How To Design LoudspeakersI am going to explain the wattage as it is used by speaker manufacturers to describe their transducers. The speaker wattage is probably one of the first things that you will notice when shopping for speakers. If you are building a complete loudspeaker then you most likely are going to get some woofers, some mid-range speakers as well as a tweeter, depending on your box.
Woofers usually will need to have the largest wattage as most of the signal energy is being consumed by them. Mid-range speakers require much less wattage than the woofers. Similarly, the tweeter requires the lowest amount of wattage. Let's say you want to design some cordless rear speakers. Rear speakers in general do not have to have to have huge wattage. You should be fine with 20 to 100 Watts overall wattage. If you are designing a two-way 50-Watt speaker then the woofer would probably be 40 Watts and the mid-range speaker would consume in the order of 10 Watts.
In case you are building a 100-Watt 3-way speaker then the woofer would consume around 60 Watts, the mid-range speaker around 30 Watts and the tweeter around 10 Watts. You can scale the above numbers depending on your overall speaker wattage.