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I don’t know what to expect, which is why I would like to try. I have an excellent set of conventional ported speakers, some sealed horn-loaded speakers and now I have another location for a system so I’d like to try a different design. I guess I’m hoping for a big, thumping, forceful kind of sound.
Stevethecoffee-
My impression over the years has been more insistent bass with detail and strength that matches the mids and highs. So you don't really feel pounding bass but the bass volume is there.
I'm using a ported design on my main system these days but that's just because I don't have an equivalent quality TL pair. The largest pair I've heard for many hours are the PMC LB1, they are half the size of the ones you've pictured but delivered good bass and low frequencies.
PMC are pretty fussy about drivers and crossover components though, so I wonder what you're getting for £120.
Airhead
I'm a pretty big fan of transmission line designs especially in smaller speakers. These look on the surface similar to PMC designs but the design and build quality of the transmission line would be paramount.
What are you hoping TL will give you?