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View Full Version : My new custom built 10' subwoofer



Lira
05-12-2011, 05:20 PM
http://s4.postimage.org/1441i05wk/DSC03952.jpg (http://postimage.org/image/1441i05wk/)

http://s3.postimage.org/mxa5hfd0/DSC03954.jpg (http://postimage.org/image/mxa5hfd0/)

http://s3.postimage.org/mxlq8utg/DSC03955.jpg (http://postimage.org/image/mxlq8utg/)

http://s3.postimage.org/mxyyjmro/DSC03958.jpg (http://postimage.org/image/mxyyjmro/)

Its a 10' subwoofer with a 51,60mm diameter coil made of kapton with 4+4 ohms for 200W

Later IŽll post some tests on youtube.

Lira
05-12-2011, 05:21 PM
The last picture

http://s3.postimage.org/mxxb0a9w/DSC03957.jpg (http://postimage.org/image/mxxb0a9w/)

mkubawat
05-15-2011, 06:34 PM
dear lira
i have blown 18" 1000 watt p audio speaker , how to make 4" coil for this speaker at home, is it possible.
thanks
m kubawat

MicrosiM
05-16-2011, 06:40 AM
@ Lira


Very nice, How do you center the coil, I mean how do you assemble it, what kind of Glue you are using?

Hope to learn from you

Thanks for sharing! :UP:

mkubawat
05-16-2011, 01:05 PM
dear MicrosiM
Really want to learn from me, I think you're skilled in every way

MicrosiM
05-16-2011, 02:04 PM
dear MicrosiM
Really want to learn from me, I think you're skilled in every way

I am not that skilled!


I repaired many JBL woofers + Horn Drivers + B&C + FBT + Maccaully

I had some problems with FBT, they dont center properly.

I will try to show some pictures soon

JBL is the best into service, While they are Robust speakers :D

Lira
05-16-2011, 05:16 PM
http://www.lcferragens.com.br/config/imagens_conteudo/produtos/imagensGRD/GRD_241_241.JPG
Hi, I use the epoxy bi-component 10h (The pic is showing the 15min, but you will need the 10h, it takes longer but the results are MUCH better!, take care to leave the speaker upside down for the glue not fall on the magnetics), the tricky part is that the spider have to fit exactly the body of the coil, without any space, i use photografic film to center the coil, leaving half of the coil out and half in (the wired part), and the glue for the spider to the housing and also for the edge is the adhesive contact black (If you find you can use Loctite Black Max or simmilar).

Best Regards


Lira

mkubawat
05-17-2011, 11:51 AM
hi
photographic film is not give proper centering with 15" & 18" speakers because there are more gap between pole piece & top plate so i use white plastic paper( i don't know exact word ,probably white mica paper) which is use in motor winding

Lira
05-17-2011, 02:28 PM
dear lira
i have blown 18" 1000 watt p audio speaker , how to make 4" coil for this speaker at home, is it possible.
thanks
m kubawat

first you have to measure the height and the coil winding, then you unwind it carefully counting the number of laps and seeing how many layers you have.
Then you need aluminum film or Kapton film, a coat of varnish colorless or amber high temperature and wrap something 4 'off the excess so that it sits about 1mm free (This is when the coil to expand) .
Wrap a layer of craft paper and only one coat of varnish over the paper, wrap the floss without leaving any space between one turn and another, and after rolling, one more coat of varnish.
It is important to let the paint dry a little between one step and another, but not much, to keep the reel out of the place in shape.
After everything done, let it dry for at least 24 hours, remember, haste is the enemy of perfection!

Hope this helps


Best Regards

Lira

MicrosiM
05-17-2011, 07:45 PM
Lira

Here some pictures from speaker I will repair soon.

This speaker fails very quick, I dont like it :"::

Lira
05-17-2011, 09:28 PM
Hi, IŽm assembling a speaker, if you have some time, wait a little, iŽll post the pictures step by step of the whole process, from centering the coil to glue the sorround, including how do I center the coil exactly, I think it might help you repairing yours.

Best Regards

Lira

mkubawat
05-18-2011, 05:01 AM
thanking you Lira
I try my best
can you explain about contents which is have in your glue(scotch mix) because it is not available in India.

