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TAS6424M-Q1: Question about GAIN settings aka. "Peak output voltage/dBFS"

Part Number: TAS6424M-Q1
Other Parts Discussed in Thread: TAS6424

Dear expert,

I have a question about GAIN settings in TAS6424. The datasheet says that "The peak output-voltage swing is also configurable in the gain control register through I2C. The four gain settings are 7.5 V, 15 V, 21 V, and 29 V. TI recommends selecting the lowest possible for the expected PVDD operation to optimize output noise and dynamic range performance". So if I am using 12V for PVDD, it means I should choose 7.5V peak for 0dBFS, right? Or should I choose 15V?

I think if I choose 7.5V peak, I can only achieve about 7W per channel output power by using 12V PVDD, 4Ohm speaker, right?

So if I want maximum output power per channel (about 18W) by using 12V PVDD, 4Ohm speaker, I think I should use 15V peak for GAIN settings...