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Thread: Mostly JBL Pro DIY 3-Way

  1. #46
    Senior Member NWCgrad's Avatar
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    In my measurement frenzy yesterday I measured the performance of my mains using a slightly modified PD6212/95 XO for the HF and MF drivers. This XO has a crossover point of 850 Hz per JBL, but we all know that point is the final XO that includes the natural roll off of the drivers. The XO measured very well, so I ordered all the parts to build two of them.

    I will be running all three front speakers as "two-way" using the dbx processor. Saves me three amp channels, but more importantly it allows me to manage all three speakers from the single dbx processor. The Peavey just lacks the DSP power to be of much use (only 5 PEQ/output).

  2. #47
    Senior Member NWCgrad's Avatar
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    Been busy with other projects.

    After dialing in the delay's to my mains with dbx I have no plans to run them passive.

    Final center channel concept:
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    Center will be 48" W x 28.25" H x 16.6" D, each JBL 2226H woofer is in its own enclosure (tuned to 40 Hz w/ a 6" Precision Sound port from Parts Express)

    Planned LCR Setup:
    Name:  LCR Setup.jpg
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    MF Unit: CMCD-82H on the PRX735 Midhorn
    HF Unit: 2453H-SL on the STX/VTX waveguide

  3. #48
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    Just curious, why dual 2226s as opposed to a single. If only for symmetry, why not something like dual 2206s?

    Seems like the box could be smaller, since a center doesn't require the LF extension.

  4. #49
    Senior Member NWCgrad's Avatar
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    Quote Originally Posted by emilime75 View Post
    Just curious, why dual 2226s as opposed to a single. If only for symmetry, why not something like dual 2206s?

    Seems like the box could be smaller, since a center doesn't require the LF extension.
    The dual 2226H's is purely for symmetry. I have three from my previous LCR setup, so I figured why not just go total overboard. I have a height restriction of 30" unless I want to go with an acoustically transparent screen. Which I actually do, but not until I move into a house with a better footprint for a theater.

    If I have an issue with destructive interference running dual woofers, I will likely add a big inductor to one to eliminate the interference.

  5. #50
    Senior Member NWCgrad's Avatar
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    Made some progress:









    This is going to be a very large center channel speaker.
    [/

  6. #51
    Senior Member maxwedge's Avatar
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    Thumbs up

    Nice build! How do you like the sound of the mid horn?
    I'm thinking of doing something like yours but not sure if I should do the horn or a direct radiating 10". I have a few 2251Js to use.

  7. #52
    Senior Member NWCgrad's Avatar
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    Thanks, I really like the sound. Excited to finish the center channel build. I listen to two channel audio about 75% of the time and the speakers are very dynamic and detailed.

    I don't have experience with the 10" drivers outside of the horn. I imagine they would still be pretty good.

  8. #53
    Senior Member maxwedge's Avatar
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    Thumbs up

    Thanks for the info!

  9. #54
    Senior Member NWCgrad's Avatar
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    Latest update, getting close to the finish line.

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  10. #55
    Senior Member NWCgrad's Avatar
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    New front triad:
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  11. #56
    Senior Member 1audiohack's Avatar
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    Man if that doesn't rock I don't know what would.

    Great work!

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  12. #57
    Senior Member NWCgrad's Avatar
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    Quote Originally Posted by 1audiohack View Post
    Man if that doesn't rock I don't know what would.

    Great work!

    Barry.
    Thanks Barry! I still need to do measurements to set the XO and DSP. Digital crossovers sure make speaker building fun.

    The mains do rock, but I think they particularly excel at acoustic music. Sounds almost live with the dynamics and lack of any distortion.

    I love your signature, a Biotechnology Program Manager at a large research instution (>$1B S&T budget) it hits the bullseye for our basic research programs.

  13. #58
    Senior Member srm51555's Avatar
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    Nice work!

  14. #59
    Senior Member NWCgrad's Avatar
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    Quote Originally Posted by srm51555 View Post
    Nice work!
    Thanks.

    I have done a basic setup of the XO. The Peavey VSX26 absolutely sucks compared to the DBX Venu360 loudspeaker management system. I need to start saving for a second DBX unit.

    Basic XO:
    LF: 40Hz, BW-18 - 300 hz LR-24
    Mid: 300 Hz, LR-24 - 900 Hz,
    HF: 900 Hz, LR-24 - 20 kHz, Flat

  15. #60
    Senior Member maxwedge's Avatar
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    Thumbs up

    Lookin' good!

    I have 3 of those Venu 360s and are a huge step up from the 260s that I was using. Sweet units!

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