Klang + Ton RSTL DIY Project

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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:

Fact sheet from RSTL plans in Klang + Ton

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
  • 2 616.5
Back wall assembly
  • 2 1169.5
  • 2 184
  • 2 80
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

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