Lira
05-18-2011, 01:29 PM
I think ARALDITE is available in india you can use this one for the coil on the spyder and on the cone
http://www.huntsman.com/advanced_materials/Images/8142/50_Nordic_Bostik_ExtraStrong_right.jpg
and this one for glue the metal parts
http://www.huntsman.com/advanced_materials/Images/8142/48_InternationalRange_RapidSteel.jpg
Here is the link with everything you need
http://www.huntsman.com/advanced_materials/eng/Markets/Adhesives/For_Consumers/Araldite%C2%AE_Consumer_Adhesives/index.cfm?pageID=5909
http://www.huntsman.com/advanced_materials/eng/Markets/Adhesives/For_Consumers/Araldite%C2%AE_Consumer_Adhesives/index.cfm?pageID=5908

mkubawat
05-19-2011, 05:00 PM
thanks Lira
ya ARALDITE is available in india but rework is not possible after using araldite if we want replace only voice coil. if possible please tell me. very difficult to replace only to voice coil in branded speaker and stuff the rest is put into use again.Have any idea .....

Lira
05-20-2011, 01:07 PM
It's a controversy, if repair this with a glue that it's not tough enough, it will fail soon, but will preserve the original parts, if you use any kind of epoxy glue, you won't be able to repair it again.

What would i do in your case: First disassemble the whole speaker an than take note of everything, the cone hardness, the voice coil (Number of turns layers, kind of wire, kind of material etc...) and try to copy, from the scratch, you will get a lot better result doing this. I tried to repair many many speakers, but the repaired speakers is not as good as the ones i use new material to repair, even the speaker has flat wire on the coil, you can use round wire, the difference is not that big, considering you repairing and old coil versus a new one. If the original coil is made of aluminum, you can change to Kapton or fiber and have a more eficient speaker.

In any of cases you will have to re-measure the Thielle-Small parameters to ensure all the parameters of the speaker.

Hope this helps

Best Regards

Lira

MicrosiM
05-20-2011, 11:57 PM
Lira.

JBL Used the special flat wires, they used the flat wire coils in all of there professional speakers.

Once there is a cut into that it will be impossible to solder it.

JBL is robust speakers indeed.

Lira
05-21-2011, 12:56 AM
Lira.

JBL Used the special flat wires, they used the flat wire coils in all of there professional speakers.

Once there is a cut into that it will be impossible to solder it.

JBL is robust speakers indeed.

I know, if you can use it, if it is in good conditions, you must use it. I was saying about, because there is some cases that the coil is deformed or old(with not correct impedance), in that case, you can try using it, but if it keeps blowing i sugest rebuild everything! Perhaps i didn't understand de problem well, sorry.
I have some speakers to repair, they use flat aluminum coil, very hard to solder, i didn't repaired already because of that problems.

My idea was to try to copy the coil in round wire to use-it in case of unrepairable original coil.


Thanks

khalsa
05-21-2011, 04:29 AM
hi microsim soldring is possible

Lira
05-22-2011, 02:29 PM
Lira

Here some pictures from speaker I will repair soon.

This speaker fails very quick, I dont like it :"::

I centered one woofer today succesfully using about 4 layes of OhP transparency paper, the only difficulty part was to remove the OhP paper from the coil, because it was too tight. But the speaker is now on pink noise for 72 hours. I,ll edit e videos and the pictures and post here soon.

Thanks for the attention! :D

mkubawat
05-22-2011, 04:15 PM
how to test a speaker with pink noise & where i find it

tre4u2nv
05-22-2011, 09:40 PM
This is so intresting thank you lira for sharing

Lira
05-25-2011, 06:48 PM
how to test a speaker with pink noise & where i find it

Its simple, first you need a reliable pink noise sourcehttp://www.burninwave.com/, such a software with a good sound card( like maudio or similar, cheap audio card wont work) or an audio processor like behringer utracurve pro (DEQ2496) (This one is what i use), a good condenser mic, plugged in the sound card and a software for spectrum analize like TrueRTA http://www.trueaudio.com/rta_abt1.htm, to power the speaker, you need a amplifier with a maximum 0,002THD 100W RMS.

