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I built a bass cab with a 15 on top and an 18 on bottom

Discussion in 'Amps and Cabs [BG]' started by Codygx123, Sep 28, 2020.

  1. Codygx123


    Sep 28, 2020
    I need help with a crazy idea
    So I have this cab I built to house 2 speakers. A 15 inch, 4ohm 400watt 40DB low, and a 18 inch 4 ohm 400 watt 38DB low.
    I play a 5 string bass and want to basically send the lower frequencies of the low B to the 18 inch with a lower DB rating and the rest to the wider range 15.
    will a passive crossover solve all of the my problems? Or will it just work that way?
    I plan on wiring it in series.

    Attached Files:

    rollie 55, Erik Asma, Ric5 and 2 others like this.
  2. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, ChopShopAmps
    I'm not sure this is going to work out.

    I dont really have any specific instructions, but questions.... Are you sure those dB ratings you posted are correct?
    What speakers, again? Did you model them? Are they sharing airspace? Let's start there.
    BasturdBlaster likes this.
  3. BasturdBlaster

    BasturdBlaster Supporting Member

    Feb 19, 2012
    Crandon WI
    Yea, separate air space as a first!:thumbsup:
  4. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    I have no idea what you are talking about regarding your drivers.

    If you are using a crossover (or want to or think you want to), you can't wire them in series or parallel. Each driver would be fed from the output of the crossover.

    A passive crossover for the frequencies that MIGHT be useful is going to be both massive and expensive.

    It looks like you don't have any experience with this, based on what you have posted. How much money are you willing to waste?
    Altitude, Kaplan, MCF and 18 others like this.
  5. Codygx123


    Sep 28, 2020

    The are sharing air space, the are
    Wharfdale 224d
    as much as it takes to get what I want
    I’ve made speaker cabs before but this is the first time I’m doing something unconventional
  6. lz4005


    Oct 22, 2013
    dB is a measurement of volume, not frequency response.
    If you're using a crossover the speakers aren't in series or parallel.
    You have a lot of research to do before your project is even remotely possible.

    What are you hoping to accomplish? People abandoned the myth that you need an 18 to reproduce the lows of a B string over 20 years ago.
  7. Speakers ain't what they used to be. These days, bigger ones are usually louder. Without real in depth knowledge, that's about all you can count on.
  8. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Those Wharfedale model numbers are home hi-fi type cabinets and I don't see where you are getting an 18" and 15" from???

    What exactly are you talking about, I'm even more confused now than before.
  9. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    I'm not even sure that's true... all you can really say is that the bigger one is bigger.
  10. lug

    lug Supporting Member

    Feb 11, 2005
    League City, Tx

    This is all I need to know about speaker design!
  11. Redbrangus

    Redbrangus Supporting Member

    Nov 19, 2018
    Under The X In Texas
    You can't really get there from where you are. A simple high-pass filter could do the frequency-dividing part, but that can't be accomplished if the speakers are in series. Plus, as previously noted, the two drivers are sharing the same air space. Plus the drivers are home hi-fi speakers. You can't really get there from where you are.

    It does appear to be a nice enough piece of construction, though. Good job on that. :)
    musicman7722, Bassdirty, xbud and 2 others like this.
  12. Fair enough. I was assuming that within a given model range the larger ones would be larger in order to be louder. But I don't know that.
  13. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009
    on top of all the other reasons why this will probably not sound that good, if you did correctly use a real crossover between the two speakers, there would be no point in the top speaker being any bigger than like a 6" midrange driver
  14. lz4005


    Oct 22, 2013
    Which is exactly why you're supposed to finish the design before you begin construction.
  15. Back to the drawing board...………..
    MrLenny1 likes this.
  16. Omega Monkey

    Omega Monkey

    Mar 8, 2015
    DJ Bebop likes this.
  17. And I

    And I Supporting Member

    Feb 19, 2009
    Witchtown, MA
    If this were a "talk me out of doing this" thread i think you'd get a lot of helpful advice!

    Looks like a fun project, but... The way you are going about trying to reach your stated goal is not going to get you there, no matter how you wire it together. You've chosen the wrong speakers and built the wrong box. Not to mention the entire premise of your stated goal ignores the basics of psychoacoustics...
  18. tenor.gif

    He said, "How much money are you willing to waste?"
    db59, Claymore, S-Bigbottom and 7 others like this.
  19. IndelibleAccomplishedGyrfalcon-size_restricted.gif
    Omega Monkey likes this.
  20. Tim Skaggs

    Tim Skaggs

    Sep 28, 2002
    For the cabinet to be extraordinary, it would have to be the size of a troll’s house.
    DJ Bebop likes this.

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