Max current represents how beefy the output stages are but it does not mean the power supply could handle more than 1 channel doing this at once. It's' just a measure if the amps ability to handle difficult loads. Bragging rights, if you will.
Also keep in mind for HT, the center channel has most of the output, surrounds have the least, especially if following the THX model of crossing them all over at 80 Hz.
Also keep in mind for HT, the center channel has most of the output, surrounds have the least, especially if following the THX model of crossing them all over at 80 Hz.