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Want to make homebrew sub.

Discussion in 'Home Cinema Building DIY' started by Hysteria, Jun 14, 2004.

  1. Hysteria

    Hysteria
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    Hi, i'm realy geting in to the idea of making my own active sub. I have no idea where to start, can you guys find me a guide or somthing?.
     
  2. eviljohn2

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  3. Hysteria

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    Achualy lemi get streight to the point of what i'm stuck on. I'm a real newb to all this stuff. It's just I have no idea what a crossover is.
     
  4. eviljohn2

    eviljohn2
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    The crossover is the filter network built into practically all speakers.

    It sends the high frequencies to the tweeter, mid/low frequencies to the relevant driver and in the case of a sub, eliminates all but the bass frequencies.

    In the case of a sub, they have variable frequency cut-off which enables you to change how high the frequencies are that get to it.
     
  5. eviljohn2

    eviljohn2
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  6. Hysteria

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    Ah rite thanks. So if my reciever does all of the crosovering I won't need one in the sub?.
     
  7. eviljohn2

    eviljohn2
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    Technically no, but they can be useful for helping integrate the sub with your room and speakers. My receiver does all the crossover stuff for me but they're almost always built into the amp panel anyway if you get a dedicated sub amplifier.
     
  8. Hysteria

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    Ah rite ta. I'll have a look at some drivers, amps, and crossovers and report back to see what you guys think. One last thing would a 100w amp be able to drive a 300w driver effectively?.
     
  9. eviljohn2

    eviljohn2
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    That depends on lots of factors I'm afraid, enclosure size and type, driver type etc.

    Retro and Shinobiwan know much more about this than me so I'm sure they'll input something soon :smashin:
     
  10. Hysteria

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    Ok cool, What you recon's a good entry level freq range for a sub?.
     
  11. Hysteria

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    Ok, I was just wondering this Sonatube looks like such a great design. I was thinking the sonatube would sound better as opposed to a regular cube shape housing?.
     
  12. ShinObiWAN

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    I have yet to find a supplier of sonotube in the UK and shipping from the US turned out to be *very* expensive. So I never bought any in the end.

    If anyone else knows a UK supplier of sonotube or similar please speak up.

    I'd recommend that you start off with these components:

    The BK electronics 100w sub panel here.
    This includes all the relevant controls such as level, cut off frequency, phase as well as low and high level inputs. The amp comes complete with power lead, phono cable (for connection to the sub out on your amp) and high level cable (for connection to the speaker terminals on your amp)

    and

    A BK 12" subwoofer here.

    I built one of these not so long ago and was very pleased with the performance I got for only £150 plus around £12 worth of MDF and some spray paint.

    You can take a look at what I ended up with when I finished here.

    For lots more info on this design see these very good threads:

    http://www.avforums.com/forums/showthread.php?t=111293&highlight=BSB

    http://www.avforums.com/forums/showthread.php?t=80479&highlight=BSB

    Both of these inspired my sub woofer which is shown above.
     
  13. Hysteria

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    What do you think of using one of the omp mf range amps and the crossover from BK's. I was thinking this because there two seperate parts so I can upgrade them later http://www.bkelec.com/DIY.htm
     
  14. Mat-Moo

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    http://www.essextubes.co.uk sell all that I believe.

    Kinda tempted myself to look at this :)
     
  15. GaryG

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    If it's of interest to you I still have the stuff listed here:

    http://www.avforums.com/forums/showthread.php?t=84149

    I also have a suitable sonotube, 16" x 39" to put them in, all you would need to do is build the thing!

    If you're able to collect I'll do the whole lot for £250.
     
  16. Hysteria

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    Sorry mate can't do, thank you for the offer though.
     
  17. IronGiant

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    Must ... lock.. up.. wallet....
    That is soooo tempting. Unfortunately my marriage is more important to me :rotfl:

    Dave
     
  18. GaryG

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    Hysteria

    Good luck with the project, I don't want to read that you 'copped out' and bought a commercial sub! You will most likely move on from your first sub quite quickly as you understand more about what you are doing, I'm on something like my sixth one now and finally have something that I'm happy with.

    Regmarch

    A marriage is much more important than bone-crushing, accurate, super-fast bass that resonates your internal organs! :D
     
  19. Hysteria

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    Thanks Gary, don't worry about me copping out, I can't aford to lol. What I realy want to do is make the cabinate so perfictly the first time, I can just upgrade the components later on.
     
  20. IronGiant

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    Aah if only...

    My RELinquished build was a fascinating project that has left me with a taste for more, I'd love to build one of those tubes.

    But new babes need new bedrooms, and I'm rearranging internal walls to make space and get the kids rooms further away from the home cinema. An even better sub is an elusive dream at the moment.

    Dave

    PS Stay in touch if you don't sell... :D
     
  21. slingshot

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  22. Hysteria

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    This sonatube is basically a cardboard cylinder?, If so what's the tonal quality of it like?. Wouldn't it be better to build something a little more conventional out of a decent wood like mahogany?.
     
  23. IronGiant

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    MDF is basically cardboard...

    Dave
     
  24. GaryG

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  25. Hysteria

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    Nice one Garry :thumbsup:
     
  26. Mat-Moo

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    Those sonotubes look nice anyone wanna buy my sub so I can get the bits off Gary! :)
     

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