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Telefunken OB
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Old 22nd February 2015, 02:38 AM   #1
giants11214 is offline giants11214  United States
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Default Telefunken OB

It's cold and snowing in Brooklyn, NY, a great opportunity to start a new thread.

I recently built these Telefunken OB speakers inspired by Kevin @ glowinthedarkaudio.com. I think it's extremely kind of him to be sharing his knowledge and experiences. Inshort Kevin helped save me time and money. I just recently started on this diy speaker hobby and new to woodworking, and the reason I choose these OB speakers is that I don't have access to computer programs that are needed to built closed or vented enclosures. I also wanted a challenge in woodworking instead of just using a broad as an OB.

I'm very happy and glad I built these OB's. I built mine to be flexible. The front panels are removable, incase if I want to do 2 or 3 drivers, or even an array of drivers. I also built 12 inch plates for smaller drivers that can be easily swapped. I used half inch plywood, if I built a second pair of these I would go with hardwood.

These OB are very forgiving, just about every speaker I have installed sounded great. Of course certain drivers sound better than others, but just about all of them displayed good imaging and separation between the high and low frequencies. The following are drivers I have used: Fostex FE208sigma, Fe168Esigma, Coral Holey Basket, Elac 8 inch, Akai 10 inch coaxial, Berman 12 inch guitar amp speakers. So far my favorites are the 2 Fostex and Coral's. I absolutely love them with my SS accupahse e202. I also played them on a brand new Decware SE84CKC. Maybe the Decware needs to time to breakin, but it's not sounding as dynamic as the accuphase. Haven't done any A/B speaker tests yet, will report back when I do. I'm curious to see if they sound better or more open then regular speakers, But my first impression is that the bass is not as tight or dynamic as boxed speakers. I'm not a bass junkie anyway, definitely enough bass for me.

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Thanks for reading, would appreciate any advice.

Last edited by giants11214; 22nd February 2015 at 02:45 AM.
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Old 22nd February 2015, 03:20 AM   #2
Bigun is offline Bigun  Canada
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Telefunken OB
Looking good.

For somebody that just started in the hobby you have a rather distinguished set of drivers on hand!
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Old 22nd February 2015, 03:58 AM   #3
planet10 is offline planet10  Canada
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Telefunken OB
Don't know the 1st driver. The Coral Holey baskets should have potential, the FE108 are going to have any bass MIA.

dave
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Old 22nd February 2015, 06:25 AM   #4
misok is offline misok
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It's a very good desing, i have similar OBs and for some time i regret i haven't build it with removable front panel. I run them with Klangfilm L307s but i'm lazy to try older fe103 i have, even if i'm curious about the sound. Please keep sharing your opinions about the drivers in future, as well as optional methods of bass support. some drivers may do it alone nicely, though.

ps- i guess 'telefunken' is just a personal name for the project, but i'd love to see a photo or scan of the authentic drawing, i'd be surprised it really existed.
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Old 22nd February 2015, 06:45 AM   #5
misok is offline misok
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you can make a removable rear panel or various panels to tune the sound further. the 'real' OB should have nothing but the 1.5 - 2m space behind, then you get the 'OB essence' but there are many pseudo-OB speakers like Auditorium 23, Musical Affairs, Ocellia. OK, they are resonant constructions but i mean that rear / bottom porting, etc.

i'd like to build some sort a partial barrier for the back-wave bass energy while retain the OB airiness, not choking the mids and highs. The panel would have some pattern on inside and some holes, it's all about the testing.

i'm not a bass freak either. for many the OB bass support is a must, it's a personal preference of musical perception, much dependent on a genre, but if the recording (of a chamber music or acoustic jazz) is not really anemic, i enjoy not having any support and it's the most detailed and coherent sound i can imagine.
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Old 22nd February 2015, 01:28 PM   #6
giants11214 is offline giants11214  United States
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Quote:
Originally Posted by misok View Post
It's a very good desing, i have similar OBs and for some time i regret i haven't build it with removable front panel. I run them with Klangfilm L307s but i'm lazy to try older fe103 i have, even if i'm curious about the sound. Please keep sharing your opinions about the drivers in future, as well as optional methods of bass support. some drivers may do it alone nicely, though.

ps- i guess 'telefunken' is just a personal name for the project, but i'd love to see a photo or scan of the authentic drawing, i'd be surprised it really existed.
Telefunken is not a name or design I came up with. Kevin at glowinthedarkaudio.com have an original Telefunken OB speaker. I guessed the dimensions and made some modifications.

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Old 22nd February 2015, 01:34 PM   #7
misok is offline misok
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Quote:
Originally Posted by giants11214 View Post
Telefunken is not a name or design I came up with. Kevin at glowinthedarkaudio.com have an original Telefunken OB speaker. I guessed the dimensions and made some modifications.
i know, i meant him but it's the least important thing here. today i've held 103s and begun seriously think about making those rings and trying them .. i'm happy with these 9" siemens drivers but one has to keep trying things i guess.
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Old 22nd February 2015, 01:35 PM   #8
giants11214 is offline giants11214  United States
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Originally Posted by planet10 View Post
Don't know the 1st driver. The Coral Holey baskets should have potential, the FE108 are going to have any bass MIA.

dave
Hi Dave,
Your like the godfather of these Coral Hoely and other various versions. Do you have any experience with them as a line array, 4 speakers in OB? I'm going to try and report back. I guess I'll wire them series and parallel to make them 16 ohms, since the Corals are 8 ohms. Can you draw me a simple diagram on how to wire them or point me to a website that has good info? Thanks.
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Old 22nd February 2015, 01:43 PM   #9
giants11214 is offline giants11214  United States
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Originally Posted by misok View Post
i know, i meant him but it's the least important thing here. today i've held 103s and begun seriously think about making those rings and trying them .. i'm happy with these 9" siemens drivers but one has to keep trying things i guess.
Sure if you are curious. The 103s are light, you can use card broad, doubled up and glued if you want.

If someone in the NYC area that have the famous tannoys and lowthers, I would love to hear them. Please contact me.
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Old 22nd February 2015, 03:00 PM   #10
planet10 is offline planet10  Canada
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Telefunken OB
Quote:
Originally Posted by giants11214 View Post
Hi Dave,
Your like the godfather of these Coral Hoely and other various versions. Do you have any experience with them as a line array, 4 speakers in OB?
Only a pair in BD pipes. They were quite good. These are bipole-like. A bunch in an array willplay louder, but likely they will loose some of their goodness. But try it.

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