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CSS Trio8 http://creativesound.ca/pdf/CSS_TRIO8.pdf
It has a linear x-max of 28 mm (peak to peak)
It's Qts is .365, the designer said it can be used for free air use.
Impedance: 8 ohms
Price is about $80
Linear excursion is an indicator of how much distortion will occur...especially at low frequencies less than 40 Hz. The higher the linear excursion, the lower the potential distortion. The lower in frequency you go the more it is true.
Not much power is required at low frequencies to get a woofer to move quite far at ~30 Hz!