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Thread: Some photos of my 4345 clones

  1. #76
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    Quote Originally Posted by maxwedge View Post
    I think their ugly!




























    NOT!!!!!!!!
    Nice work

    Dood, I was ready to drive to Concord and dump cold water on your head! That is, until I saw your bottom line.
    In.

  2. #77
    Senior Member maxwedge's Avatar
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    Thumbs up

    Quote Originally Posted by Titanium Dome View Post
    Dood, I was ready to drive to Concord and dump cold water on your head! That is, until I saw your bottom line.
    Watch out, I have quick reflexes and long arms!

    All joking aside, just4kinks project came out REALLY NICE!

  3. #78
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by maxwedge View Post
    I think their ugly!




























    NOT!!!!!!!!
    Nice work
    You are SO off my Christmas card list! (j/k, glad you like them)

    Quote Originally Posted by edgewound View Post
    I bet the crossovers mounted outside the box improves the performance a bit by cutting down vibration.
    I've been thinking about this comment, and I can't imagine how vibration would have any effect on resistors or capacitors. But it does seem that physical movement of an air-coil inductor through its own magnetic field would induce a distortion. I wonder if it would be measurable or audible.

    Quote Originally Posted by boputnam View Post

    I have not experienced the dip you described, and my networks are stock - so wiring is easy the OEM way.
    Interesting. I assume you are biamping? 4th order network?

    I'm suspicious that with your gorgeous networks and JBL's inverted polarity there is some unintended wiring snafu.
    Yes, that is very possible! Eventually I'll pull the woofer and check everything, but right now I'd rather just listen to them.

  4. #79
    Moderator / Treasurer/Marketplace Czar boputnam's Avatar
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    Quote Originally Posted by just4kinks View Post
    Interesting. I assume you are biamping? 4th order network?
    Yeah, per my pm a few weeks back. Bryston 10B LR, custom, using for the 4345 crossover point but 4th-order slope. It really tightened-up the low-end. The 2245 is such a wonderfully tonal, low Q woofer, it's nice to leave it on it's own as much as possible.

    Quote Originally Posted by just4kinks View Post
    ...right now I'd rather just listen to them.
    I second that!
    bo

    "Indeed, not!!"

  5. #80
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by boputnam View Post
    Yeah, per my pm a few weeks back. Bryston 10B LR, custom, using for the 4345 crossover point but 4th-order slope. It really tightened-up the low-end. The 2245 is such a wonderfully tonal, low Q woofer, it's nice to leave it on it's own as much as possible.
    Cool. I wasn't sure if that was just a suggestion or something that you are using yourself as well. I think this will be my next project, the amplifier can wait.

  6. #81
    Moderator / Treasurer/Marketplace Czar boputnam's Avatar
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    Quote Originally Posted by just4kinks View Post
    I think this will be my next project...
    IMO, excellent priority particularly wrt your beautious DIY crossover. Yum...
    bo

    "Indeed, not!!"

  7. #82
    Senior Member just4kinks's Avatar
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    The 4345's are pretty much done, but I've been keeping myself busy working on this active crossover. It's coming along nicely, all that's really left is to drill the mounting holes in the chassis.

    The design is pretty simple, pretty much straight out of Douglas Self's "The Design of Active Crossovers". I did the circuit / board design myself and I had the boards printed by BatchPCB. I'm working on a discrete version, but of course that is a much bigger project and who knows when it will be done.

    Specs:
    - 4th order Linkwitz Riley
    - 290Hz fixed crossover point
    - Active balanced I/O
    - High tolerance metalized polypropylene film filter caps, metal film resistors, 5532 opamps




  8. #83
    Senior Member Amnes's Avatar
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    My goodness, that x-over looks lovely! I have a set of similar 4th order opamp pcb's on the shelf - need to solder them up too. In the long run my aim is also to end up with a discrete design x-over.
    Do you have any knowledge of an existing diy kit or at least some online documentation of a completed project? Designing one is out of my leauge. I know brystons are fully discrete, and Pass too, but buying a xover thats more expensive than my amps would be a bit of a misalliance. Anyway If you end up finishing the discrete design I'm sure you'd find many LH members interested as well as other loudspeaker diy nuts to be found on boards across the world.

  9. #84
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    For discrete active crossover which is very similar to Pass XVR1 you can check here:
    http://www.diyaudio.com/forums/analo...crossover.html

  10. #85
    Senior Member just4kinks's Avatar
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    The meat of the discrete project is designing an opamp. I was thinking it would be cool to design it so that the whole board can plug into a standard DIP8 opamp socket, using the same pinout as the 5532. Then I will upgrade the opamps in my cd player, receiver, equalizer, and so on, and I'll have a fully discrete signal chain without spending kilobucks. And it sounds like just what you're looking for, as an upgrade for your opamp crossover kit.

    But I'm not going to make any promises until I at least have a working prototype

  11. #86
    Senior Member Amnes's Avatar
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    So you are aiming towards designing dual discrete opamps and plugging them into your boards? Is that nearly everything that differents a discrete design from integrated op-amped?

  12. #87
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    Quote Originally Posted by just4kinks View Post
    The meat of the discrete project is designing an opamp. I was thinking it would be cool to design it so that the whole board can plug into a standard DIP8 opamp socket, using the same pinout as the 5532. Then I will upgrade the opamps in my cd player, receiver, equalizer, and so on, and I'll have a fully discrete signal chain without spending kilobucks. And it sounds like just what you're looking for, as an upgrade for your opamp crossover kit.

    But I'm not going to make any promises until I at least have a working prototype
    something like this?
    Name:  487444463_o.jpg
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Size:  37.7 KB

  13. #88
    Senior Member just4kinks's Avatar
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    Quote Originally Posted by neskor View Post
    something like this?
    Attachment 55885
    Yeah. It's not easy to have an idea that someone else hasn't had already . I'm hoping I can make mine a bit smaller than those.

    Quote Originally Posted by Amnes View Post
    So you are aiming towards designing dual discrete opamps and plugging them into your boards? Is that nearly everything that differents a discrete design from integrated op-amped?
    Discrete designs usually use higher rail voltages as well.

  14. #89
    Senior Member just4kinks's Avatar
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    The crossover is done!

    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.

    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. 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.

    So what's next? The discrete op-amp, power amps, or maybe back to the wood shop for a matching birch rack / tv table.




  15. #90
    Heather [Senorita member] hjames's Avatar
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    Your work looks very nice - small, modular and straight-forward.
    Nice cabinet too!
    2ch - Oppo981, JoLida502, JBL L200+, KEF 105.4
    HT7- XDA-2, BDP93, 4b NRB, B&K 5ch amp, Vandy 3A, 2Ce, VCC1, TF600 & JBL 4641

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