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  1. #1
    Join Date
    May 2004
    Location
    Australia
    Posts
    4

    Exclamation Need Help Urgent

    Hello all

    My name is Curtis. Im in year 9 and for D & T were doing speakers. Ive got myn picked out and all the information, but my dt teacher is not giving me the help i need. I have all the info, thanks to www.jaycar.com.au, and i just need a little more to get me off.

    Nominal impedance: 4 Ohms
    Power Handling: 125 Watts rms
    Sensitivity - SPL - 1Watt @ 1 metre: 88.17
    Voice Coil Resistance (Re): 3.5 Ohms
    Resonant Frequency (Fs): 33.298Hz
    Mechanical Q Factor (Qms): 8.193
    Electrical Q Factor (Qes): 0.534
    Total Q Factor (Qts): 0.502
    Equivalent Volume (Vas): 29.55 Litres
    Cone Area: 0.0346 Square metres.
    Voice Coil Diameter: 50mm
    Xmax: 9mm
    Speaker dimensions: A 255, B 245, C 233



    Typical application
    Vented box:
    Box volume (litres) 48lt
    Tuning Freq (Hz) 26.54Hz
    -3dB point (Hz) 25.15Hz
    Cabinet dimensions (internal)
    591(H) x 365(W) x 226(D)mm
    Port size 66mm dia, 270mm long



    What dimensions do i need to order for my wood? Im getting it professionally cut, and i was told to leave 1 mm or so? And the thickness of the wood is also unknown to me. If any information could be forwarded, it would be appreciated.

    I also know that i may have missed anything, so if u pick up anything i need to know, please, tell me

    Thankyou for your time,

    Curtis

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  3. #2
    Join Date
    Aug 2003
    Location
    .
    Posts
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    Default

    Run for your life Beefa, the spelling Nazis are coming, RUN Beefa, RUN

    Sorry I cant help with your question.

    Al

  4. #3
    Join Date
    May 2004
    Location
    Australia
    Posts
    4

    Default

    whats wrong with my spelling?

  5. #4
    Join Date
    Aug 2003
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    .
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    As far as Im concerned, nothing!

    But other people here have this thing for pulling people up for their spelling.
    So you better RUN.....................
    Im not having a go at you Beefa.

    Cheers, Al

  6. #5
    Join Date
    Mar 2004
    Location
    Perth & Pilbara WA
    Age
    56
    Posts
    32

    Talking

    Appears the spelling Nazis may have been flamed into silence, or maybe they have gone to a spelling board. :eek:

    Sorry Beefa, can't help with your question either - all that talk about frequencies and factors is far too testical for me.

    Geoff

  7. #6
    Join Date
    Apr 2004
    Location
    Adelaide
    Posts
    186

    Default

    Dear Mr. Curtis Beefa, I also know close to bugger-all about resonance, impedance etc. However I do know something about buying magazines, and, coincidentally, Fine WoodWorking Dec. 2002 edition has an article on building an entertainment centre. The chappie who wrote it does appear to know what he's talking about. He suggests speaker boxes could best be built from 1/2 inch (okay he's a yank) MDF with 1/8 hardboard laminated either side.

    Hope this helps. If you want further info from this atricle you should find it at your local TAFE which specialises in woodcrafts.

    PS: Ozwinner, you win tonight's prize for making wine come out of my nose from laughing too hard!

    Cheers,
    silkwood

  8. #7
    Join Date
    Aug 2003
    Location
    Perth (NOR)
    Age
    78
    Posts
    1,386

    Default

    Curtis

    First off: If you put your location in your profile, members of this forum may be able to give you help as where to go to get the right advice or materials. Australia is a large place tho.

    I would use 18 mm MDF with veneer, which makes it 19 mm thick. Then you should use 45Deg joints so as not to have the MDF showing. This means that you have to allow 2 x 19 mm to the width, height and depth. Have you got the use of a tilting arbor table saw...if not it is not worth the trouble to calculate the dimensions.

    The size to cut the MDF depends on the amount you have to allow for the joint type. Have you got a plan of how you want to construct the box?


    If you get your MDF from a specialist supply shop you can give the inside dimensions that you have to them and their machinist will cut the mdf to the correct size including the 45 deg chamfer all round. Ask him nicely and he may even glue it up for you. Then like hundreds of other D&T students, your part of the D&T is to fit the speakers and finish the verneer. If you use unverneered MDF, you just need to paint it.



    Gee D&T has come a long way since it was called "Woodwork" and the students actually did the work themselves overseen by the "Woodwork Teacher".

