Discussion
What advantage does a split supply give an audio output stage?
Answer: B
With equal positive and negative rails the output idles at earth potential, so the loudspeaker connects directly and the large output capacitor with its cost, size and distortion disappears. Dissipation and efficiency are unchanged, and smoothing is still needed. Removing a component that was there only to correct a standing voltage is a clean improvement, and it is why nearly every modern amplifier uses two rails.
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