My primary concern was the speaker stands required for the N3S, Danny says that it is best to have a stand that is basically an extension of the baffle, on the same plane as the baffle and all the way to the floor. Aether Audio does this too for the same reasons. I'll try and dig up a few links that explain this better, a little busy at the moment. It is a worthy topic that needs to be reexamined.
Sounds like the N3TL will give even better results than a sealed tower or stand mount, the woofers like to loaded with the transmission line and you benefit from extra sensitivity. You guys with the sealed can always move to a tranny or better stands at a later time.
The question came up when I noticed how much better my subs sounded with the sealed N2X than my ported B&W's. I already knew the 12dB roll off of the N2X is a contributor and Danny confirmed this.
I wonder how the tranny line will work, even at the low XO of 40 Hz. I'm at 50 Hz, 24dB/octave on the sub amp right now, according to the dial and measurements. Wouldn't that be low enough to mesh with a ported design?
Listening to Tool "10,000 Days" right now, lots of fun.