Okay, but thermal/power compression comes from heat. The relative low power handling of e.g. the SB75-375 SC comes from it's not very high heat dissipation capacity, because the surface area of the voice coil is small. It will heat up by relative low power, so the power compression starts at lower input power compared to a driver with higher power handling.I didn't say anything about power rating? I said given the same maximum power rating a larger diameter (ie, larger area) VC and motor will result in less thermal compression. Underhung has its own limitations, not the least of which is limited xmax.
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