The series of amplifiers that are used on the television audio, amplifier used amplifier ICs, including the IC:
Third series of the function with the same system, namely BTL (Bridge Transformer Less). By using such configuration we get several advantages, namely no use coupling capacitors or coupling transformers.
Block diagram of circuit in the IC AN7522, AN7523 and TDA2616 as in the image below :
AN7523 amplifier schematic
Schematics for audio amplifier with IC AN7522, AN7523 and TDA2616 Circuit Electronics