Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 15 of 36
Thread: Need Help Urgent
-
11th May 2004, 07:17 PM #1New Member
- Join Date
- May 2004
- Location
- Australia
- Posts
- 4
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
-
11th May 2004 07:17 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
11th May 2004, 07:50 PM #2Registered
- Join Date
- Aug 2003
- Location
- .
- Posts
- 10,482
Run for your life Beefa, the spelling Nazis are coming, RUN Beefa, RUN
Sorry I cant help with your question.
Al
-
11th May 2004, 07:57 PM #3New Member
- Join Date
- May 2004
- Location
- Australia
- Posts
- 4
whats wrong with my spelling?
-
11th May 2004, 08:05 PM #4Registered
- Join Date
- Aug 2003
- Location
- .
- Posts
- 10,482
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
-
11th May 2004, 09:56 PM #5Awaiting Email Confirmation
- Join Date
- Mar 2004
- Location
- Perth & Pilbara WA
- Age
- 56
- Posts
- 32
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
-
11th May 2004, 10:23 PM #6Senior Member
- Join Date
- Apr 2004
- Location
- Adelaide
- Posts
- 186
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
-
12th May 2004, 12:06 AM #7
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".
-
12th May 2004, 11:19 AM #8Senior Member
- Join Date
- Apr 2004
- Location
- United States
- Posts
- 317
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.
-
12th May 2004, 02:12 PM #9
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
-
12th May 2004, 07:31 PM #10
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)
-
12th May 2004, 07:56 PM #11Deceased
- Join Date
- Jun 2003
- Location
- ...
- Posts
- 7,955
Originally Posted by fxst
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.
-
12th May 2004, 08:01 PM #12Registered
- Join Date
- Aug 2003
- Location
- .
- Posts
- 10,482
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
-
15th May 2004, 05:27 PM #13SENIOR MEMBER
- Join Date
- Jan 2004
- Posts
- 686
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,
eddieLast edited by eddie the eagle; 15th May 2004 at 05:47 PM.
-
15th May 2004, 06:34 PM #14
Ozwinner
Im NOT the spelling Nazi.
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.
-
15th May 2004, 06:44 PM #15Registered
- Join Date
- Aug 2003
- Location
- .
- Posts
- 10,482
I waz warning him before yuz got to him,,,,,,,,,,,,,,,,,,,,,,,
See, I dont care if their speld rong.
Al