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Curcuits like this can be seen very often on Youtube electronics channels (mostly hailing from India/southeast Asia) boasting with clickbaity titles like "1000W bass amp". They use an impressive array of big power transistors so it's gotta be powerful, right? Well, no.
The most obvious flaw is that there is no way of keeping the DC offset from going through the speaker (represented by 8ohm R + volt meter here). This drastically increases distortion and can even damage or destroy small speakers. The 1000 watts claim is obviously BS since they use supply voltages of 10-20 V and they couldn't suplly 1000 watts into an 8 ohm load even if connected directly. Also, the gain of this curcuit is far too low to transfer a line signal to a 1000 watts signal. And in this extremely inefficient class A arrangement the heat created would be immense.
This curcuit is designed to scam you. Instead of the transistor array, a single high gain transistor is not only enough to achieve this functionality,
It would even be better (lower input impedance). They also use tiny heat sinks which would be way to ineffective if all transistors would be fully loaded in this extremely inefficient class A arrangement. They also add unnecessary components like inductors to make their curcuit look more impressive.
Their goal is to generate ad revenue, most of these videos have at least five ads, they don't care if you waste money and time or even damage your equipment with this nonsense.
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