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Old 10th September 2015, 09:39 PM   #1
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Default Inside of Fountek NeoPro5i

Some pictures:
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Old 11th September 2015, 03:24 PM   #2
Legis is online now Legis  Finland
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Interesting, just ordered these 2 days ago. Were they hard to take apart?

Is only one of the magnets angled/beveled or does the picture lie?

How thick is the felt on the bottom behind the ribbon?

What do you think of the quality of the original 15 ribbon element?
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Old 11th September 2015, 05:29 PM   #3
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Interestingly, the build looks very similar to the neoCD3.5h except for the bevel, which is a round over
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Old 11th September 2015, 09:53 PM   #4
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Quote:
Originally Posted by Legis View Post
Interesting, just ordered these 2 days ago. Were they hard to take apart?

Is only one of the magnets angled/beveled or does the picture lie?

How thick is the felt on the bottom behind the ribbon?

What do you think of the quality of the original 15 ribbon element?
It is very simple to take apart, but I do I would not recommend. You will almost certainly 100% ripped ribbon. As I did. I change ribbon for regular kitchen ALU foil. Measurement of the frequency response was the same as with original ribbon.

All the magnets (4) are angeled from both side. Angle is about 30-35 degres
The felt is about 2mm thick.

I think there is too much volume in the casing (behind the ribbon). When I will have more time, I will add some felt.

There is my project with JA8008 and NeoPro5i: (it is in SLOVENIAN language, but you can use google translate):

www.audio-kontakt.com :: Poglej temo - TQWT Jantzen Audio JA8008 + Fountek NeoPro5i

Last edited by matejsirk; 11th September 2015 at 10:13 PM.
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Old 15th September 2015, 08:52 PM   #5
Legis is online now Legis  Finland
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Received my pair today, they sound very nice and the sensitivity is enough for my 100-105dB horns which was a concern for me a little.

The core material of the step-down tranformer is ferrite, or at least looks like it, which was interesting.
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Old 19th September 2015, 10:30 AM   #6
Sjef is offline Sjef  Netherlands
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I like the attachment system of the ribbon. Should be easy to replace a ribbon yourself. Since this ribbon isn't even folded it should be a piece of cake to make your own out of kitchen foil. I have done ribbon replacements with kitchen alu foil in the past and they sounded exactly the same as the originals and all are still working.
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Old 20th September 2015, 08:51 PM   #7
Legis is online now Legis  Finland
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I made some unscientific compression measurements based on this germanic test here in which Neo CD 2.0 was compressiong the top octace a little: https://translate.google.com/transla...tml&edit-text=


Click the image to open in full size.

I could only measure very little compression, 0,3dB @ 110dB/1m. Neo Pro 5i has bigger magnets, almost twice as strong magnetic flux, higher sensitivity and propably bigger/better step-down transformer which might explain the seemingly very low compression compared to lesser Founteks.

Neo Pro 5i 85dB-110dB/1m in 5dB steps:

Click the image to open in full size.


The response curve does not look right since the tweeter and the mic were both lying on my kitched table during the test. Here's somewhat better measurement (with 500Hz/2nd. order high pass), although in quite echoing enviroment. All published data seems to correlate very well with the actual measured performance. Both ribbons also measure quite identical in all respects.

Click the image to open in full size.
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Last edited by Legis; 20th September 2015 at 08:56 PM.
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Old 24th September 2015, 07:09 AM   #8
Legis is online now Legis  Finland
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I link this also here.

Fountek Neo Pro 5i Steps measurement at 90dB/1m:


Click the image to open in full size.

I have been thinking to add more potting epoxy to the back chamber of the ribbon where the step-down transformer is to immerse the transformer totally in epoxy. I would also like to try some horn for the ribbon at some point, although it's in a small horn already.
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Old 22nd March 2016, 11:07 AM   #9
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Amazing performance! What are the internal dimensions of the rear chamber?
Catalog info states 165mm x 84mm but that appears to be the exterior dimensions.
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