You have to equalize the pink noise output to be as flat as possible in all range of frequencies with the mic that you are using. than you can test the speaker.

Later i put the pink noise with 70% of the power of the amplifier to soften the speaker (I know, it will be a bit loud) and leave for 48hours, than i make all the tests again.


That's it. if you have any further questions I'm here to help

Best Regards

erhan739
05-26-2011, 11:26 AM
Thanks LİRA, It's a good explanation

mkubawat
05-26-2011, 11:49 AM
hi Lira
sorry but i don't understand, What role will the mic and where to put

Lira
05-27-2011, 01:01 PM
Well, it's good you record the pink noise on any device such as a good mp3 recorder on 320kbps, and use this as a external pink noise source, them plug the mp3 player on the line in of the soundcard and see if the pink noise of your source is accurate. Be sure to disable any equalizer or sound enhancement devices on the mp3 player to have the pink noise flat. Once you have your source of pink noise ready to go, plug off the soundcard and plug in on an amplifier. Now you put the mic on the mic input of the soundcard, (You can use a mixer between the soundcard and the mic but you will have to plug the mixer on the line in of the soundcard), and start testing. the mic must be at least 20cm of the speaker. If you want you can use a sealed box to make this test, than you can see the curve of frequency of your speaker on the trueRTA. Its a bit tricky to get it working for the first time and get the right parameters, you have to watch for the volume to not saturate the sound of the speaker, testing different volumes, you will get the idea how your speaker can operate in differents powers.

That's it. if you have any further questions I'm here to help

Best Regards

mkubawat
05-29-2011, 04:28 AM
Thanks Lira

mkubawat
05-30-2011, 08:12 AM
anybody know about scratch resistant mat black paint for commercial speaker box & where to find in india

mkubawat
06-02-2011, 03:30 PM
hi
any one know ,what is the benefit of reverse fitted woofer

Lira
06-03-2011, 12:57 PM
You mean put the woofer reverse on the box like this?
http://www.glasswolf.net/papers/box2.jpg
Or this?
http://www.glasswolf.net/papers/box5.jpg

mkubawat
06-03-2011, 02:00 PM
like a first picture
also post about phase system when play many speakers , woofer (when all speaker are at a place)

Lira
06-03-2011, 02:57 PM
Well, its good only for bass/ sub frequencies, because of the dome of the speaker produces high frequencies will be inside de box. You will have to plug it inverted on the amplificator to be in phase of the other speakers. For bass/midbass its not recomended because you will loose the higher frequencies.

mkubawat
06-04-2011, 01:50 AM
thanks lira

mkubawat
06-06-2011, 03:52 AM
hi lira
please tell about 2nd picture

Lira
06-06-2011, 12:56 PM
This kind of alignment effectively cuts the vas in half, twice the power, and half the box size.
Pros: Very small enclosures, increased power handling, driver non-linearities canceled out (lower distortion).
Cons: Very low efficiency, due to the small size of the recommended enclosures.

mkubawat
07-24-2011, 03:26 AM
how to make scratch resistant paint for speaker box or which contains have in this type of paint.

thanks

mkubawat
08-24-2011, 06:22 AM
how to paint scratch resistant , like JBL or RCF speaker box

Lira
08-24-2011, 09:59 AM
I use with success polyurethane automotive painting, using 4 or 5 layers of panting. If you need a more resistent painting you can do 10 layers for professional use.

Best Regards

Lira

mkubawat
08-25-2011, 11:40 AM
I use with success polyurethane automotive painting, using 4 or 5 layers of panting. If you need a more resistent painting you can do 10 layers for professional use.

Best Regards

Lira

I have no spray system, can i use roller for polyurethane automotive painting.if yes which type of roller is suitable for polyurethane.

Thanks for your cooperation.

Lira
10-05-2011, 09:46 PM
Sorry for the late answer;
I dont recomend use roller, but you can try the ones that is not made of sinthetic materials, or try to use a big brush. Try 5 layers of painting, because with brush, you will use more ink.


Best Regards

Lira

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06-09-2016, 11:33 PM
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jackstone
07-21-2016, 04:22 PM
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