My first DIY sub build

Discussion in 'DIY Speaker & Subwoofer Building' started by AndyH76, Jul 13, 2017.

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  1. AndyH76

    AndyH76
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    After a lot of research and head scratching I've decided to take the plunge and go DIY, I currently have a Monolith + behind an at screen in a dedicated room measuring 17' x 9'.

    The plan is to keep the sub behind the screen but to make more room so I'm not limited by space for the cabinet. I built a solid plasterboard wall when I first made the room with a small opening inside which I housed my equipment but I soon tired of this and hid it all behind the wall, this now leaves me with a large space for the new sub.

    I like the look of the Dayton Audio UM18-22 18" for the driver but I'm not yet decided on sealed or ported cabinet, the space I will have to play with is 105cm W x 50 D x 150 H.

    I have had a quick play with WinISD and it seems it should be able to accommodate either design.

    I know there is a lot of knowledgeable people on these forums and hopefully with your help I'll get a decent end result (fingers crossed).
    As It's my first build I think I'll contact gordy on ebay for the cabinet cuts as it will be my first attempt and have I a limited tool selection!
     

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  2. MemX

    MemX
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    What is your budget?
    Listening volume? (And expectations?)
    Are you looking for flat-to-5Hz?
     
  3. AndyH76

    AndyH76
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    I'm hoping to come in at around £600 to £800 mark but I have no measuring equipment yet so I may keep that separate.

    If I'm listening alone I can go sub -10 but as most of the time swmbo is in with me it's usually around the -12 to -15 mark.

    I can honestly say I'm a set and stick member who loves watching movies, I'm not sure I can dedicate as much time or money as some of the avid bass junkies ;) who frequent the diy section.
    As I said in my first post I've been more than happy with the monolith for a few years but never felt it gives me that chest pump feeling that so many members mention.

    I'm sure I'll be more than happy with flat to 15hz if achievable I my budget.

    I'll get some more accurate room measurements later and start cutting into my false wall to free up some space.

    All help and guidance is much appreciated...:thumbsup:
     
  4. mattkhan

    mattkhan
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    750L external volume is a very big space, to give some examples it is bigger than a skhorn (680L external) or a captivator 4000 (560L).

    Build an LLT to fill gap and away you go :)
     
  5. mattkhan

    mattkhan
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    If you make it yourself, I suppose £1-200 on sheets of MDF, £400 for something like a b&c 21ds115 and a few hundred on an amp like an inuke. Building a cab of that size off site would be an interesting transportation challenge, not sure how feasible that is.
     
  6. AndyH76

    AndyH76
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    Crickey, I've just had a quick look at those builds @mattkhan and I think we're in different leagues on cost and diy skills.

    I'm not looking to go to those levels on my first build, I'm still very much a novice when it comes to sub building and the physics involved with room eq etc.

    I am however reading and learning as much as I can as I go along so as not to make any rudimentary errors and wasting my hard earned cash :)

    The space I have was more an indication of what I have to play with rather than needing to fill it up completely. Although it is tempting ;)
     
  7. mattkhan

    mattkhan
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  8. AndyH76

    AndyH76
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    I've had a good look through that thread before and that does seem achievable with my limited skills.
    The depth of the full Marty would be more than I have, could this be made up with slightly extra width or would I be ok to lose the 15cm? All the martys are 65cm deep and I only have 50cm to play with.

    I guess it's back to WinISD
     
  9. AndyH76

    AndyH76
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    Forget my last question I'm forgetting the basics already :facepalm:
    As long as overall volume is the same it shouldn't matter about depth...

    A full or mini Marty seems to be my best bet for a first attempt.
     
  10. MemX

    MemX
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    Don't forget about port length needing to stay the same, though!
     
  11. AndyH76

    AndyH76
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    Drafted in a little help from an unsuspecting visitor...

    The monolith plus will be in the classifieds tomorrow I should think. No going back then.
     

