Transmission Line Speaker Build

slavedata

Wammer
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Mar 2, 2009
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Bottesford Melton
AKA
Dave Slater
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I have acquired some KEF B200's and T27 1231 tweeters plus some chunky looking KEF 2 way crossovers. I fancy having a go building some transmission line cabinets for these. Can anyone point me at some suitable cabinet designs on the web?

Thanks

Dave

 

DrBoar

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Feb 6, 2012
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HFN&RR had a design very similar to IMF 50 with a KEF B200 T27 and crossover. I would suggest damping the first half of the pipe to reduce the harmonics but keep the rest open to get the most of the fundamental ( the illustration below is more like the bigger IMF TLS 80 but the damping layout should be along the same lines



 

MF 1000

Extreme Full Range 😱
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Apr 5, 2011
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Caego
AKA
Keith
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The best KEF driver to use in as transmission line is the B139 'race track', T27 tweeters are excellent for the top end - what were u planning to use for the mid range?

The classic trio is B139 bass, B110 mids & T27 tweeters. B110 drivers are now quite expensive but equivalents available from monacor ( and falcon audio were having some remanufactured I believe). This trio works well in both transmission line & ported designs too.

For a 'simple' TL design/build have a search for the plans for Cambridge R50 ....pm me if you get stuck as I have them on pdf

 

DrBoar

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Feb 6, 2012
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Slavedata, there were several versions of the B200 with various characteristics most notably Qes. They will work diffrently in a given TLS.

Here are the scanned article for one of the B200 versions. SP1014 probably benefit from full damping and SP1054 will need less damping ( or rahter more of radiation resistance at the fundamental) The SP 1022 SP 1039 and SP 1063 is in the middle and there it depends...

I would leave out any damping material in the two final sections and then have a sheet of BAF to slide into the final section to find out what damping works best. Put the crossover in the base of the speaker, as inside the speaker is a terrible place for crossovers due to the enourmous soundpressures inside the box. If you start using Speakon connectors you will never go back to those other binding posts.

I would not bother with the roofing felt but rather go for 4mm selfadhesive bitumen pads as sold in stores that sell car parts, car hifi and such.









 

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