Speaker Cone - How to Build One w/ Cardstock
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- čas přidán 8. 09. 2024
- Using an old 4 Ohm loudspeaker to demonstrate my method and procedure to construct a new (loudspeaker) speaker cone (truncated cone/frustum) when a matching replacement cone is not available.
Online resources:
A pattern for a truncated cone - Math Central
Check out the Excel Spreadsheet by Don Nevin.
mathcentral.ure...
Cone/Frustum/Truncated cone Calculator
r = r
s = rH
Angle = 360 - A
www.hampsonlife...
And another great resource where no math or drawing template is required.
www.templatema...
Black Cardstock Paper | Solid-Core Cardstock Paper | Flat Shipping
www.cardstock-...
Above cardstock also available at Amazon.
Speaker Polarity Tester w/ AD8302 Phase Detector Module
• Speaker Polarity Teste...
Music attributes:
The 126ers
Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.
#restoreoldradios
Thank you Sir for this detailed description of the cone replacement process and old good days math. With your craftsmanship and relaxing voice it was a pleasure to watch.
Thank you for your kind words and I’m glad you enjoyed the content. All the best. Don
Well done Don. This is one the most difficult repairs to do on a radio. Takes a finess for sure and several tries to find the
sweet spot to fit the cone properly. The before and after was a great difference, and proof it needed to be done.
Thanks Steve. It was a perfect donor for a little experimentation. Take care and all the best. Don
That's a great repair Don, I learned a lot and with that calming voiceover I kinda feel relaxed too. I am in my 30's and like to listen to music and repair/ restore my own stuff and restoring and modding speakers is one of my favourite things to do.
With love, Max 🙂
Max - I appreciate your kind words and I hope your repairs/restorations go as planned. Thanks again and all the best. Don
The before and after sound quality improvement was significant. Thanks Don for spending the time to show the detailed procedure. Beautiful job.
Thank you John. I was surprised with the improvement; definitely noticeable to my old ears. Best, Don
Thank you Mr. Don. I am about to have to dive into re-coning a 4" PM speaker off of a Truetone radio. Without your video tutorial I would not even have attempted it. Especially the cone template part.
Thanks for all your great videos.
Luther
Luther - glad it has been helpful. I hope all goes well on your rebuild. Best, Don
This is an excellent demonstration of your process to replace a speaker cone. You’ve made an intimidating task look much easier. Thank you.
Ditto!!! Enjoyed watching.
Thank you Jim. It was a fun project and I still have much to learn about the subject. Thanks again. Best, Don
Much appreciated John. Best, Don
Excellent job and explanation !! Congratulations !!!
Thank you, much appreciated. Best, Don
Excellent repair. Sending my support
Much appreciated! Best, Don
I use that Renaissance wax on my rifles and gun stocks always makes them look great. Now I have another use for it. Great tear down and build up video of that speaker Don. You really do great work Don.
Larry - me too. It’s a great rust inhibitor and works well on those old radio chassis’ too. Thanks for your kind words Larry. Best, Don
Absolutely fantastic tutorial and resource references, thank you!!
You're very welcome! Glad you found it helpful. All the best. Don
This guy is really good to explained this theory
I appreciate you watching and reaching out. All the best. Don
I really like the Excel spreadsheet and math to create a cone from a flat sheet of paper.
Jim - I agree; it's a well laid out spreadsheet and so easy to use. Thanks for watching and I hope you're doing well. Best, Don
Excellent ! There is no other word ! Thank You Don!
Dean - thank you. Keep me posted on your efforts and feel free to reach out if you have any questions. Best, Don
Definitely saved to my list for the tutorial I will follow. Thanks so much.
Hope it helps Jim. I’m sure the process can be improved upon and I would appreciate any feedback as you tackle your upcoming projects. Best, Don
Excellent work, salute from Venezuela.
Thank you so much. I appreciate you watching and reaching out. Best, Don
Very impressive Don. At some point I have to bite the bullet and attempt something similar. I have several old Zenith AM-FM tube radios of the same type, all of which have bad or no speakers. I doubt very much my attempts will be nearly as elegant as yours. :)
Thank you Doug. Don’t underestimate your abilities; I know you’re more than capable to mirror or exceed my results. Have fun and go for it. Best, Don
Thanks for the video and the links, great knowledge resource. I now wonder how the GSM of the paper will affect the tonality.
