Steve from HiFi Farm: Owning a couple pairs of Ohm F's, i've never heard these speakers refered to as "transmission lines". Nor does their mode of operation resemble anything close to what is typically considered a "transmission line" speaker as set forth in any technical manuals regarding speaker design. I would be curious as to how you arrived at that description and definition ???
Meisterkleef: In a "classic" transmission line, the diameter of the line is equivalent to the driver size and remains so all the way to the exit. As such, a 12" driver would make use of a 12" diameter path and a 12" vent. The Kinetic Audio design is actually a TATL i.e. a "tapered acoustic transmission line". This varies from a "classic" design in that the line becomes smaller in diameter ( tapers ) as you get further away from the driver. This approach causes a slight increase in the "air spring" of the box, making it work a little more like a sealed box than the "classic" TL design.
As to Piet's question about tuning and Meisterkleef's comments about the vent contributing output, i have FELT massive amounts of air being pumped out of various TL designs. Some TL's make use of various amounts of stuffing / damping material in the line itself. The amount and density of the stuffing will not only affect the apparent line length, but the amount of sound that the backwave actually contributes to the output level. As such, one can somewhat tune the line in terms of quantity of output and frequency of resonance. Sean
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