KEF vs TDL drivers

[Moondog55]

Still looking for that other pair of B-139's at a reasonable price.
Does any body know what the model number for the later driver is?? and when did manufacture change??
TDL looks like they may be starting up again
http://www.tdl-loudspeakers.co.uk/driver_tech.htm

link to driver
http://www.tdl-loudspeakers.co.uk/pdf/bi_driver.pdf
Any clues to changes in parametres ?? also if this driver is so good ( awful cone break-up at k1.5 for the SP 1044, not-withstanding) why did manufacture stop??
I like the driver as much for the narrow profile as anything else, What would this driver sound like if remade using modern technology?? i;e: vented voice-coil, shorting rings extended pole piece etc:

[DAMIC]

Hi,

The big TDL speaker from the first link I sow a long time ago, 1990 at Fremantle Hi-fi show, W.A. The bass driver is different from Kef B-139 which is flat surface type, but visualy is similar only due to oval shape.

[Moondog55]

Yes the TL page has links to a German kit site but i have been unable to find any information on the actual specs of the driver itself
http://www.aos-lautsprecher.de/deutsch/studio90E.html
This site quotes frequency range down to 17Hz ( at what level??) so i have to assume driver parametres are quite different.
I had always assumed that Elac developed the original Bi-radial driver, if you look closly at some of the later IMF boxes they appear to use this woofer.
I now have two pairs of B-139's so need to make a start on the next box or the wife will slaughter me for spending some of the honeymoon cash on drivers, I was just wondering if there was any information in our extended community on the differences.

[pinkmouse]

TDL were bought a good few years ago up by the Richer Sounds group, and now make very average performing conventional budget to midprice boxes. I suspect the only thing Richer kept was the company name.

[Moondog55]

No body ever went broke catering to the masses, what does the average meat pie taste like??


For all but the Aussies here a meat pie in Oz is like fish and chips in England and hot-dogs in America and I would prefer not knowing what goes into most of them ( I like a good meat pie, haven't had one in years )

But seriously has no-one ever tested one of these to compare to the B-139??

[Moondog55]

Just had an Email, this German company still has a few of the TDL drivers in stock

http://www.aos-lautsprecher.de/

Quick question, if I was to my existing KEF drivers in a sealed box and wanted to lower the resonance a little how do I caculate how much mass to add to the driver??

B-139's have that flat face so it should be relatively easy to glue multiple layers of heavy paper or felt to the front to do so but i would like some idea of how much I need to add

[Moondog55]

Axel just E-mailed me the parametres for TDL drivers if any-one is interested, very different to B-139's

3 versions, GT 01/02/03
01 = 8R/fs 32 / Vas 45l/ /Qts0.56

02 = 6R/fs 31 / Vas 68l/ /Qts0.60
03 =16R/fs32 / Vas 62l/ /Qts0.52
All rated 100 watt (DIN i suppose)