We know a thing or two about ports, their benefits and drawbacks. In passband enclosure you can think of the air in the port as a membrane that is the main source of sound. Compression drivers use compression chambers to increase acoustic resistance and improving efficiency. Air is not really an ideal "membrane" and at least compression drivers suffer from "high" 2nd order harmonic distortion. Some speakers have geometry to reduce turbulence and other chuffing, but they can't escape the inherent properties of air.
My question is: what is the "distortion profile" of a reflex port excluding the sound from the actual driver? This should rather simple to measure. Most consistent results should come from speakers with port on the backside of the box. I myself have only one ported pair of speakers, so I have only one example. I will measure it later.
My question is: what is the "distortion profile" of a reflex port excluding the sound from the actual driver? This should rather simple to measure. Most consistent results should come from speakers with port on the backside of the box. I myself have only one ported pair of speakers, so I have only one example. I will measure it later.
