Transmission Line Bass

I have heard very good bass all types of inclosures, including Transmission Lines, as it has been alluded to here already, the line can be quite long and quite frankly, the transmission line enclosure is the toughest to get right. I believe that is the single reason that you don't see alot of transmission lines, but done right, they drive the speaker down...down quite well. This design allows us to get deep bass from smaller drivers.
It is also very difficult to get a great driver that will do very well in a sealed box, but when done correctly, I still prefer a sealed box bass with the proper finished qtc.
Again, "when done correctly" Good Listening, Tim

It seems to me that though it might be possible to build a TL with the necessary dimensions, with or without "stuffing tricks", for most of us, it would be impractical to house, and even more difficult to market. Of course all designs necessitate compromise, and I suppose one could get some measure of the benefits of a TL in a more manageable package.

I have yet to hear a speaker that uses a transmission line enclosure reproduce natural sounding bass. I do think that TL's can produce deep and powerful bass when done correctly, but something about a TL system simply does not sound "right" to me. My current speakers use an aperiodic vent which, it seems, is pretty rare. They produce the most natural bass I've ever heard.

what about the acoustic zen adagios? Are these true T-lines?

Dodgealum,
Its tough for most people to separate what sounds correct, from what sounds like the thing that they're most used to hearing.
While designing, a tragic error can be to use a previous model, OR another speaker as a reference--don't get me wrong, it's almost impossible not to. However, as Michael Keaton said in Multiplicity, 'a copy of a copy of a copy is just not rignt.' Therin lies the danger. I had to, since I didn't happen to have a live band here, use a speaker, and I used the Sound Lab A-1--and its no surprise that my loudspeakers sound was natural, flat, while still musical, as the Sound Labs sort of set the bar in those areas.
However at some point you have to, in your mind's eye, still be able to hear/know what that bass being bowed or plucked, really sounds like, and have a really good sonic memory. All this is my way of asking, 'Does it sound like music, or what you're used to hearing from speakers'...and THAT is a distinction with a difference to me.
Then there's the 'Transmission Line Bass' has its unique sound,' camp. I agree, and I like that sound, and think that in some ways its more natural sounding.
The funny part about bass is that, bass gets its character from the midrange--2,3,4,5 and more octaves above the dominant tone that's expressed by the instrument.
When a double bass's open E string is plucked and 41.6Hz is put out there, it's really 83. whaever, then 166.whatever Hz and 332.Hz then 664Hz thats giving it so much of its tonality. Bass is curiously, or maybe not curiously the most complex aspect of music--partly because it's centered in our human hearing curves center--kind of.
Whatever, just rambling now.
More thoughts...your input(s) have been great!

Larry