AH has an interesting article on how a speaker can be destroyed. We all know that it can be done, but it is still good to read this one. Incidentally, the one used for the tests happened to be a 6.5" mid woofer, by Axiom.\n\nLoudspeakers & Power Ratings Part III: The Test Results | Audioholics\n\n\n\nOr just read the conclusions.:)\n\nConclusions\nThere are two ways to kill a loudspeaker; thermal or mechanical.\n\nIn this experiment we destroyed one of these small drivers in each way. The most dangerous and destructive signal used was one composed of a single low frequency tone burst on for 11 cycles and off for 99. Despite this signal containing only 55 watts of RMS power, the speaker failed as a result of the peak voltage, correlating to a power (into nominal impedance) of 1100 watts peak. Peaks of very short duration can serve to destroy a loudspeaker even though they are of such a short duration, they are not able to heat up the speaker significantly. Frequency content and Peak to RMS ratio (crest factor) are critical in determining the potential for loudspeaker destruction of a test signal. The loudspeakers impedance magnitude gives us clues as to the potential harm from a signal based on the variation of impedance with frequency.\n\nHigh frequencies are NOT DANGEROUS to the typical woofer, and the notion that clipped signals of a given RMS value are more dangerous to a woofer than unclipped signals is not necessarily correct. Clipped signals do put a higher percentage of amplifier power into the tweeter or high frequency device, and are therefore more dangerous to multi driver systems or high frequency units. Low frequency drivers (woofers) have very high impedances at high frequencies and are therefore not able to easily draw power from the amplifier at the highest frequencies. Without specifying the frequency content and crest factor of the test signal used, the POWER HANDLING NUMBER IS MEANINGLESS!