Yes the cone does move freely , One thing I noticed was that the alpha 10 was louder in the bass and lower midrange ,both tested in Pi-3 box tuned to 46 hz. the port was different size in the 12lfa box to make up volume of horn and woofer displacement. the a-10 vifa and crossover came from Pi-speakers, the 12lfa came from the factory in Kentucky.the x-over had the 20 and 30 ohm series resistors on board. Tone wise the 2-Pi was better. when I used a Kappa 15lfa the tone was very near the 2-Pi. The volume was as expected with the kappa 15lfa but lower then expected with the Delta 12lfa. Thanks for your reply.