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fEarful™ 12/6 & 15/6 enclosure designs - FREE!

Discussion in 'Amps and Cabs [BG]' started by greenboy, Jan 21, 2009.


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  1. Anyone? Plz?
     
  2. zac2944

    zac2944

    Dec 28, 2004
    Rochester, NY
    Depends on what you like in your bass cab? Do you slap much? Try low passing a bass signal at 7-10kHz; do you still like what you hear? That's the stuff you'll be missing without a tweeter. I don't think most folks would notice the difference.

    This has been mentioned before in this thread. Look at the Eminence crossovers. Going to a mid at 800Hz should work for you. The Em crossover won't be as nice as one designed specifically for your cab, but it might be good enough for you.

    If you want to give it a try: http://www.diyaudioandvideo.com/FAQ/XOver/

    Can't help you with GB's specs on the design, but you'll be able to get something very close using WinISD. Try starting around 1.75ft^3 tuned to 45-50Hz.

    If you keep the volume and tuning the same the differences should be slight. I guess you'll get a change in edge effects from the baffle size change, but I don't think it is anything you should worry about.
     
  3. Thanks!
     
  4. I'm still tossing around the idea of getting an Avatar SB112, if I can get it preloaded with a 3012LF from Avatar, and then opening up the tweeter cutout for a midrange. Of course, the crossover would have to be redone.

    I'm still waiting to hear from Dave. He probably won't be able to do the driver swap, but it's worth asking.

    I like the idea of standing the SB112 on end so the port is at the bottom, in the skinny tall orientation. If one works out well, I might do another one.

    You guys who run the table saws and build cabs from scratch have more pluck than I! I know I can run a hole saw, at least.
     
  5. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    hey,

    i was wondering about the perceived loudness of that particular cabinet since the driver has a sensitivity of "only" 95.5.
    will it be noticeably less loud compared to speakers with a sensitivity of 100 if driven with the same wattage?

    thanks
     
  6. zac2944

    zac2944

    Dec 28, 2004
    Rochester, NY
    Yes, but SPL alone doesn't tell the whole story.

    Most likely that 100 SPL driver will be louder a low levels, but when you're pumping 300W-400W of low end the 100 SPL driver will be farting out while the 95.5 SPL 3012LF will still have nice tight and undistorted low end. The 3012's xmax allows it to be run to full thermal power, where a driver like the 2512 cannot be run full out before hitting xmax.

    I'm GB and other can give you more insight into this case. Let's see what they have to say.
     
  7. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    hey that's interesting and makes sense to me thanks.

    with how many watts would you ideally drive one fearful12 cab?
     
  8. zac2944

    zac2944

    Dec 28, 2004
    Rochester, NY
    Tough to say exactly. The 3012LF is rated for 450W thermal and should be able to hit that before xmax depending on how the box is tuned. Crossed over to a mid like the 18sound at 800HZ, you should be able to run 500W-600W per cab before maxing anything out. Might even be able to go a little further. A lot depends on the signal. If you're bumping your low eq you'll find trouble sooner.
     
  9. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    thanks, sounds good. now we just have to wait for the final specs...
    any updates GB?
     
  10. greenboy

    greenboy

    Dec 18, 2000
    remote mountain cabin Montana
    greenboy designs: fEARful, bassic, dually, crazy88 etc
    Sorry to take so long, folks, but family matters have come up. But now I have a finalized size and tuning. Panels, bracing, midrange chamber, and other details seem to be crosschecked and frozen. Still need to find time to draw a Detail sheet for how bracing is made and fit together, and overlay all the dimesnions/measurements. I'll get it all up as soon as I find time.

    This version is taller, can be used on its side as a monitor on a Markbass angle prop or simple, small hinged cradle. In spite of being narrower, its midrange driver and optional tweeter will line up perfectly with another 12/6 fEarful or a 15/6 fEarful when stacked.

    [​IMG]
     
  11. Blues Cat

    Blues Cat Supporting Member

    May 28, 2005
    Katy, Tx
    GB are you going to be selling these? I'd definitely give it consideration.
     
  12. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    awesome thanks alot for your effort greenboy, appreciate it.

    stupid question maybe but i haven't figured out yet what the small holes in the bracings are for?
     
  13. asad137

    asad137

    Jan 18, 2007
    Minneapolis
    Physicist
    Just to save weight.

    Asad
     
  14. greenboy

    greenboy

    Dec 18, 2000
    remote mountain cabin Montana
    greenboy designs: fEARful, bassic, dually, crazy88 etc
    I put the fEarful™ plans out for DIYers because what was out there when I decided to get a new cab with flatter extended response and high SPL capabilities didn't exist. I figured private individuals could benefit from modern FREE plans for something beyond the mundane, ones that were also relatively simple to build. But I don't want to build cabs for others. I actually hate the time and tools it takes to go into accurate mass production. I don't want to find COMMERCIAL ENTERPRISES glomming on without my involvement either, but I suppose if good design in the bass cab market ever catches on there will be more imitators.

    So. I suggest that the unmotivated might find a local fine cabinetry specialist or finish carpenter (considering the economic outlook they would appreciate the work!) and go with that. For others, this should be fun and actually deliver something that won't need to be shifted later.

    As I was saying... Bass cabs that came close were a bit too small to totally use the better woofer potential that was available, and tuned too high and none had room for a good small format midrange cone and had that stupid squat/wide profile that makes it tough to use just one on small stages and actually hear the midrange. I had contacted Dr Bass but they had no interest in a 2-way or 3-way at that time. Amazing how later they were... but I'm not too impressed by some of the design and component choices. What they have looks similar but it's not all there.

    But just as I was about to give up on buying and began motivating myself to build what I had on paper, I saw that Carvin had just released a club PA cab, the LS1503. So I bought it to tide me over; it looked like it was a close relative to my concept. I gigged with it and used it as a test bed. It turned out to be a remarkable cab, though a little too small to fully allow the best woofers to reach low smoothly.
     
    RJC1811 likes this.
  15. greenboy

    greenboy

    Dec 18, 2000
    remote mountain cabin Montana
    greenboy designs: fEARful, bassic, dually, crazy88 etc
    Yeah, you can save 25-33% weight {yes, I did the math;}. This allows you to actually have enough bracing to really control the soak of vibration from those high-force woofers. No sense in muddying up the response and lossing more energy than one has to. But no sense in making it weigh too much, either.
     
  16. greenboy

    greenboy

    Dec 18, 2000
    remote mountain cabin Montana
    greenboy designs: fEARful, bassic, dually, crazy88 etc
    Cut two pieces of plywood into triangles at whatever angle suits you, cut the sharp tips off, and attach to a hinge in between them. Now you have a wedge/cradle to open up and put under a fEarful sitting on its side, for tiltback monitor placement. Put hinge even with front baffle for less angle, further back for steeper. Aircraft drill for even less weight.

    [​IMG]
     
  17. Supertanker

    Supertanker Watch the dog! He is trained to bite!

    Jun 23, 2005
    CinCinNati
    I just read the whole thread, guess I'm a little late to the party...

    Good stuff, as always...
     
  18. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    yeah, can't wait for the final specs.
    i might try building one but it's a big enterprise for me as i have only built two cabs so far. who else is thinking about it?
    i gotta see how it compares to commercial cabs.
     
  19. Well, I still say that building this or the fEarful 15 with a 2-space rack at the top would make a killer combo amp.
     
  20. Colonel_Claypoo

    Colonel_Claypoo Steve Harris nut

    Oct 24, 2007
    Germany
    by the way, has anybody ever built a fearful 15 and can comment on the performance? i couldn't find any people here who did it...
     



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