground is attached to the minus side of the network.


  13. #73
    Senior Member eso's Avatar
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    Quote Originally Posted by Earl K View Post
    Battery Ground is attached to the minus side of the network.

    Thanks, that is implied, but why not just draw it into the schematic?

    So like this? Or doI just need one battery charging both the mid and high filters?
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  14. #74
    Administrator Robh3606's Avatar
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    Or doI just need one battery charging both the mid and high filters?
    One will get it done.

    Rob
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  15. #75
    Senior Member grumpy's Avatar
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    Might also look into the later-implemented use of a diode to rectify the audio signal, thus providing the bias voltage with no need for a battery.

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