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Thread: JBL 4345 CNC'd new build

  1. #1
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    JBL 4345 CNC'd new build

    Pristine components, making this new large build.

    Euro birch, with Oak finish (not yet stained).

    Kenrick Sound style stands in matching Oak.

    JBL blue is a challenge....this client wished for a brighter blue, Dulux Wingman Blue.

    Many many hours of work.

    Massive 3 way xover, with DSP active bass.

    Andrew
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    Additional pics with xover. DSP used for bass (Bryston amps).

    The pic with stands had the white ports before painting.

    Needing to do final sanding then "ye olde" bees wax finish.

    Andrew

    (PS, these available in CAD/CNC files, flat pack kits...world wide shipping.)
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  3. #3
    Senior Member Ian Mackenzie's Avatar
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    Nice work

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    Quote Originally Posted by Ian Mackenzie View Post
    Nice work
    Thanks Ian, a fun journey. I did not have all the gear to run multiple amps....but I did test the rig...wow, great output, lovely clean/tight sound.

  5. #5
    Senior Member just4kinks's Avatar
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    Please tell us more about your CNC setup. You stick plywood in one end and speakers pop out the other?

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    Quote Originally Posted by just4kinks View Post
    Please tell us more about your CNC setup. You stick plywood in one end and speakers pop out the other?
    Hi, I'm a little unsure of your comment, kindly.

    I used the JBL dims to CNC the original 19mm ply baffle. Then I added a further 3mm MDF baffle, which was glued onto the original ply baffle.

    I then "adjusted" the rear of the rear of the baffle by routering to ensure accurate depth of mounting the horns.

    Ideally, this should have been completed with the original ply baffle (which was painted in expensive two pack poly), but I made a mistake in mounting the tweeter. As such, the "original" baffle had four incorrect holes drilled. The client, naturally, was not happy.

    As such, I CNC'd a new front "skin" in 3mm MDF, then repainted in same two pack poly blue.

    All good.

    Does this answer your inquiry?

    Kindly

    Andrew

    (PS, with CNC, I now can offer all of the famous JBL monitors in CAD/CNC file, or kit form, or fully built.)
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    Nice work!

    I don't understand the need to add a 3mm MDF front to the baffle, when a 19mm baltic birch (3/4") is the spec.

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    Quote Originally Posted by DES-1 View Post
    Nice work!

    I don't understand the need to add a 3mm MDF front to the baffle, when a 19mm baltic birch (3/4") is the spec.
    Des, as I wrote below -

    ".....but I made a mistake in mounting the tweeter. As such, the "original" baffle had four incorrect holes drilled. The client, naturally, was not happy." Quite a lot of work to correct 4 small holes, but worth it in the long run.

    See the pic below with the speakers on the stands...look closely at the tweeters...the square bracket is incorrectly placed on the front of the baffle, not the rear...hence the additional screw holes in error.

    One good thing came of this, I drilled 4 magnets into the "original" baffle to support the grill frame (also with magnets). The 3mm MDF new skin then covered the hidden magnets....and is thin enough for them to work equally as strong.

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    Ah, OK, thanks for the explanation. Many would have just filled the holes filled the holes and adjusted cosmetics until undetectable. Your fix looks great though

  10. #10
    Senior Member gdmoore28's Avatar
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    Brilliant work, Atilsley! Those look great.

    GeeDeeEmm

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    Crossover

    Quote Originally Posted by gdmoore28 View Post
    Brilliant work, Atilsley! Those look great.

    GeeDeeEmm
    Great Job, I would like to know more about the crossover.

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    Bees wax added, grill frames built...hidden magnets (behind 3mm "front" baffle). I like the Oak veneer.
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    Pair polished.
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    That's a nice look, squared front and flush grill

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    Quote Originally Posted by DES-1 View Post
    That's a nice look, squared front and flush grill
    Thanks for your kind remarks.

    The front is not really 'square,'....the Oak trim is angled....but the photo doesn't show it up very well.

    I wasn't sure why the original grills needed to protrude so much...hence flush.
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