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Thread: Biased 4406 networks

  1. #1
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    Biased 4406 networks

    There have been a few inquiries about biased 4406 networks.

    I figured I'd post a few quick snapshots of my mini-monitors. They're fun.

    New boxes for 18Ti components along with new boxes for their little 121A subs. There's a charge-coupled 4406 network in that 115H-1 hole. L-Pad knobs aren't installed until the boxes are finished. Piano black lacquer finish maybe.

    Other stuff - tired L212, mainstay L96/4313B hybrid, 4435 components, LE14H-1. One project could be pairing the LE14H-1's up with the 2344A/2425H's in nice sized 3 cu ft boxes... Maybe someday. 250XPL's and surround sound Ti Series are probably first.
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    Administrator Robh3606's Avatar
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    Nice show and tell!!! I like all those goodies!! I have 3 pairs of L20T'T3 floating around is it worth doing the CC for them??

    Rob

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    I want to say it ran me something like $100 a pair to do new biased filters (I didn't reuse any stock parts but could have).

    You know how everyone's own creations are... there is a built-in bias (no pun intended) and unless they really stink... I had to have some guys and gals listen to them that couldn't give a rat's ass about JBL and cared even less about biased anything, they just like good music, preferably live. We A/B'd stock 18Ti's and stock 4406's and the biased hybrids won hands down. It's like they're alive. Very nice for a "minimal" loudspeaker. It was worth it to me.

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    Administrator Robh3606's Avatar
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    Thanks!


    I really like them. They really sound good as they are I will give it a try. Nice Sunday project

    Rob

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    Quote Originally Posted by Robh3606
    They really sound good as they are.
    Yes, they certainly do.

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    Senior Member spkrman57's Avatar
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    One battery for all the charged caps???

    I remember some circuits(crossover) of bias(charged) that I seen on this forum somewhere in my researching. In some of them I noticed there were more than one set of caps to be biased in the same system. Will "one" battery work for that, and would it not introduce a way for the different crossover functions to affect each other??? Or did I not pay enough attention to them when saw them?

    Ron

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    The resistors between the capacitor pairs and the battery are 2 to 5 megohm. One battery for all the capacitors. One 3 megohm resistor for each capacitor pair.

    In my pair I used Dayton Metallized Polypropylene mains and AudioCap Theta bypasses.
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    Senior Member spkrman57's Avatar
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    Battery current draw must be small with that high of resistance!

    Is there any special way to design a crossover using CC design?

    I am thinking of 2226/2426/075 3-way supplemented with 2242 for bottom octave help.

    Is there any threads already posted that would help me in designing such a crossover?

    Thanks, Ron

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    Nothing special. Just double the capacitor values of a "regular" network to get the biased pair. In the above schematic the two 6.0 uF = the stock 3.0 uF value, etc.

    The battery should last for the length of it's shelf life.

  10. #10
    Senior Member spkrman57's Avatar
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    thanks Giskard!

    At the very least I should try and breadboard one to try out.

    I am still at odds at what crossover to try with my 3-way (2226J/2426J/075). I have looked over all the schematics listed here and there on this forum and tried to compare to the models JBL put out over the years, but have yet to find something close.

    It seems that I am trying to put a "dinasour" system together with modern technology!

    Ron

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    RIP 2011 Zilch's Avatar
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    If it's 2226H (you said J) or a pair of 2226J, I'd be starting with 3110 or 3110A (depending on the horn) and 3105.

    Simpler approaches may be found in Cabaret and SR series.

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    Giskard - looking at that charged-coupled diagram, it looks like this eliminates the need for bypass caps? (I'm still trying to get a handle on what this stuff does and how it works...)

    John

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    It's supposed to eliminate the need for bypass caps. I didn't like the sound of the bare Dayton MP mains. I tried adding Dayton poly films and didn't like them either. The Audiocap poly films seemed to be the icing on the cake. Just my personal take on the matter.

    If you go with Solen caps they are not supposed to need bypass caps.

  14. #14
    Senior Member spkrman57's Avatar
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    What are the voltage parameters?

    Would there be any difference in using a higher voltage source other than the 9 volt source?


    Zilch: I have 2226J and 2426J plus the 075 which is 16 ohm or 8 ohm(I have read here they are same and treated as 10 ohm drivers).

    I have 2226H, but it is set aside for a different system for me to play with.

    I will have to check out the cabaret/SR systems for more reference.

    Ron

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    Senior Member Rusnzha's Avatar
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    Does anyone have a diagram for a biased crossover in an L100?

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