Originally Posted by LTD02
something that was missed in that paper is performance at the extremes. two designs may be equally efficient, but the one with 2mm xmax is going to run out gas long before the one with 38mm xmax.
bfm keeps suggesting that distortion is related to excursion. is 10 mm excursion the same in an eminence driver as it is in an lms? i think not.
There is no comparison between under hung short coil drivers that have a short bell shaped Bl curve, and more often than not, a suspension that leaves lots to be desired, as compared to something with a 10-11" diameter spider / 4" coil, textbook linearity of Bl, inductance et. al. over a wide range of throw.
Since the talk is of distortion, and how it rises out of the stratosphere with regards to excursion, I'd like someone to classify what type of distortion it is, so we can all learn from it.
Is it: odd or even order distortion, or is it frequency modulation distortion from a wide bandwidth + high excursion? ( also called IMD )
If it's IMD you are talking about with regards to excursion, no problem, cut the bandwidth of the device.... instant reduction of this distortion.
In horns, there can be many types of distortions, small compression drivers driven to higher levels have a very high throat resistance and the air that's squeezed between the phase plug and the diaphragm can act in a non-linear fashion.