Transmission Line Subwoofer

[MidnightSensi]

Anyone built one? What's the theory behind it? I've been googling about transmission line speakers, but, not really seen many subwoofer projects.

I know my M&K S-150s have a transmission line tweeter, but, I'm not really sure what the inside of the enclosure looks like.

What would a subwoofer look like? What would the output be like? Whats the disadvantage/why don't manufacturers use them more?

 

[lsiberian]

Anyone built one? What's the theory behind it? I've been googling about transmission line speakers, but, not really seen many subwoofer projects.

I know my M&K S-150s have a transmission line tweeter, but, I'm not really sure what the inside of the enclosure looks like.

What would a subwoofer look like? What would the output be like? Whats the disadvantage/why don't manufacturers use them more?

I think the idea is to lengthen the port to an incredible length eliminating that the open end energy is completely lost. Though some TLS are designed to simply take the wave far enough to put it back in phase with the original wave.

Still designing that type of sub would likely take an incredibly long line. And likely take a large box. Of Course our resident expert on TLS designs as his name clearly shows. Is TLS Guy. He would likely be the go to person on such a design.

I suppose if you want an easy way to do it. You could always do I pipe to the ceiling. Of course it's not worth sleeping on the couch for IMO.

In some ways the Kappa Design takes some TL principles in that it is a very long vent. I suppose if one bounced back the line enough you would get to a TLS like Design

 

[t3steve]

Here ya go

http://www.nulltime.com/DIYAudio/subwoofers/patl/patl.html

 

[lsiberian]

Here ya go

http://www.nulltime.com/DIYAudio/subwoofers/patl/patl.html

That's crazy