  9. #8
    Join Date
    Apr 2004
    Location
    United States
    Posts
    317

    Default

    If the person machining your material can make miter-lock-corners, I'ld suggest you have the corners prepared this way. You can get them for either a shaper or to use in a router table.

    For an image, check out http://www.grizzly.com/products/item...emnumber=C2125 to see what a cutter looks like.

    They make holding miter corners while gluing much easier if done properly.

    Good luck on your speakers.

  10. #9
    Join Date
    Apr 2002
    Location
    Margate Tasmania
    Posts
    1,148

    Default

    Soundman, come on down, but in his absence I'll have a go.

    Beefa,
    You have provided the internal dimensions for the box,
    Cabinet dimensions (internal)
    591(H) x 365(W) x 226(D)mm
    Port size 66mm dia, 270mm long

    Use these to draw up your design, determine how you are going to make your joints, determine whether you are using pre veneered board, veneering afterwards or painting, ring an mdf supplier and get dimensions of the board you intend to use. Complete your design.

    Surely Beefa, part of design & technology(I'm guessing that that is what D&T stands for) is to actually be able to draw up what you intend to build.

    My 2cents worth, I'll get off my soap box now.

    regards

    Kev M

  11. #10
    Join Date
    May 2002
    Location
    in the outer reaches of Sth Oz
    Age
    75
    Posts
    1,604

    Default

    apparently its all too hard to study or use the resouces supplied by a school nowdays. Instant answers is what they want now not study and learn.....you supply the answers and he puts it into his paper and there ya go instant A
    Peter :mad:
    What this country needs are more unemployed politicians.
    Edward Langley, Artist (1928-1995)

  12. #11
    Join Date
    Jun 2003
    Location
    ...
    Posts
    7,955

    Default

    Quote Originally Posted by fxst
    Instant answers is what they want now not study and learn.....you supply the answers and he puts it into his paper and there ya go instant A

    Peter, we went through this a little while back with TheFool who also wanted us to do his work.

    At least Beefa's spelling is a lot better than his was as so far only Ozwinner picked on his spelling.

    Maybe we are now on a mailing list for doing everybody's schoolwork :eek:

    Peter.

  13. #12
    Join Date
    Aug 2003
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    .
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    Now come on Peter!!!!!!!!!!!!!!!!!!!!

    Im NOT the spelling Nazi. :eek:
    There are enough of them already without me joining in.
    I was just warning the poor kid before it was too late.............

    Al

  14. #13
    Join Date
    Jan 2004
    Posts
    686

    Default

    Kev M's picked it up guys.

    The 'design' part of D&T is that you should be able to figure out how/what sizes you need to cut given dimensions. (hint - draw this out on a piece of butcher's paper and all will become obvious)

    The research part is done in part as beefa's found some of the info he's been asked to find (well . . . almost . . . what material are you going to use, and how thick is it? - you'll need thickness to determine the lengths to which you'll need to cut the timber. Depth of the cabinet (=width of timber) is also in your specs that you've cut & pasted off the Jaycar site).

    The 'technology' part of D&T includes the making part


    If you can't figure it out Curtis, try going to your teacher and explaining exactly what you have done and then what you can't figure out, not a general: "I don't know". Just a guess on my part as to what you said.

    Teachers will generally help those that have a go, instead of those that sit around and expect things to be given to them. Sounds as though you could be one of the ones that's had a go to date but have hit a snag.

    (By the way, the D&T syllabus that the teacher is working to requires you to do the research and the working out, with the teacher there to help/guide you to solutions and ways around problems. eg: you're meant to be learning how to solve problems. I'd hazard a guess that the teacher's doing what's required - I'm a D&T teacher now, as well as a cabinetmaker)


    Just a wild guess - is this urgent because it's due Monday?

    Cheers,

    eddie
    Last edited by eddie the eagle; 15th May 2004 at 05:47 PM.

  15. #14
    Join Date
    Feb 2004
    Location
    Oxley, Brisbane
    Age
    79
    Posts
    3,041

    Default

    Ozwinner
    Im NOT the spelling Nazi.
    Sorry, too late by far.

    Ozwinner's a spelling Nazi, ozwinner's a spelling Nazi.
    Last edited by Bob Willson; 16th May 2004 at 03:41 PM.
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

  16. #15
    Join Date
    Aug 2003
    Location
    .
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    Default

    I waz warning him before yuz got to him,,,,,,,,,,,,,,,,,,,,,,,

    See, I dont care if their speld rong.

    Al

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