Differences Between Folded Horn Speakers and Transmission Line Speakers

@raam RV's are 'tiny homes' that just happen to be mobile....*s*
We still have our 34' Safari that I'd tried various audio abstractions within....built prior to slide-outs which 'simplify' wiring but still makes 'near field listening' a given.
'Real estate' (sq. ft.) is what one doesn't have, the pre-installed audio is usually a bad joke, and the cables are basically 'zip wire'....

Go class D amps; the smaller the 'upstream' the better.  Everything onto a laptop as poss.....  Have the quietest genset or your batteries will not have enough for dinner or even the late snack....and morning java will require propane if you're 'dry' camping. 

Forget 'room treatments'....think 'the space as oversized headphones' and you'll be less frustrated.... I never tried 'room eq' as it would be overkill and another thing to take space you don't have.
Best I could manage was a pair of ESS amt's and a pair of 6'' woofs in the kick of the driver and shotgun seat spaces....The dash player did broadcast and CD's.

You have to....No, Will give a pass from 'phile to Practical....

...unless you've a Prevost or the like.  And, even then, a good pair of b/t headphones will be your biggest friend.

Good listening and luck, J

Are building the kit or building the cabinets from scratch?   That looks like quite a project from scratch.  These speakers sound very lively and nimble and deliver much more bass than one can normally expect from a single, small, driver.  Bigger versions with 8”-10” fullrange drivers can be so good that they can compete with any design.

Good luck on your project, it looks like fun.

I would have to build from a kit. I don't have the tools to build from scratch. I wish I did. Still, I think it has the potential to be a rewarding project. I'm looking forward to it. 

Transmission lines have the reputation of excellent deep bass, but they are also very, very inefficient.  They need a big amp.  

Iʻm not fond of those transmission line designs that have only an 8" bass driver, or even two of them.  You need surface area to move a lot of air.  Thereʻs no replacement for displacement. 

Just because you donʻt have the tools to build from scratch doesnʻt mean you canʻt do a project.  Go to any local cabinet shop with a diagram of what you want and they can cut the parts for you.  They could also assemble the enclosure for you if you need it.  It wonʻt cost as much as you might think.

As for horns, the enclosure stops acting like a horn based upon the size of the horn mouth.  The lowest frequency that it acts like a horn is based upon the quarter wave length. If your horn mouth is 3 feet across, then that quarter wave length is:

The speed of sound
===============
full wave length

The speed of sound is 1100 ft/second.  If the horn mouth is 3 feet, then the wave length is 12 feet.   1100/12 = 91 hz.   The reason that Klipsch made corner horns is that they use the room corner as part of the horn.  Thatʻs how you get a horn mouth that is 8 feet across, which is the quarter wave length at about 34 hz.

@russbutton That is interesting information. The people in these forums are a wealth of information. Thx.