Good question! For these old radios from the 30s and 40s you can’t hear any differences, but I’m sure a modern day high fidelity system would make things more noticeable to a trained ear. Best, Don
@@RestoreOldRadios Thanks Don. In the context of guitar cabinet speakers I do think cone thickness will definitely impart voicing to different speakers, I will look for more info about speaker doping, and definitely start by trying out your method with various thickness of cardstock.
@@mohitrahaman Sounds great. Please keep me updated on your results/findings. Best, Don
This is very helpful, thank you. I have a set of pioneer cs-g101waii speakers that I am trying to repair.
Glad it helped. I’m getting ready to build a new cone myself for a little 5” electrodynamic speaker from 1941. Hope you’re successful. Best, Don
Great job thanks
Thank you too! I appreciate you watching. Best, Don
Excellent! Great job. This is just what I’m looking for. Your channel is one of my favorites!
Lane - thank you, I appreciate your kind words. Thanks again for watching and reaching out. All the best. Don
This was very interesting and informative. Curious, why did you glue the voice coil first then the surround? Does this lead to better alignment? Thanks from Colorado.
Great question. Being the homemade cone is not perfectly symmetrical, I didn’t apply adhesive at the same time, ie., around the voice coil and surround area to ensure I didn’t have any rubbing of the voice coil. I probably could have done both at the same time and got good results as well, which is the common practice. Sorry for my belated response. Best, Don
@@RestoreOldRadios thanks for the response, no worries on time delay.
Good bro 😎
Thank you. Best, Don
Nice video. I have 2 speakers one has a good cone but the spider came unglued from the voice coil former, however i also noticed that if i gently push down it pops into place until i play it. Even when popped in place, the spider and cone are up a little farther than normal and there is barely any resistance when pushing down on the cone and is extremely easy to bottom out. Much easier than any other speaker I have.
Is this fixable?
also where do i get the round flat felt pieces for the old school felt dust caps as when I do my recone this is also shot and will need to be replaced.
Just perfect ...
Nice solution ...
Much appreciated Valdir. Best, Don
Very nice, Don. Thank you.
Thank you Martin. All the best, Don
Excelente muchas gracias 😊
Thank you. I appreciate your input. All the best. Don
Excellent work.
Much appreciated. Thanks for reaching out. Best, Don
What a awesome video. Pretoria, South Africa.
Will you able to share the excel spread sheet.
Thanks for watching. A link to the spreadsheet is in the video description along with other… All the best. Don
Great job Don. L and s all my very best.
Thanks for watching Bobby. Best, Don
Sir watching your video i noticed you did not show how to remove the remaining cone from the voice coil
I used lacquer thinner in a well vented area with a small brush to apply it not to saturate the voice coil former as it can easily degrade in seconds and then ever so gently cut away the remnants of cone from the voice coil former. It’s a tedious process for sure. Hope this helps. Best, Don
Well done 👍✅ Good job Sir 👌👌 its very Helpful for making new one❣️Love From Pakistan 😘
Thank you. I’m glad it was helpful. Best, Don
The rattling is gone, that's good.
But so is all the treble - because of the missing whizzer cone and the much greater inertia (mms/cms) of the new cone/suspension structure.
This technique is useful for an A.M. radio, but I wouldn't do it on anything seriously reproducing music - better just to put in a modern day full range speaker driver then - you can still find such resembling the original one.
Yep, I agree; it’s perfect for those old AM radios. Thanks for reaching out and watching. Best, Don
whizzers and even full range 4" speakers can sound very good
@@lunam7249
Sure, but this is more of a mid-woofer than a full range - it can only reproduce lower frequencies well.
thank you sir i really like your videos its help me alot but i cant find the way how to observe the informations in the website :((
hope you help me❤❤
but its okay if you dont😊😊
Did you check the video description? I placed the information in that area. Best, Don
Great job. Can the foam surrounds be purchased ?
Check out my earlier reply. Best, Don