What effect does increasing the speaker’s input power have on the frequency response curve?
As the input power to the speaker increases, the temperature of the voice coil rises. As the temperature rises, the resistance of the voice coil increases. The resistance is purely resistive, and an increase in this resistance indicates that the speaker’s Qtc decreases.
The following is a simulation of a system with a Qtc of 0.7. From the changing shape of the curves, it can be observed that the higher the input power, the higher the Q value, while the low-frequency roll-off threshold shifts to a lower frequency.
