A Tesla coil has no speaker. The lightning is the speaker. Every musical Tesla coil is a masterclass in modulation. The coil itself resonates far above human hearing, typically somewhere between 50 and 400 kHz, generating hundreds of thousands of volts at the top terminal. That carrier frequency is completely inaudible. The music comes from switching the entire system on and off at audio rates. How the sound is made: - An interrupter gates the drive circuit, firing short bursts of RF energy - Each burst ignites a plasma streamer that heats the surrounding air in microseconds - The rapid thermal expansion launches a pressure wave, effectively a miniature thunderclap - Fire 440 bursts per second and the air itself produces an A4 Modern singing coils are almost always DRSSTCs, dual resonant solid state Tesla coils. IGBT H-bridges drive a tuned primary tank circuit in resonance with the secondary, and a MIDI interrupter translates note data directly into burst timing. Repetition rate se...