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Thread: Some photos of my 4345 clones

  1. #91
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    Yeah, where did you get the little enclosure for the crossover?

  2. #92
    Moderator / Treasurer/Marketplace Czar boputnam's Avatar
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    Quote Originally Posted by just4kinks View Post
    The crossover is done!


    Quote Originally Posted by just4kinks View Post
    It is a noticeable upgrade from the m552. Midbass is more defined, bass and drums are sharper and clearer. Also there seems to be a bit more resolution in the highs.
    Excellent. And, your observation is consistent with my urging, although that included you consider a Bryston 10B L-R. I never contemplated you'd build your own! But that's all you, Joe!

    Quote Originally Posted by just4kinks View Post
    It went together pretty much as planned. I messed up the gain structure, and I'm stuck with +6dB gain - I can fix it, but I'll have to order more parts.
    I'm curious about the error...

    Quote Originally Posted by just4kinks View Post
    Also there was a defect in one of the PCB's copper layers, causing a short between traces. It was frustrating to track down - next time I need to inspect the boards more thoroughly before assembly.
    How'd you find it with everything still soldered to the PCB's? Compared one to the other...?

    Quote Originally Posted by just4kinks View Post
    So what's next? The discrete op-amp, power amps, or maybe back to the wood shop for a matching birch rack / tv table.
    Smaart...?
    bo

    "Indeed, not!!"

  3. #93
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by hjames View Post
    Your work looks very nice - small, modular and straight-forward.
    Nice cabinet too!
    Thanks!

    Quote Originally Posted by JeffW View Post
    Yeah, where did you get the little enclosure for the crossover?
    http://www.par-metal.com/

    Their enclosures are really nice! Thick anodized front face, variety of sizes, and good prices.

    Quote Originally Posted by boputnam View Post
    I'm curious about the error...
    Basically, the balanced output buffer is doubling the amplitude of the signal. At some point I had realized it would be a problem, but I forgot to correct for it until it was too late.

    How'd you find it with everything still soldered to the PCB's? Compared one to the other...?
    Luckily the short was on the bottom! It still took a while to find, at first I thought it was a faulty component and I clipped a bunch of them out.

    Smaart...?
    Yes! I have some ideas I want to run by you, when the time comes.

  4. #94
    Senior Member Amnes's Avatar
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    Lemme guess: 100nf + 3.92k? What a gem. When I grow up I want to be just as talented knowledgeable and resourcefull as just4kinks. Fabbing up proper quality products on your own is a great way of life. I'm holding my breath till you fire up the discrete balanced crossover. I'm sure it'll be a work of art. I'll hopefully be firing my 24db@340Hz single ended opamp crossover tomorrow - really similar desing to what you fabbed up. Hopefully it too will work some magic in the overall feel of my clones.

  5. #95
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by Amnes View Post
    Lemme guess: 100nf + 3.92k?
    exactly! With 1% metal film resistors, and 1% mkp1837 (polypropylene metallized film) caps.

    What a gem. When I grow up I want to be just as talented knowledgeable and resourcefull as just4kinks. Fabbing up proper quality products on your own is a great way of life. I'm holding my breath till you fire up the discrete balanced crossover. I'm sure it'll be a work of art.
    It's not talent and resource, it's just excessive free time! Besides, you have already proven your skills with your own beautiful clone project.

    I'll hopefully be firing my 24db@340Hz single ended opamp crossover tomorrow - really similar desing to what you fabbed up. Hopefully it too will work some magic in the overall feel of my clones.
    post some pics! I want to see your handiwork.

  6. #96
    Senior Member Amnes's Avatar
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    My clone project required me nearly only to solder the passive crossover and screw in the drivers - not too much work at all. Carpentry is an art, ordering cabs is not.

  7. #97
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by just4kinks View Post
    I'm working on a discrete version, but of course that is a much bigger project and who knows when it will be done.
    A couple of you have asked, and I finally have some progress to post: my discrete crossover is almost done!

    I spent a lot of time earlier this year developing my discrete op-amp. It is completely BJT-based, with a class-A output stage. I probably won't make a plug-in version after all, there would be too many compromises and it's too hard to guarantee stability. So far I have designed a balanced I/O board and a Linkwitz-Riley filter board. Next will be a parametric filter board, and then an attenuator module.

    This crossover uses the same basic circuit as the 5532 version I posted before. I added a couple tweaks, like muting relays and a provision for a gain control pot, although gain and frequency are still fixed, tuned for the 4345. I plugged it in to my system for this first time this weekend. It's a bit premature to describe how it sounds, I have to make some more tweaks and then I'll A/B test it against my 5532 version.

    Pics:



  8. #98
    Senior Member bigyank's Avatar
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    Damn! Looking very good. Great workmanship too. Well done!
    Basement: JBL SVA-1800 and 2226H DIY Enclosures Computer room: Control-5:Control SB-2 Living room: JBL 240ti

  9. #99
    Senior Member Amnes's Avatar
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    I highly second the DAMN! Discrete analog crossover = pureness.

  10. #100
    Senior Member Guido's Avatar
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    DAMN DAMN
    A discrete active crossover... Wow, great and simply stunning work!
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

  11. #101
    Junior Member tjnif's Avatar
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    will you be selling it?

  12. #102
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by tjnif View Post
    will you be selling it?
    Yes, eventually! But this is still just a prototype. I have bugs to work out, and as it is now the cost would be way too high.

    Now I just need some time to work on it...

  13. #103
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    Wow. These are exceptional. Excellent attention to detail, and I love that you chose to finish them natural to bring out that beautiful ply.

  14. #104
    Senior Member Guido's Avatar
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    You could just sell the pcb's for the start.
    Some of us would be able to work with it.

    Oh, and a sketch of schematic for it.

    That would be
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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