Difference between low impedance and high impedance speakers?

Speakers are designated as either low- or high-impedance types. Low impedance is in a range of approximately 4 to 16 ohms. Low impedance speakers are used in various sound systems such as household stereo system and car audio system.
High impedance usually means an impedance of several-hundred ohms to several-k ohms. High impedance speakers are mostly used for business or commercial application such as public address. High impedance speaker is used in this field because it has the advantage of being able to:

* Receive audio signal sent from the amplifier over longer distance, at an adequate level
* Be connected to the amplifier together with a number of other speakers

The high impedance speaker is connected to an amplifier of high output impedance; and low impedance speaker to low output impedance amplifier. Ideally, the output impedance of the amplifier should be identical with speaker impedance.
Connecting the low impedance speaker to the high output impedance amplifier causes impedance mismatching, resulting in amplifier malfunction or damage.