Transmission Line Speaker – Build Plan


Build these Transmission Line Full Range Speakers by downloading this detailed 23 page plan that will show you how to go about it. The plans provide you with detailed step-by-step instructions and a list and links to tools, parts and materials that you will need. This Build Plan is intended for the intermediate builder.

*Build plan dimensions are given in millimetres.



When following this build plan, the end result should give you speakers that will have the following approximate specifications:

Drive Units:

  • Full Range Driver: 4 inch Titanium Cone driver from Tang Band

Enclosure Description:

  • Transmission Line box system

Frequency Response:

  • -3dB at 49Hz and ±3dB from 800 to 20000Hz on reference axis


  • Approximately 87dB

Nominal Impedance:

  • 8 Ohm

Recommended Amplifier Power:

  • 25 – 50W into 8 Ohms

Dimensions (without spikes):

  • (W x H x D): 140 mm x 900 mm x 180 mm

After initial listening tests, I can attest to the claim of better quality bass performance and a spacious soundstage of a Transmission Line speaker. The Tang Band point source full range drivers are truly very well designed. The speakers disappear and you and you are left only with the music. These came out better than I initially expected, and honestly, I find myself listening to these speakers more and more. Even with a moderate bass response, the sound is full enough not to fire up the subwoofer to fill in the low end. A very balanced, detailed and well rounded sound indeed!

Watch the build video above.