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New 2X12 Cabinet Build

Discussion in 'Cabinets & Speakers' started by David Copeland, Sep 24, 2021.

  1. David Copeland

    David Copeland Member

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    I recently got a couple of Cerwin Vega ER124 speakers off eBay so of course I had to build a cabinet for them. This one was going to be 3/4" pine board with 1/2" ply front and back baffles. I was also going to figure a tuned port on the rear baffle. Well here are the pictures:
    IMG_20210909_203106r1.1.jpg IMG_20210909_204758r1.1.jpg IMG_20210913_202249r1.1.jpg IMG_20210916_101113r1.1.jpg IMG_20210923_115104r1.1.jpg IMG_20210924_095345r1.1.jpg IMG_20210924_095504r1.1.jpg
     

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  2. PelliX

    PelliX Well-Known Member

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    I like the Strat jack socket on the back - cool. Maybe add your own 'brandname' somewhere on the front baffle? :)
     
  3. pedecamp

    pedecamp Well-Known Member

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    Interesting design with the opening at the bottom of the back. Did you test what it sounded like with the opening and without?
     
  4. David Copeland

    David Copeland Member

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    No, actually, I measured the T/S parameters on the two speakers and did a tuned port design that resonates the box/speaker combination at approximately 71Hz for one speaker, 67 Hz for the other (difference in the T/S parameters), which is just a bit below standard tuning for the guitar low E string. The slot you see at the bottom is the size port called for to make this happen. Playing a bass on the low E string and walking down from the 12th fret you can hear where the cabinet/speaker unloads and stops producing the fundamental tone. Using a sealed box will only raise the resonant frequency which will cut off the speakers low end at a rate of about 12 db per octave. But I didn't do a sealed box design to see exactly where that would happen. Just it would be higher than the ported design for the same box size.
     
    Last edited: Sep 24, 2021
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  5. David Copeland

    David Copeland Member

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    The Strat jack plate takes up way too much space on a guitar IMO; but for a speaker cab where there's lots of room I like it since it doesn't stress the cable or the phone plug pointing down like that. And yes, I'll probably add one of my logos to the cab just as I have on the amp.
     
    Last edited: Sep 24, 2021
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  6. Johan

    Johan Member

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    Beautiful woodwork, but IMO the cab would look soooo much better with a nice grill cloth instead of the bare black baffle and metal speaker covers.
     
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  7. David Copeland

    David Copeland Member

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    It probably would, and I may well do that in the future. I just haven't gotten around to it at this point. But your comment does beg the question; what grill cloth style would work best with this? Salt and pepper, some sort of light tan, basket weave?
     
  8. David Copeland

    David Copeland Member

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    BTW, I really like the way these sound.
     
  9. Dogs of Doom

    Dogs of Doom >>> Moderator <<< Staff Member

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    or, you could get a full face metal grill custom made...
     
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  10. fitz288

    fitz288 Well-Known Yinzer Silver Supporting Member

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    I used a similar speaker grill on my MG15 micro cabs build.
    The baffle plates are made from OSB and covered with a thin sheet of black ABS plastic that has a textured surface.
    I used an adhesive between the two, but it's also held in place by the face frame and the speaker grills.
    Not a grill cloth, and a nice covering to hide the OSB.

    MG4.jpg MG10.jpg
     
  11. Johan

    Johan Member

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    I’m a sucker for Marshall large check, but on this cab I think Vox diamonds would look fantastic.
     
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  12. Dogs of Doom

    Dogs of Doom >>> Moderator <<< Staff Member

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    I was on my way out, when I posted this. I ordered my grill from here:

    https://www.reliablehardware.com/customspeakergrill.aspx

    I ordered black expanded metal. I had the edges bent (all 4 sides) inward towards the cab. Then you order a dense, black rubber spacer tube w/ screws & washers to install the grill...

    On mine, I did a 1" bend, the depth of the cab face is deeper than that, but, there are braces, that are just about 1" deep.

    PAUL1348 copy.jpg
     
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  13. PelliX

    PelliX Well-Known Member

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    I really like @Dogs of Doom 's idea with the metal front, but the VOX diamonds... would be the winner for me. :applause:
     
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  14. Geeze

    Geeze Well-Known Member

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    Nice looking cab! I really like the clear finish on the pine - lacquer or other?

    Regards,

    Russ
     
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  15. David Copeland

    David Copeland Member

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    Thank you! Actually the finish is several coats of wipe on poly. While it's somewhat time consuming it doesn't require a whole lot of effort.
     
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