TDL Speakers - Pls. Read & Share Your Thoughts

I have the XO schematic and other documents on the RSTL. A good resource for parts for the RSTL is DHS Speakers in Saginaw, MI. You should be able to source anything you need from DHS. 

Are yours the original RSTL's or the later RSTL-M?

Hi all,

Hi mre28m5 - is that a reference to the old BMW? My favourite car ever, wish I could find a good one of those!!! I had a couple of e28 M535

I digress.

I recently bought what I though were a pair of TDL Studio 4 - but I’m told I actually have a pair of TDL Studio Monitor M - which is not a model I was aware of before, and I am finding it hard to find information on the net about these - Apparently they were released at the same time as the "M" revision of the RSTL. They are a 3 way, very similar looking to the Studio 4, but with a metal midrange driver.

Anyway, they have had a somewhat chequered history. The crossovers have been replaced with something home-made, for whatever reason, and the bass drivers are currently running about 6dB down, so I am running them bi-amped so I can separately control the level of the bass driver. I would love to return them to original spec, but its very hard to find info. Does anyone here have circuit diagrams for the original crossovers on these?

My bass drivers are Elac 3021GT 01 (8Ω) - I was expecting these to be GT 03 (6Ω) as per the spec of the Monitor and Studio 4? Does anyone know what the correct driver should be for these?

The mids are unmarked but share the same chassis as the bass drivers in my 0.75M - so they are an Elac unit and do have the correct metal cones - but they do not have the phase plugs as shown in the original launch brochure, instead they have a generic dome dust-cap. Not sure whether this is the result of a repair, or a later revision to the spec of the drivers.

The HF drivers are Vifa D25AG-67-06 (6Ω) - which I am assuming are replacements, and possibly the reason why the original crossovers were replaced??? I was expecting to find some variant of the Elac 25DT, like the rest of the TDL Studio & monitor range. But if anyone can confirm what the correct driver should be, that would be helpful.

If anyone has any info which would help me restore these back to original spec I would be very grateful. Elac 25DTs are hard to come by, but not impossible - but I really need the circuit diagrams for the original crossovers so that I can make a pair. (or the crossover for the RSTL M, I might be able to extrapolate)

many thanks,

Dan

Hello Dan,

I started this thread 14 years ago, it seems so long ago. My systems have gone through numerous changes but happy to say the TDL Studio Monitors are still with me! I still like them as the day I brought them home and they are still in excellent shape after all these years. They are truly speakers for the long run.

Regarding the bass driver I can confirm the model is 3021 GT03. As I understand they will be very difficult to come by. I believe the KEF B139 driver is a direct replacement. TDL has improved the performance over the B139. I am afraid I don't have any information on the crossover circuit diagrams to share. The TDL Studio Monitor 'M' speaker, the fronts of the speaker is also vineered as the sides where as the Studio 4 it looks black. I presume yours is the former with front veneer. 

I came across some information on the TDL's on AVS Forums, you can have a look. You can also contact Falcon Acoustics for suitable replacement drivers. Falcon also has a white paper on the driver specs. 

I hope you will be able to restore the speakers back to the original condition. They are worth the effort IMO.

If you come across any more information please do post it here for the benefit of other TDL owners. I wish you best of luck with the  restoration!