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Shiva tube sub complete

Discussion in 'Home Cinema Building DIY' started by slingshot, Nov 18, 2003.

  1. slingshot

    slingshot
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    Well almost complete needs some final polishing and finishing, but hopefully I've attached some pics.

    Basically it's a 140 litre vented tube, driver in the bottom.

    The base it sits on was kindly provided by Taz (cheers Taz !).

    I'm happy with the sound, not so happy with the veneering, trying to veneer a tube was probably biting off more than I could chew, but it's not too bad.

    I'll post frequency response later if anyones interested.

    Cheers

    Slingshot
     

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  2. slingshot

    slingshot
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    And here's the top port, needs a grill making from speaker cloth, just loathe to buy a meter when I only need 4 inch diameter.
     

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  3. buns

    buns
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    looks nice!

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  4. GaryG

    GaryG
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  5. slingshot

    slingshot
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    Here's the in room response. 50 Hz peak is due to room and is normally pretty bad (mains normally show a 15db peak around here)

    Thought I had the X-Over at 80Hz but looking at the measurements it appears to be about 60Hz so I really need to redo it.

    I adjusted the tuning frequency to smooth it out downto 20Hz but have lost some db's below.
     

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  6. buns

    buns
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    with a quick bfd'ing it has the potential to be a very flat response. Even as it is it looks good

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  7. slingshot

    slingshot
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    Thought about a BFD, but I'm leaning more to room treatement because that should then sort the mains out aswell.

    I use the mains full range for music (sub added for the really low stuff using the X-Over on the sub).

    I actually did some measurements a couple of inches from the sub to prove it was the room (i.e the room reflections should have naff all effect at that distance) and it was a lot more impressive, so maybe I should stick the sub on my head.
     
  8. buns

    buns
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    I have a link to a good diy neckbrace if you go this route :D

    I would do the room treatment too if I had the chance, you really want the use of as little equalisation as you can get away with

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  9. Taz

    Taz
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    Looks good! Glad to have helped. :smashin:
     
  10. Exeter Man

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    slingshot,

    Looks really nice mate, and I can't see anything wrong with the veneer on the picture :smashin:

    Sorry if i've missed these in a previous thread, but out of curiosity, what type of veneer and amp have you used ?

    PM me your address, and i'll forward some speaker cloth FOC as i've got loads to spare. Ordered 0.5m from Maplin and they sent me 4m of the stuff.

    Regards
     
  11. BigToe

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    Good work slingshot!

    And as Exeter Man stated - can't see anything wrong with the veneer on that image.

    Also interested in which amp you used :)
     
  12. slingshot

    slingshot
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    The veneer is just cherry veneer I got from http://www.jcrispinandsons.co.uk/

    I used glue film to attach it, which is excellent for flat surfaces, however it's a bit difficult on convex surfaces (maybe contact adhesive would work better next time.

    The amp is a 200Watt BKS jobby, it's separate from the sub (actually leant against the wall until I get round to making a box for it !)

    Cheers exeter man PM on it's way, let me know and I'll at least pay the postage.

    Cheers

    Slingshot.
     
  13. Exeter Man

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    I've tried PVA and contact adhesive for attaching veneer, and would definitely recommend contact adhesive as the most straightforward method if you haven't got all of the pucka veneering kit (eg. press, vacuum jobbie etc).

    Regards
     
  14. slingshot

    slingshot
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    Thanks Exeter Man the cloth turned up this morning, and will do the job well.

    Thanks again.

    Slingshot
     
  15. Exeter Man

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    slingshot,

    No problem - looking forward to seeing some more piccies with the grill in place.

    Regards
     
  16. micb3rd

    micb3rd
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    Very nice sonosub you built there, around 5 cubic feet ported to 20hz should sound faboulous.

    BTW how much was the tubing?

    I have been tempted in the past but I have no real way of doing the end caps flush.

    I seem to have 5 different subwoofer designs I could currently do, mabye one day i'll get round to building some more.
     
  17. slingshot

    slingshot
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    The tube was around 50 quid incl delivery. It does sound pretty impressive. I actually bumped the tuning up to around 22Hz now, was originally 21.5 but I wanted to smooth the low end a bit (the good thing about building your own sub is the ability to tune it for your own room).

    The end caps were pretty easy using a router and a home made jig.

    Slingshot
     
  18. smallangryboy

    smallangryboy
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    I'm glad I stumbled on this thread.

    I hope you may be able to help. I'm in the middle of developing some bespoke speakers for my home cinema system and I'm looking to partner an active subwoofer with them. I've been looking at the SVS 25-31PC-Plus subwoofer, as it's got an excellent reputation in the UK, and is similar in size to what I'm after.

    But I've been bitten by the DIY bug and fancy having a go myself. I wondered if anyone recommended any drivers and amps to go into a 30" tall 16" wide sonotube so that it's up there with the SVS quality wise and extension of bass.

    I've attached my designs, I'm having the caps turned in real wood as this is beyond my expertise but a bit of gluing and painting is OK :) Any advice greatfully received.

    [​IMG] [​IMG]
     
  19. slingshot

    slingshot
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    Design looks good, I'm currently hoping to re-veneer mine in Oak to replace the Cherry.

    Not sure what tips I can give you. Make sure everything is sealed using bathroom type sealant, yours is going to be slightly more difficult since you're placing the amp in the tube (probably just a few more gaps to seal.

    Anyway let me know if you have any questions, and I'll try and answer them. One big thing I found was the portion of the endcap going in the tube will fit easier if you bevel the edge slightly.

    Have fun

    Slingshot
     
  20. smallangryboy

    smallangryboy
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    Cheers for the encouragement, I was basically wondering what driver to go for. The Shiva looks good as do some of the Peerless ones, and using my rusty skills on WinISD a ported 87 litre enclosure tuned to about 21Hz seems to yield a decent response.

    Wondered if you had views on any specific drivers ? Ones readily available to the UK are favourite, and good for HiFI not just AV.
     
  21. smallangryboy

    smallangryboy
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    Heres how yours might look in Oak Veneer - though a bit taller :)
    [​IMG]
     
  22. Capt Morgan

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    Hi Just saw the note about sealing with silicone "Bathroom" sealant, You may want to investagate this as I understood that there are chemical fumes given off from the sealant that can rot the rubber suspention of some drivers.

    I'm unsure if this is an ongoing process or simply while the silicon goes off....
     
  23. micb3rd

    micb3rd
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    I have used Silicone sealent in the past, a word of warning though.

    Some types of Silicone sealent do releace crossive acidic fumes (acetic acid), these can eat driver motor parts and the surround.

    It should not be used for sealing in speaker/subwoofer drivers, it releases corrosive fumes in the cure stage, you should wait untill after the the cure stage so there there is no fumes.

    Cure stage is usully 12-24 hours.
     
  24. MikeRJ

    MikeRJ
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    Awesome job, very impressive! The veneering looks fine in the pictures, though its ertainly something I'd have had doubts about doing myself.
     

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