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Thread: Biamped L250ti Jubilee Clone

  1. #1
    Administrator Robh3606's Avatar
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    Biamped L250ti Jubilee Clone

    I have been messing with this for about 2 years now. Got the driver set about then and have been working on it on and off since. I have the crossover design finished and most of the parts. I am going to build CC networks for the top end and use my DX-1 with custom cards for the transition between the Le-14 and the 108H.

    The cabinets will be in two pieces using a clone for the top and a deeper base. I won't be using the volume in the top half of the cabinet. I want to hide the networks in there. That cabinet is a pain to clone compared to a simple rectangular box. Have the top panels cut no I just have to get them together, routed and semi-finished.

    I will post more as I make progress.

    Rob
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  2. #2
    Senior Member Guido's Avatar
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    Thumbs up

    Looks COOL Rob

    Keep us posted

  3. #3
    Administrator Robh3606's Avatar
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    Here's one of the rough cabinets still has to routed and a tweeter bezel made up for it. Now that's going to be fun

    Rob
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    Administrator Robh3606's Avatar
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    Looks better with the round overs done. They need to be hand sanded though to finish them. I used a 1/2" roundover bit. That looks right from the photo's I have. Anyone know if that is correct??

    Rob
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  5. #5
    slxrti
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    Hi Robb, was the crossover derived from the acoustical measurement of the driver?
    How did you determine driver spacing on the front baffle?

    thank's slxrti

  6. #6
    Administrator Robh3606's Avatar
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    Hello Slxtri

    What I have posted are the voltage drives that are based on 8 ohm loads using the L250ti Jubilee crossover that was posted a couple of years ago. The crossover is a clone of the standard with the exception of the Woofers lowpass and lower midranges bandpass. The woofer is active and the midrange bandpass is both active and passive. The passive secton was tweeked to keep the same drive as the all passive network. The other 2 sections are the same as the original networks.

    The driver spacing was based on the original speaker using photo's and a drawing posted that has the driver spacing from one edge and from the top/bottom of the cabinet.

    Rob
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  7. #7
    slxrti
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    Hi Robb, looking at the driver spacing I thought they may have been determine by the crossover freq, but I don’t think so

    I noticed a step in slope @ 1.2k do you know the purpose?

    slxrti

  8. #8
    Administrator Robh3606's Avatar
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    I noticed a step in slope @ 1.2k do you know the purpose?

    Hello slxrti

    To smooth the response. I have not powered anything up yet aside from impedance runs on the drivers. Attached is a link to an old thread where an in depth explanation is given for the network. It explains it better than I can.

    Rob

    http://www.audioheritage.org/vbullet...etwork+diagram

  9. #9
    slxrti
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    Hi Robb, interesting insight into crossover design. I'm sure quite a bit of effort was expended in its execution.

    Do you know which drivers are being used in you avatar?

    slxrti

  10. #10
    Administrator Robh3606's Avatar
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    Do you know which drivers are being used in you avatar?
    Sure do they are my 4344 Clones. 2235, 2122, 2425/2307 Aguaplased, 077's up top. They are biamped with a DX-1.

    Rob

  11. #11
    Administrator Robh3606's Avatar
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    Well I couldn't resist and droped drivers in one of them. I have them sealed now I have to paint them. Not sure how I will finish them at this point or exactly how I will do the tweeter bezels. Have to get the crossovers wired up and take them for a spin.

    Rob
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  12. #12
    slxrti
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    Quote Originally Posted by Robh3606 View Post
    Sure do they are my 4344 Clones. 2235, 2122, 2425/2307 Aguaplased, 077's up top. They are biamped with a DX-1.

    Rob
    They sure look nice, I thought about using the same drivers except for the horn/driver and a 2227 for a low end.

    How will do they image and how do they sound?

    Slxrti

  13. #13
    Administrator Robh3606's Avatar
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    They sure look nice, I thought about using the same drivers except for the horn/driver and a 2227 for a low end.
    Thanks, you planning on using a sub??

    How will do they image and how do they sound?
    Very nice they are definately keepers. They image OK not a lot of depth but are good side to side. Depends on what you want if imaging is very important then they may not be for you. They do alot of things right IMHO so they are a great reference speaker to have around and are fun to listen too.

    Rob

  14. #14
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    Quote Originally Posted by Robh3606 View Post
    Not sure how I will finish them at this point...
    If you don't mind black, Duratex is easy to apply, (with a roller), and good at covering up little things. 'Really rugged, too...

    John

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    Nice project Rob !

    I like your split cabinet approach .

    Are the 108H(s) store-bought originals / or / did you make them up ( starting with 2118s ) & using the aquaplas that you have on hand ?

    <>

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