Transmission line speakers!

Many Infinity designs of the 70s were transmission line.

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>

I'm not familiar with any transmission line speaker Infinity made. Hybrid line source all except the Beta Vs I think. They were a true, line source speakers. The QLS1 was a hybrid too. Maybe you got the nomenclature mixed up.. or I missed something back then. Still have a few Infinities. RS2bs, RS4B, 2 sets of the original Infinitesimals. I've sure worked and owned a lot of them through the years..

Transmission Line Speakers are pretty cool actually. Folded box designs are too.

Fibonacci speakers. :-)

Regards

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

<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

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.

INFINITY WTLC WAVE TRANSMISSION LINE

This is the only one that I could find. A wave transmission line. I would have to take the driver out and look. Simple as that. 

I don't see a fixed throat for the exit port. I guess the hole in the back is the port?

They may use TL tech but in the stricter sense of a TL speaker design, not so much. It's like calling a QLS1 a Line source when the only one they ever produced was the IRS Beta V. Everything was not quite the same or a hybrid of some kind.

As far as deep bass, TL make good bass, the problem is like any speaker that has bass in the same box as the monitor section, timing is the issue. With TL designs it's even worse.. One driver doing double duty.. the back wave is slower.

As far as ports, I haven't used fixed ports in 40 years.. Passive Radiator, OB, or IB but fixed ports are Worthless..

Regards