Telefunken OB's finished - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th August 2005, 02:29 PM   #1
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
Smile Telefunken OB's finished

Hi all,

it's been quite some time since I posted the last time....
Well, my new open baffles are finally finished, the carpenter really took his time...%&"!!

This is my interpretation of the theme "transparent baffle", sort of juggling with baffle area and esthetic "impact". They are now 120 cm high and around 60 cm wide, including the wings. The wings are made from 10mm plexi (isn't that lexan over in the US?) and attached with small dowels (?), the baffle itself is 19mm pearwood.

To have the possibility to try different drivers and to NOT have holes in the front I came up with a mounting device made from 5mm aluminium that also allows different clamping forces of the driver from zero to destruction .

Drivers are the venerable Telefunken 8"ers from 1953 with the big magnet and Saba tweeters. The lower Qt of the Telefunken makes for a slight rollof to the lower regions, but with my closed subwoofer for the bottom bass quality is outstanding...very fast and no booming whatsoever!
Sound quality overall truly is the best I ever had....very easy and reveilling, you are sort of looking into the music!!

regards,
Oliver
Attached Images
File Type: jpg p1020248.jpg (98.2 KB, 787 views)
  Reply With Quote
Old 17th August 2005, 02:31 PM   #2
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
Default backside

rear
Attached Images
File Type: jpg p1020237.jpg (99.1 KB, 716 views)
  Reply With Quote
Old 17th August 2005, 02:32 PM   #3
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
rear2
Attached Images
File Type: jpg p1020241.jpg (93.4 KB, 629 views)
  Reply With Quote
Old 17th August 2005, 03:09 PM   #4
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
You, good sir, have yourself a fine project there. But you didn't need me to tell you that, did you? I keep wanting to try a proper OB project, but the present room is too small to pull them much more than a foot from the room boundaries. Pity -I love the freedom from all boxiness you get with the dipolar (and bipolar, come to that) sound.
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 17th August 2005, 03:13 PM   #5
diyAudio Member
 
biarritz's Avatar
 
Join Date: Oct 2004
Stixx,

I love your woodwork and the mounting device. I realy would like to hear those beauties.

I have also a pair of Open Baffles which are still under development.

I use Richard Allan CG8t (1973) or Philips 9710m (1971) drivers.

The baffle size is 120cm x 40cm, but I also want to add some wings to the back of the baffle.

I have two BR subs which are integrated in the lower part of the Open Baffle and a digital crossover to experiment with the frequencies. Each sub uses two 6.5" drivers. These are just temporary drivers.

At what frequency do you cross with the sub and what kind of sub do you use?

Low Budget Pat

Grt,

Patrick
  Reply With Quote
Old 17th August 2005, 05:38 PM   #6
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
Hi Patrick,

I only have one sub that I built 4 years ago. It is a closed cabinet of 39 litres using an Alumapro Alchemy 12" as driver. This is an awesome driver with perfect TSP for a closed cabinet. Power comes from a Hypex HS 200 (which is manufactured in your homecountry...).
Xover frequency is at around 65Hz, and extends down to 28Hz or so....

Groet,
Oliver

PS Nice headamp you got there....I am currently building the Morgan Jones!
  Reply With Quote
Old 17th August 2005, 07:01 PM   #7
diyAudio Member
 
Join Date: Oct 2001
Hi Oliver,
nice cap you have in your highpass section.
What typ you use for it. I mean the tube.
Greetings,
Andreas
PS: Really wonderfull design and workout.
  Reply With Quote
Old 17th August 2005, 07:18 PM   #8
Ropie is offline Ropie  United Kingdom
diyAudio Member
 
Ropie's Avatar
 
Join Date: Jul 2003
Location: SW London
Oliver, they look excellent! What is the purpose of the tube on the back?
__________________
"A squid eating dough in a polyethylene bag is fast and bulbous, got me?"
  Reply With Quote
Old 17th August 2005, 07:42 PM   #9
Stixx is offline Stixx  Germany
I am
diyAudio Member
 
Stixx's Avatar
 
Join Date: Sep 2003
Location: Southern Germany
Default tube

Andreas, Ropie,

the tube on the back acts as vacuum cap, I think its an ECF 80 from Telefunken. To try that was suggested to me by Holger Stein from steinmusic.
Although the cap has only a few pF between the plates (?), it audibly improves transient response and resolution of microdetail.
Now those vintage Saba tweets have amazing resolution and natural timbre (how I love all those important words... ), short... it sounds bloody good!

best regards,
Oliver
  Reply With Quote
Old 17th August 2005, 08:31 PM   #10
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Nice work Stixx! The open-baffle army is growing each day!

And it's amazing how many variations on this theme there are!

Could you explain this vacuum cap circuit to us a bit more please?
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Oh man, my telefunken stoops... Cassiel Tubes / Valves 14 20th October 2005 05:23 PM
Telefunken TR-1500 anatech Solid State 7 15th October 2005 09:13 PM
Telefunken? Swalabr Tubes / Valves 7 19th June 2004 07:26 AM
Telefunken Tuner/amp coffin Analogue Source 0 4th April 2004 01:34 PM


New To Site? Need Help?

All times are GMT. The time now is 12:18 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2