Transmission line speakers!

A lot of Mark Audio full range drivers use Mass Loaded Transmission Line (MLTL) speaker enclosure designs to optimize their bass response. They are modern designs that more resemble bass reflex boxes in appearance with a duct at the bottom of the cabinet.

@roxy54 u welcome, it was a chance to relive my youth…..

bkeske,

I don't think that Vandersteen ever called any of his speakers transmission lines, and having a slot vent doesn't make them one.

mrdecibel,

The Khorns were nothing like a transmission line, they were just a horn loaded bass driver.

I started designing Transmission line speakers in the mid '70's. They can be real good for the money. These days I use a ported cabinet design because you can get a better final performance curve.

I own T+A Criterion 2100 TL speakers.  I believe all the T+A Criterion speakers are transmission line.    Very deep, natural and linear sounding bass for midsized floorstanding speakers.  Never boomy, even in my room with hardwood floors. 

If they are in your price range, I'd take a listen.  I think they have one of the best transmission line designs.