You aren't going to get class-AB 20 Vpp from a 20 V supply rail. Some voltage margin is required. Especially at 20 watts! Also, define "minimal latency, low distortion, and high fidelity." And do you expect to find and use some kind of wideband transformer that meets "minimal latency, low distortion, and high fidelity" over that entire range? I'm especially concerned about 1 Hz transformers, too. The volt-seconds alone....
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