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  12. AndyH76

    AndyH76
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    Just measured up and that leaves me with 100cm W x 51 D x 106 H

    Design of the box should be pretty straight forward I would hope.
    At a later date I should have enough room for another sub at the back of the room, maybe a micro?
     

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  13. MemX

    MemX
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    You could put the entire rear seat on a large sub, do a line of drivers from floor to ceiling in the rear corners, do a wall of drivers at the back of the room... :devil: ;)
     
  14. AndyH76

    AndyH76
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    I've been playing with WinISD all morning and I'm struggling to get my head around port length.
    My box dimensions are going to be 97cm W x 100cm H x 50cm deep this gives me 485 litres or 17 cubic feet.
    My calculations are done using the Dayton Audio UM18-22 18 as the driver.

    @MemX When you say port length will stay the same does this still stand when I've altered the box dimensions so much?
    I've used WinISD to calculate and its telling me to use a length of 25.76cm from a 14cm diameter.
     
  15. mattkhan

    mattkhan
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    if you're completely changing the design then you're designing something from scratch, is that what you intend or are you just trying to adapt the full marty design to your specific space?
     
  16. AndyH76

    AndyH76
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    I had hoped to follow the marty design but I was concerned that I had alerted it too much due to space constraints.
    But memx mentioned that I should keep port length the same.
     
  17. mattkhan

    mattkhan
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    if you keep the following the same then it will perform basically the same

    - internal enclosure volume
    - port volume
    - total cross sectional area of the port(s)

    the last two obviously imply that port length will remain the same

    if you alter any of these then the performance will vary from the design. This is not a problem per se, particularly for small variations from the design, but is something you'd need to keep an eye on. You may also find that varying the design starts to make quite inefficient use of wood and hence you may choose to start changing things anyway.
     
  18. AndyH76

    AndyH76
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    After spending the whole day reading through all the threads about DIY subs I think I've found the best fit for me over on avsforums. Its a slight mod on the cyclops and fits my space perfectly.

    Now to decide whether or not to attempt the build myself or ask gordy from ebay. Has anyone who's used gordy tell me does he build the box or just do the cuts?
    Ideally I'd like to build myself but I don't have the space or tools to do the cuts and I'm not sure I trust B&Q to do it.
     

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  19. MemX

    MemX
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    Gordy can/will build the entire box and post it to you, although I'm not sure about size constraints if you're ordering a 3-foot square box! :laugh:
     
  20. AndyH76

    AndyH76
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    Quick update. I found a local cnc cutting service who will do my cuts and supply the mdf for the eye watering price of..... £30, what a result. Now I just need to make sure I don't mess the build up.

    What would peoples advice be on screwing or brad nailing with such a large enclosure? I'm thinking of brad nailing as the finish won't need to be amazing as it's sitting behind my screen.
     
    Last edited: Jul 22, 2017
  21. MemX

    MemX
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    If it doesn't need to be pretty, whatever is easiest and most effective, I would say!
     
  22. AndyH76

    AndyH76
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    Slow progress at the moment. I bought the Dayton ultimax from the bay, after paying I get an email to say unfortunately this item is out of stock, even though it said 2 remaining! So now I have to wait until the 4th of August to open a case as they wont refund my money. :mad::(
     
  23. MemX

    MemX
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    That is annoying...
     
  24. AndyH76

    AndyH76
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    After a few weeks of research and scouring the net I took delivery of a Dayton Audio RSS460HO 18" last week.
    I'm now just waiting on the cuts to be done and I can get cracking.
     
  25. AndyH76

    AndyH76
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    No going back now...
     

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  26. MemX

    MemX
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    Nice!
     
  27. markymiles

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    And some classic Mission DS surrounds. Good looking room!!
     
  28. AndyH76

    AndyH76
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    Cheers @markymiles, I've been considering replacing the ds77's for ages but they still do the job pretty well. :smashin:
     
  29. AndyH76

    AndyH76
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    Slow progress but it's starting to take shape.
     

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  30. AndyH76

    AndyH76
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    Dry run to see if it fits. Like a glove:clap:
     

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