Tractrix offers several advantages over the older Exponential, especially in the critical mid-range. That is why the newer offerings use Tractrix.
"All frequencies handled by the horn/driver of the two different horn designs (exponential vs. modified tractrix) are not affected by the same amount. Generally, the lower the frequency, the more audible will be the difference, although the modified tractrix horns also have a wider coverage angle at high frequencies, which will also affect the overall sound. There is math involved and a little physics, but specifically the modified tractrix horn will sound more neutral and have a more consistent coverage angle vs. frequency. It will sound better from a wider variety of listening azimuths and elevations than the exponential--eliminating the "head in a vise" stuff. You can move around your room a great deal more and still hear the same timbre/soundstage."
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