The original RSTL design was published as a kit in the December 1987 and January 1988 issues of the German DIY audio magazine Klang + Ton. I’ve searched all over for the entire article, but so far I’ve only found a link to a photo of one page from this topic on a forum for classic KEF speakers:
http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?p=6854
I’ve copied the picture below to make sure this priceless heirloom isn’t lost. I’ll remove it at the request of the original owner. As you can see though it really isn’t clear enough to make out much of the required information, though after pouring over it for some time, I have gleaned a great deal of information from it:
The "Fact Sheet" from the Klang + Ton plans for the RSTL
My German is not what it used to be – actually I don’t know German at all – so I sat down with Google Translate and came up with this translation of the text:
Fact Sheet
Kit Name
RSTL
Manufacturer
TDL
Construction
TDL/John Wright
Enclosure Type
Transmission Line
Net Internal Volume
Not important for TL
Dimensions in mm
WxHxD 540x1209x492
Number of Drivers
7
Woofer
Ovalbaß (oval)
Midrange
13cm, plastic cone
Tweeter
25 mm, Plastic dome
Super tweeter
19 mm, Plastic dome
Impedance
6 Ω
Efficiency, 1W/1m
Not available
(Power) Rating
Not specified
Recommended amplifier power
Not specified
Crossover
Finished crossover RSTL
Kit price/pair
About 3000 DM
Sales
A. Oberage
Lautsprechervertrieb
Postfach 1562
8130 Starnberg
Bill of Materials
Loudspeaker Drivers TDL
- 1 woofer 128/25, 16 Ohm
- 1 woofer 128/20, 8 Ohm
- 2 mids 130 NS, 11.1 Ohm
- 2 tweeters 25 DT, 16 Ohm
- 1 super tweeter 19 DT 06, 8 Ohm
Crossover
- L1, L2 = 8 mH Iron core
- L3 = 1.1 mH Air core
- L4 = 1.7 mH Iron core
- L5 = 0.25 mH Iron core
- C1 = 100 μF Electrolytic
- C2 = 30 μF Electrolytic
- C3 = 10 μF Film
- C4, C5 = 4.7 μF Film
- C6 = 3.3 μF Film
- C7, C8 = 1 μF Film
- C9 = 0.47 μF Film
- C10 = 10 μF Film
- R1, R2 = 15 Ω
- R3 = 22 Ω, ceramic, 11W
Cabinet Parts
refer to drawing and text
Exterior walls, 20mm MDF, all dimensions in mm, gross
- 1 front wall 1209.5×170
- 2 side walls 1209.5×262
- 2 side walls 1209.5×306.5
- 1 back wall 1169.5×500
Interior walls, 12mm MDF, all dimensions in mm, gross
- 2 MT-Chamber 541×303
- 1 MT-Chamber 500×303
- 1 Divider 500×492
- 1 Divider 500×498
- 1 MT-Channel 314.5×104
- 2 MT-Channel above 553×150
- 2 MT-Channel center 490.5×150
- 2 MT-Channel below 452×125
Use hardwood 15x15mm, all dimensions in mm
Back wall assembly
Damping Material
- 5m Rockwool 38cm wide
- 5 BAF-Wadding, 50×35 cm
- 100g pure lamb’s wool
Other
- 16 Allen screws, M5x50mm
- 16 T-nuts, M5
- 12 Screws, black, 4x20mm
- 75 Screws, 3.5x35mm
- 5m wire, 2.5mm², for wiring
- Putty to seal the enclosure openings
- 1 pr gold binding posts
35.091074
-106.566226