A loudspeaker RL and a DC blocking capacitor CDC are connected in series between {HEAD ~ the output node} of {TAIL ~ the amplifier Ao} and ground 
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A loudspeaker RL and a DC blocking capacitor CDC are connected in series between { HEAD ~ the output node } of { TAIL ~ the amplifier Ao } and ground
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH