Speaker Questions

rockerboi

Good day to all. I have some questions regarding speaker specifications:

1. What does RATED POWER of the speaker mean?

2. Why is the impedance of the speaker usually has a value of 4 ohms, 16 ohms etc, when speakers also contain inductors and capacitors in their drivers?

3. What is the definition of speaker FREQUENCY RESPONSE and SENSITIVITY and the differences between them?

I also would like to know:

4. How are the channels separated in a speaker system (eg. stereo or 5.1) ?

5. What are the essentials in designing a speaker(considering the power, voltage, volume-loudness, efficiency, etc.) and how to design?

6.How is efficiency measured?

Thanks a lot