Two Subs: Logitech z-5500 and Edifier s730 Bass Test

Logitech z-5500 plays together with the Edifier s730 subwoofer at almost max volume. I just noticed that the z-5500 driver cannot play loud 40-50hz because the impedance goes up to 40ohms when it plays these frequencies,and the power goes down to 20w. And yes it got overheated and started smelling like burning wires exactly like the z-680 subwoofer,so i turned it down before the coil catch fire. Is this a new kind of joke i don&know about,or the overheated woofer drivers is the nature of the Logitech subwoofers? Song: Bass Mekanik by Bass Mekanik.