You would like to build a custom speaker system for your cell phone. the signals from the headphone jack are gnd, left channel, and right channel. you find a speaker test tone app that send a constant tone to each channel. turning the volume to its maximum setting, you measure the voltage between the left channel and gnd to be 2 v. you see a similar voltage when you measure between the right channel and gnd. you will be connecting the left channel to an 8ω, 50 watt speaker. you will connect the right channel to another 8ω, 50 watt speaker. connecting the right or left channel, at maximum volume, directly to a speaker only gives: p space equals v squared over r equals 2 squared over 8 equals 500 space m w of power. in a 50 watt speaker, this isn't enough power to move the diaphragm (no sound). assuming we want the speaker voltage to be in-phase with the phone voltage and we want 50 watts of power at maximum cell phone volume, what amplifier topology, gain, and power rails would be required for each channel?