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Multi-Way Conventional loudspeakers with crossovers

TDL Studio 3 restoration
TDL Studio 3 restoration
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Old 25th September 2011, 03:37 AM   #1
droeftoeter is offline droeftoeter  Netherlands
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Default TDL Studio 3 restoration

It's about time i post something after 7 years of lurking on diyaudio.

A couple of weeks ago i adopted a pair of TDL Studio 3 transmission line speakers from a good friend of mine. They had been stored in a slightly moist basement that smells of oil and they weren't improving on it.. I was more than happy to offer them a new home although at nearly 30kg each it was quite an effort to get them moved!

Now that i've listened to them for a while on an Accuphase amp from the same 80s era, i must say that i'm pleasantly surprised by the sound of these units. The drivers are of absolute high build quality and implemented in a d'appolito layout powered by a 2-way filter. Sadly the cabinet had been painted over in the past and was dented and scratched from storage. I'm currently working on a new coating.

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Not sure what's going on with the pritex here..

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Removing the old paint which was loose already in some places.

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The wood veneer underneath the black paint didn't come out good enough to restore it so i put it in primer. Now i'm applying a nice white finish. Bottom side and the foot are black so it won't look that "dirty" over time.

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Next on my list are upgrading the internal wiring and giving the filter a proper upgrade with high quality components. Since i don't have the exact values of the original components i have to measure them individually. The caps have been replaced in the past and are confirmed to have slightly different values due to availability. Current reverse-engineering put into a drawing below. L1 still unmeasured. More on this later!

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Old 25th September 2011, 03:42 PM   #2
David Gatti is offline David Gatti  Australia
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Nice find ! Certainly looks like an excellent design and your refinishing looks great.
They look like Seas woofers.
How's the quality of the crossover components?
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Old 25th September 2011, 04:50 PM   #3
droeftoeter is offline droeftoeter  Netherlands
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All drivers are TDL branded, the woofers have "electric acoustic industries ltd" imbued in their frames. As for the original filter components, they were basic cement resistors and a small air coil inductor with ~0.7mm wiring. It measures 0.9ohms which is a bit high i guess. The caps have been replaced by MKP ones, i'm sure they weren't that high grade originally.

My goal is proper quality series components, MKP+ for the high along with a MOX and a good low resistance air coil for the low frequencies, depending on its mH value i still have to get measured. Parallel part in low can remain MKP cap and a cement resistor.
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Old 25th September 2011, 11:08 PM   #4
David Gatti is offline David Gatti  Australia
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Here's the Seas CA15RLY I was thinking of, which has an excellent reputation.
The TDL may be a rebadged version of this.

H1216-08 CA15RLY
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Old 26th September 2011, 12:06 AM   #5
droeftoeter is offline droeftoeter  Netherlands
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Not sure, it's hard to find any good information about these speakers! Also there appear to be multiple versions of the Studio's. Made a typo in my last post; it's Electro not Electric.

Originally known as Transducer Developments Ltd., TDL was founded in the 1970s as a joint venture between IMF Electronics Ltd. - famous for its transmission line speaker systems, and Electro Acoustic Industries Ltd., - ELAC - one of the UK's leading commercial loudspeaker drive unit manufacturers.
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Old 9th October 2011, 02:54 AM   #6
droeftoeter is offline droeftoeter  Netherlands
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Updated the filter image in the first post for those looking for the original values. The project is finished and i can finally enjoy my music again
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Old 14th February 2015, 11:22 AM   #7
gert75 is offline gert75  Belgium
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hello,
I've just collected TDL Studio 3's and wanted to upgrade the crossover as well.
Unfortunately, I can't find any scheme on the net.
You said you updated the original values for caps in a picture above, but I can't seem to open it.....
Would you be so kind to upload it once again?
Thank you.

I think these are great speakers, also have IMF TLS 50mk2 which are upgraded.
Big fan of IMF and TDL....
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Old 25th November 2017, 12:43 PM   #8
ThetaII is offline ThetaII  United Kingdom
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For information - Studio 3 mk2 owners will find the crossover unit directly behind the binding posts on the rear of the speaker and not behind the lower bass/mid driver as shown in images on the net - which I guess are from version 1?
You will find 4 caps on the crossover - 2x 5uF caps, a 4uF cap, and a 12uF cap. Please correct me if I am wrong or if you find Mk1's or MkIII's have a different setup.

Last edited by ThetaII; 25th November 2017 at 12:53 PM.
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Old 27th November 2017, 10:28 AM   #9
ThetaII is offline ThetaII  United Kingdom
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Photo of TDL Studio 3 mkII's crossover in proccess of cap upgrade
TDLS3crossover.jpg
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Old 10th December 2018, 08:39 AM   #10
ThetaII is offline ThetaII  United Kingdom
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Original crossover components and values (as measured by my meter) shown in attached diagram
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File Type: jpg TDL_studio_3mkII_original_values.jpg (113.6 KB, 50 views)
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