What are the Hemisphere's speaker specifications?

The Hemisphere’s drivers are Polk Audio’s db521 fullrange car speakers. They are wired in such a way as to be compatible with 4-ohm or 8-ohm amplifiers. Each individual driver is rated at 45W of continuous power handling, meaning that each channel of the Six-Channel Hemisphere can handle 45W, while the Monaural Hemisphere can take up to 270W. Full specifications of the drivers can be found on the Polk Audio website, here.