Use shielded audio wire; tie all ground wires to a single point (star ground). Input signal level is too high, causing clipping.
In an age of disposable consumer electronics, there is a renaissance in hands-on audio engineering. Whether you are an undergraduate electrical engineering student, a DIY audiophile, or a maker working on a smart speaker, building your own audio amplifier is the "Hello World" of analog electronics. practical audio amplifier circuit projectspdf
in a suitable box, mount the volume controls on the front panel, and enjoy the satisfaction of listening to music through an amplifier you built yourself. Use shielded audio wire; tie all ground wires
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A variable resistor paired with a transistor mounted directly to the main heatsink prevents thermal runaway. As the temperature rises, the bias voltage drops safely.