Transmission line speakers!

ditusa- Yes and the L65 has the 6 in front of the 5 instead of behind it like in the L25. Good catch. Anyway thanks, I was wrong about Jubal don't know where that came from they were L25 Prima. The L26 was the wood cabinet version of the L25. Same speaker, different cabinets. Both had 10" woofers. The L25 is the ugly one you buy when your paper route earnings aren't enough to afford the nice wood one. Thanks for reminding me how much I was willing to sacrifice if it would get me a good stereo. 

People think Tekton are ugly. They have no idea. Bright yellow and orange, ugliest speaker ever.

http://www.lansingheritage.org/html/jbl/specs/home-speakers/1972-l25.htm

I'm not familiar with any transmission line speaker Infinity made.

Infinity Column and Column II, QLS-1, Quantum-2, 1001A, to name a few.

I owned TDL large monitors, bought the same model twice, and loved them. Great subterranean bass.

Infinity Column and Column II, QLS-1, Quantum-2, 1001A, to name a few.

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None of them were. They were Line Source. QLS. Quantum Line Source.

They were a hybrid at that. Then only the QLS1, kinda. It wasn’t a true LS speaker not TL. It was a big ol box.. That’s it..

A transmission line uses an internal partition to lengthen the path from the rear of the driver, to the port. The sound is transmitted through the length of the path and in doing so tunes the box.

There are no folds, much less bracing in any of the Infinity boxes. Just a big ol box, nothing fancy at all.. Veneers. :-)

This is the inside of a transmission line.

You can see the mids and tweeter would have to be an enclosed design to share the same baffle and port for tuning. That hole in the back, I’m sure that is for the binding post. The space on top is tuning the box, adding bracing and reducing resonance issues with the long section of the throat. The long run in the back we use to put shag carpet.. Now NoRez on the back only. Maybe 10" of the port exit.

Every corner would need batting. This is a serious build, they did a good job smoothing the throat. See how they rounded the corners. They are not just left square. Double front and bottom it looks like, too.

Regards

They use a passive radiator on the bottom to tune to box.. Still a port.. I've tuned these with putty, add and subtract the mass on the bottom.. Quite effective per room and amp.. (Q)uality tuning.