Hello all -
(Hi Geoff, hope you are well!)
First post here - very happy to find you guys!
I've just picked up a pair of TDL Studio 4s - Very excited! Cosmetically they're in great shape and the drivers all appear to be in pretty good condition (there's even a spare mid and bass units) - but they're very bass light (I'm guessing the bass drivers on both sides are down around 6 dB)- I'm thinking that as the drivers themselves all appear to be working OK and moving freely, this may be something to do with the crossover. Might need new caps?
There was an annoying rattle coming from the back of one of them which I tracked down to a loose nut on the back of (inside the speaker) one of the terminals - However - as I was removing the terminal panel, the internal wiring broke off of a couple of the terminals - I have to say, the quality of the soldering job was absolutely dire, which made me start to wonder what else was going on "under the hood" - Also, it surprised me to find that the wiring from the terminals to the crossover (all the wiring in fact) is solid/single strand wire - is this normal on a TDL of this era? My Studio 0.75Ms certainly aren't like this
I took the bass driver out to have a look at the crossover (again, the very poorly soldered single strand cable broke straight off the driver as I was carefully moving it away from its' orifice.)
Anyway - the crossover is very home-made looking - a piece of MDF with components soldered to what look like nails. Apart from the inductors hanging off by their wiring, does this look normal to you guys? I've not a huge amount of experience with vintage hifi, but I was expecting something a little more "manufactured" looking - again, the crossovers on my Studio 0.75Ms don't look like this.
I've had a look online and can only find one image with a wiring diagram for a Studio 4 crossover... (although it does say TDL Electronics
Monitor Studio 4? which isn't a model designation I had come across, I am assuming the implication is that this crossover set up is applicable to the Studio 4 and maybe the 3-way version of the Monitor/Monitor Compact that was sold in Europe?)
http://www.cma4ch.org/chemo/image/hifi/TDL-Monitor-Studio4.png
The layout and values differ substantially to what I'm looking at here....
By any chance, does anyone have a wiring diagram for the TDL Studio 4 crossover? Or any idea where I might start to look? I've googled it to death and I'm getting no-where. If I'm going to rebuild the crossovers from scratch I'd like to be sure I've got the right components/values.
many thanks,
Dan