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homemade combo amp?

Discussion in 'Amps [BG]' started by newyorkiddo, Feb 25, 2014.

  1. newyorkiddo

    newyorkiddo Coffee Coffee Bassist Supporting Member

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    I'm tired of taking my SVT 3 Pro and cabinet back and forth between practices. I recently got a 12" inch, 4 ohm, 400 watt subwoofer from my friend. I do not know much about speakers or amps themselves, but I do know how to solder and read wiring diagrams, so I was wondering if it's possible to put this thing into an enclosure for a combo. If not, I can just design something and make it out of wood. Also, where would I get the preamp and all the other components for it? Help me. :confused:
  2. nashvillebill

    nashvillebill

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    The subwoofer would be a very poor choice for a bass guitar speaker, sorry.
  3. newyorkiddo

    newyorkiddo Coffee Coffee Bassist Supporting Member

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    Aw man. Maybe I'll trade it for some 10" speakers.
  4. BioWeapon

    BioWeapon

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    Subwoofers are quite inefficient. Really, really inefficient.
    You would need a lot more power than with a speaker designed for bass guitar application, to get the same volume. Subwoofers are also subject to the rule of two thirds - You can have two of these: Low, Loud, Small.
    That being said, if you're feeling adventurous and money is no object, you could build a cab with a mid driver too. High pass the signal before the amplifier. Get a compact high power solid state amp to power the cab.
    But it's still not a great idea. You'd be losing a lot over just buying a combo.

    EDIT: If you decide to trade for 10s, and you still want to make something, make sure they're full range speakers.
  5. noiseguy

    noiseguy

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    It will probably not sound great, but I'd build it anyways.

    My first "amp" was a Little Gem amp that I built from parts using a dead ghetto blaster as the case, speakers, and battery holder. Inefficient and horrible distortion... I love it, and learned a lot from the project.

    Schematic here http://www.runoffgroove.com/littlegem.html
  6. AstroSonic

    AstroSonic Supporting Member

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    If you like 'DIY' and have decent wood working skills consider buying a small micro (GK MB200 or similar) and a pair of Faital 10FE200 drivers - put them all in a nominal 2 cf box: amp in its own slot, drivers in a shared ported enclosure. Duratex exterior, handle and metal corners. Killer bass combo amp. Reduce cost by getting a 200-350w micro used.
  7. newyorkiddo

    newyorkiddo Coffee Coffee Bassist Supporting Member

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    I'll definitely do it, and if it sounds horrible, I'll try again. :D
  8. BioWeapon

    BioWeapon

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    Used? Not cheap enough!
    DIY amp or bust! ;)
  9. swamp_bass

    swamp_bass I love it when a groove comes together Supporting Member

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    What brand and type is the subwoofer, and how loud are your practice sessions?
  10. AstroSonic

    AstroSonic Supporting Member

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  11. fnordlyone

    fnordlyone Supporting Member

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    I own a Peavey Basic 112 combo that has a nice sounding pre and power amp that is easily detachable. I'm thinking of pulling it to make a 1x15 or 18 custom combo if/when I find a good deal. The only prob with Basic 112 is: the 12" speaker cab is fart city. If you're like me and try to make do with what you have… I still wouldn't use the sub. I'd find a full range woofer to build around and a used head from an old combo that sounds good pushing your cab (but not it's combo cab which = cheap 2nd hand).
    patience, and happy gassing,
    fnord!
  12. newyorkiddo

    newyorkiddo Coffee Coffee Bassist Supporting Member

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    Yeah, I'm giving up on that 12 inch. So now I've decided I will try it with 2 10" speakers and hopefully I'll make something alright.
    my practices aren't too loud. Electric drums are pretty cool haha. That's why I really see no point in taking an SVT to practice.
  13. will33

    will33

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    Disclosures:
    Use of this field for any other purpose is prohibited
    Per AstroSonics suggestion....the 8ohm FaitalPro 10FE200 is a very nice sealed cab speaker for bass guitar. This takes a lot of complications out of the design and build process. Their response curve is respectable in as little as 7/8ths cu.ft. net volume per driver, which means, you can basically build a 2cu.ft. (internal volume) box, stuff it generously with polyfill, and load the speakers in there. Align the speakers vertically (one directly on top the other), build a little "airhead" on top the cab to contain the amp and you're done. If you want to get fancy, you could put a slight tilt-back angle to the baffle, setting the top 1 to 1-1/2" back from where the bottom is. This would keep the mids and highs in your ear when you're standing just a few feet in front of the cab.

    They're very nice speakers and not expensive at all...I think about $53 each at UsSpeaker .com.

    Simple build, low cost, good sound.

    The 4 ohm version of the same driver (to result in an 8ohm 210) however is better suited to ported cabs.

    Your idea of a small amp (the MB200 watts @ 4ohms) and a pair of the 8ohm 10FE200's would make a very nice combo.
  14. BassmanPaul

    BassmanPaul Gold Supporting Member

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    My nephew gave me a 12" JBL car subwoofer. I know in my mind that a driver for a car does not work for a bass. My heart, however, still looks at the brute fondly. :)
  15. swamp_bass

    swamp_bass I love it when a groove comes together Supporting Member

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    If you already have the sub, and don't mind having a low volume cab that's thirsty for power, you could build yourself a nice little project with the addition of a $45 midrange and about $30 more in crossover components.

    Of course, that Faital Pro gives you full range straight out of the box without needing a crossover or mid, it costs less than the midrange and crossover parts would, and it will not require nearly as much amplifier power - which begs the question of why anyone would do such a thing.

    I did it. It was fun, and it was a learning experience. But I also have very specific tastes and perceived needs. ;)

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