Power Capacity
With 200 watts of electrical power applied, the M4's power output at 250Hz is 100 acoustic watts. This output increases as frequency increases, due to lower excursion requirements. While electrical power handling capability is a much more common specification, it tells nothing about how much sound comes out when that power is applied to the device. It only indicates how much amplifier power can be applied to the device without damage.
The electrical power capacity of a loudspeaker is determined primarily by two factors: its excursion limits and its thermal limits (caused by voice-coil heating). Since both vary with frequency, the actual power capacity of a loudspeaker is said to be frequency dependent, therefore being a complex function of frequency.
The power capacity of the M4, by the AES standard, is 200 watts. This 200 watt rating primarily describes M4's thermal limits. At low frequencies, below 300Hz, M4's power capacity will be primarily excursion limited. For voice or musical program material, the 200 watt rating describes the M4's power capacity accurately.
READ ON ABOUT THE M4
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