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Thread: 4345 Clones

  1. #1
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    4345 Clones

    I'm quite inspired by the posts on the 4345 monitor and i'm going to take the plunge! I've read the threads but before I start cutting I have a few questions....

    Is the 4345 using a 2405H or 2405J? Is there a preference in terms of sonics? Is Charge-coupled 3145 crossover network (by Giskard) voiced for the 16 ohm or 8 ohm? Any differences?

    Should the front of the 2405 driver be flush with the baffle or have a slight relief?

    Are folks using 3/4" MDF for the panels/top or 1"? Is PB better?? How about the Baffle? Hardwood plywood or MDF?

    In the original 4345 production speaker, is the front baffle only secured via the rabbet-dado joints as depicted in the schematics, or is it also secured via screws to the 1 by 3 bracing?

    Thanks,
    Dave

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    Moderator / Treasurer/Marketplace Czar boputnam's Avatar
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    Quote Originally Posted by JBLOG View Post
    I'm quite inspired by the posts on the 4345 monitor and i'm going to take the plunge!
    Wow - cool for you...

    Quote Originally Posted by JBLOG View Post
    I've read the threads but before I start cutting I have a few questions....
    Uh-oh...

    Quote Originally Posted by JBLOG View Post
    Is the 4345 using a 2405H or 2405J?
    2405H

    Quote Originally Posted by JBLOG View Post
    Is there a preference in terms of sonics?
    Dunno - never tested A/B...

    Quote Originally Posted by JBLOG View Post
    Is Charge-coupled 3145 crossover network (by Giskard) voiced for the 16 ohm or 8 ohm?
    I believe it is "voiced" for the 2405H, 8Ω.

    Quote Originally Posted by JBLOG View Post
    Any differences?
    Possibly, but likely subtle at that band pass...?

    Quote Originally Posted by JBLOG View Post
    Should the front of the 2405 driver be flush with the baffle or have a slight relief?
    It is basically flush. Don't fret this - there are far more material time / phase issues unaddressed which work themselves out acoustically in a most pleasing manner...

    Quote Originally Posted by JBLOG View Post
    Are folks using 3/4" MDF for the panels/top or 1"? Is PB better?? How about the Baffle? Hardwood plywood or MDF?
    Panels are 1"; baffle is 3/4" ply (should double check all this with Rich Riessen's detailed work.

    Quote Originally Posted by JBLOG View Post
    In the original 4345 production speaker, is the front baffle only secured via the rabbit-dado joints as depicted in the schematics, or it it also secured via screws to the 1 by 3 bracing?
    There are no screws penetrating the baffle...
    bo

    "Indeed, not!!"

  3. #3
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    Bo thanks for the reply.
    Looks like Ian was using some screws to secure the baffle on his project but he might have been using butt joints to secure the baffle in his enclosure design...it was hard to tell from the thread.

    No screws in the baffle. Great! Makes my life a little easier.

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    Senior Member richluvsound's Avatar
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    reissens drawings

    Hi Blog,

    bo is the man ! Ricks drawings are brilliant ,do a search. I would suggest following them to the letter if you are not a joiner. I improvised on a few things. I used 1" MDF pre veneered board, MISTAKE . It looks fine , but with that much glue around I was lucky it did'nt get onto the veneer. I used splines on the mitres again,you need to have a pro workshop for this .
    If you can , have everything cut for you . FLAT PACK. You don't realise how big they are until you start to assemble them.

    cutting lists are a must.

    good luck and have fun

    Rich

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    Senior Member Ian Mackenzie's Avatar
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    Quote Originally Posted by JBLOG View Post
    Bo thanks for the reply.
    Looks like Ian was using some screws to secure the baffle on his project but he might have been using butt joints to secure the baffle in his enclosure design...it was hard to tell from the thread.

    No screws in the baffle. Great! Makes my life a little easier.
    Yeah,

    My project was moulded into a 4345 based on measurements from Bo. Originally there were no drawings..we had nothing so my exisiting box was heavily modified to fit the 4345 dimensions that we took from Bo's tape measurements. The baffles were the hard part and mine were bolted in over an earlier baffle opening for convenience.

    It was if you like the Momma 4345 clone and the basic drawings I did were later refined by Rick and others.

  6. #6
    Senior Member Guido's Avatar
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    Quote Originally Posted by JBLOG View Post
    Is the 4345 using a 2405H or 2405J? Is there a preference in terms of sonics? Is Charge-coupled 3145 crossover network (by Giskard) voiced for the 16 ohm or 8 ohm? Any differences?
    There is no 2405J.
    There is a 2405 (Alnico) and a 2405H (Ferrite). both use the D16R2405 dia.
    Both are more or less 7-11 ohms over the bandwidth.
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    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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    Thanks all!

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