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cleaned polydome

I got a pair of 7 Kappa in a trade without original mids. I bought one Polydome that is a bit yellow but in good shape, no craks. I have not sourced a second but after spending hours reseraching all this on Polydomes and wondering if it is worth my trouble to try and get original Polydomes and maintain them or just purchase a pair of the ones offered by:
SimplySpeaker -
Infinity 4 ohm Copy Dome Midrange for 902-3075 Kappa 6 7 8 9 Speaker M-330v2
MidWest - MW Audio MM-2150 v2: 3" Dome Infinity Copy Midrange - 4 ohms

I got it’s bigger brother the kappa 9

look on eBay , you can find Replacements they are not cheap units to source.
 
The unit on the Left (AVA Sample) is a Sample of my Reproduction Project. It is new, not heated or treated. Sorry, I know the thread was about treating old ones, just thought I would add the progress on my project to create Replacements.

Hi Bobby, I just ordered 2 pair of your Emit Diaphragms online, strictly as spares, while they are still there. I purchased these immaculate Kappa 8's from a local new and used Audio Retailer who's shop went under last year due to Covid, he now operates privately. The domes have yellowed, but are still pliable. I wanted to see what I can do for my "cancer patient" while still in stage 1 / 2. I saw the techniques people used and was wondering, 2 years later, if there were any negative side effects. I also wanted to know how your, "polydome project" went. Any thoughts appreciated and Big Thanks for doing what Harmon/Infinity won't...
 
Hi all,

I recently got a pair of Kappa 7.1 Series 2. My domes are perfectly soft and pliable but did get yellow.

Given this situation, is there a NEED to do something to them right now or no? It does sound a bit scary / risky since replacements aren't exactly cheap or easy to get. If this is mostly a cosmetic improvement that isn't needed for anything else I'd probably rather leave them alone.

Thoughts?

PXL_20230107_224615458.jpg PXL_20230107_224602934.jpg
 
To my knowledge, no treatment has been found to extend the life of the Polydomes. Just enjoy them as long as they continue to work.
 
To my knowledge, no treatment has been found to extend the life of the Polydomes. Just enjoy them as long as they continue to work.
Thanks! In that case I'm not going to run the risk of ruining them for no reason other than cosmetics.
 
When I was rebuilding Polydomes I would apply 303 Protectant as a final step. It reduces damage from UV, and protects plastics.
303 (30302) UV Protectant Spray https://a.co/d/e73zIAQ

If your Domes are still soft and pliable you can get the yellow out by applying some heat with a blow dryer, but on low and from a distance at first, constantly rotating the dryer to spread heat evenly and lightly until they start to go clear. This isn’t for the faint of heart, and you do it at your own risk LOL! But it does work!
Good Luck!


Hi all,

I recently got a pair of Kappa 7.1 Series 2. My domes are perfectly soft and pliable but did get yellow.

Given this situation, is there a NEED to do something to them right now or no? It does sound a bit scary / risky since replacements aren't exactly cheap or easy to get. If this is mostly a cosmetic improvement that isn't needed for anything else I'd probably rather leave them alone.

Thoughts?

View attachment 2760435 View attachment 2760436
 
When I was rebuilding Polydomes I would apply 303 Protectant as a final step. It reduces damage from UV, and protects plastics.
303 (30302) UV Protectant Spray https://a.co/d/e73zIAQ

If your Domes are still soft and pliable you can get the yellow out by applying some heat with a blow dryer, but on low and from a distance at first, constantly rotating the dryer to spread heat evenly and lightly until they start to go clear. This isn’t for the faint of heart, and you do it at your own risk LOL! But it does work!
Good Luck!
Interesting. I'll give that a go! So not too close and with a lot of patience then?
 
When I was rebuilding Polydomes I would apply 303 Protectant as a final step. It reduces damage from UV, and protects plastics.
303 (30302) UV Protectant Spray https://a.co/d/e73zIAQ

If your Domes are still soft and pliable you can get the yellow out by applying some heat with a blow dryer, but on low and from a distance at first, constantly rotating the dryer to spread heat evenly and lightly until they start to go clear. This isn’t for the faint of heart, and you do it at your own risk LOL! But it does work!
Good Luck!
Is this supposed to take a very long time?
I tried it for a few minutes and there's definitely some improvement.

PXL_20230108_045752359.jpg
 
Both of them definitely have that mesh visible again. Will it keep getting better if I do this for like an hour?

PXL_20230108_052228895.jpg PXL_20230108_052311859.jpg
 
I went to town on them another time and I'm absolutely blown away by how nice they look now. Like new! Unbelievable.

PXL_20230108_075028906.jpg PXL_20230108_075103082.MP.jpg
 
When I was rebuilding Polydomes I would apply 303 Protectant as a final step. It reduces damage from UV, and protects plastics.
303 (30302) UV Protectant Spray https://a.co/d/e73zIAQ

If your Domes are still soft and pliable you can get the yellow out by applying some heat with a blow dryer, but on low and from a distance at first, constantly rotating the dryer to spread heat evenly and lightly until they start to go clear. This isn’t for the faint of heart, and you do it at your own risk LOL! But it does work!
Good Luck!

I ordered some of that stuff. I wonder if it will help them stay clear longer after the hairdryer treatment?
 
I'm seeing now that it definitely doesn't last. It's already on it's way turning yellow. I ordered the Meguiar stuff.

By the way anyone seen / used these?

https://www.ebay.com/itm/204109670078

They look to be the same or similar to the ones @engelder2 and I are using, He is offering them a DIY kit with complete instructions and I am offering a full service option.

EDIT: I have been informed by my colleague that these are not the same domes we are using. They may be the harder plastic ones that have been around for a while.
 
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We aren't really set up as a business. More sort of offering this as a service to the Infinity community. You can private message me at @seifreit or Mark at @engelder2 for more info.
Ok cool! I sent @engelder2 a PM. I've seen some videos, this looks doable to perform myself.

I'm going the Meguiar route first but it would be good to have this kit around for the future and / or in case the Meguiar doesn't work very well for me.
 
Well I did the Meguiar thing. WOW!!! They look like new. Mine are also still perfectly pliable so I'm guessing it's gonna be a while before I'll have to use @engelder2 's kit. I did order one to be "future proof" because these speakers are serious keepers!

PXL_20230114_034853780.jpg PXL_20230114_034903739.jpg
 
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