"Non build thread" build thread, what? 4x8

Discussion in 'Amps and Cabs [BG]' started by basscooker, May 21, 2018.


  1. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, ChopShopAmps
    Fun 4x8. I prototyped one up, and it is really fantastic. I'm not adding it to my products. For the same approximate size and weight (63 lbs) it can be out-performed at a similar or lower price than I could list them for. Still a good cost/performance ratio as a DIY though, so I figured I'd just give it to the community as another basis for a fun project.

    The important stuff:
    Approx 3.0 cuft, tune to 52. My box is roughly 3.6 cuft unloaded. Ports are 3", cut to 2.5 deep.

    Woofer
    http://www.newark.com/mcm-audio-select/55-2960/woofer-8-die-cast-professional/dp/13T7692

    Mids
    "Goldwood GM-65/4 Sealed Back 5-1/4" Midrange 4 Ohm" from www.parts-express.com!

    Cap
    "Dayton Audio DMPC-6.8 6.8uF 250V Polypropylene Capacitor" from www.parts-express.com!

    Coil
    "Jantzen Audio 0.25mH 15 AWG Air Core Inductor Crossover Coil" from www.parts-express.com!

    Wire woofers series/parallel for 8 ohm.

    Run the mids in series for 8 ohms, and reverse polarity from the filter.

    I added an l-pad, edge casters on the bottom, and a bar handle to mine. The one I made measures OAD not including feet 37 3/4" high, 17 3/4" wide, 11 1/4" deep. I used 1/2" ply. The baffle is set back 3/4" , and is mounted to cleats as well as the edges.

    The rest is up to you! Shape, baffle configuration, whatever.

    -3 is about 46, -6 is about 41. Woofer rolls off gently about 3dB between 1k and 4.5k , mids come in around 4k.

    WP_20170504_20_14_19_Pro.jpg WP_20160619_22_45_10_Pro.jpg WP_20160615_18_00_22_Pro.jpg 20180521_121335.jpg

    Enjoy, and note that the woofers actually do fairly well on their own. You can get pretty awesome results without the filter and mid range drivers. It is only -3 @ 4.5k.
     
    Last edited: May 21, 2018
    BadExample and BasturdBlaster like this.
  2. Jack

    Jack

    Sep 6, 2003
    Northumberland, UK
    I'm always so tempted by this kind of stuff, but the US prices don't translate over here. For once though, that 8" driver is $15 and £15!

    Hmmm, I'd fancy a pair of 8R 2x8" cabs...
     
  3. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, ChopShopAmps
    Alas, this woofer has no 4 or 16 ohm equivalent. Which reminds me to edit the OP...
     
  4. Jack

    Jack

    Sep 6, 2003
    Northumberland, UK
    D'oh, was sure it was 4R when I clicked on the specs...

    By the time I've built a 4x8" we're pretty close to the size and weight of my 'big' cabs so that's a downer.
     
  5. Al Kraft

    Al Kraft Supporting Member

    May 2, 2016
    Northern Virginia
    That's a nice looking cab. :thumbsup:
     
    BadExample and basscooker like this.
  6. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
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