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