Figure 2 is the same assembly but the voice coil has now moved 10 mm. This is a typical displacement for a low-frequency loudspeaker. Note that this 10mm displacement has required the spider to rotate thru a 20-degree angle and that the spider no longer is touching the coil form! In order to remain bonded to the coil form, the spider must stretch!
Low Stress (LS)™ Suspension System
The spiders used on several of P Series are extremely large clamp diameter designs and were designed to substantially minimize the stretching found in common spider designs. Several P.Audio Series loudspeakers use these new "low stress" LS™ designs. 15 inches is shown in Figure 4. The LS spider is shown in the yellow color.