Subwoofer amplifier 100W output with Transistor

It is a circuit diagram of a subwoofer amplifier transistor fully used as the main amplifier, which can produce an output of 100W. There are seven transistors including four in the output stage. 





Transistors Q1 and Q2 BC108 form a preamplifier stage. Transistors Q4 to Q7 form the output stage. Because no ICs are used circuits that extremely powerful and can be easily assembled on a common