Can this device achieve 18W at PVDD 12V with THD 1% & load of 4 ohms?
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Given your condition, 18W is just on the boundary of voltage clipping. 12*12/2/4=18W. In this case, it's not limited by the device capability but the PVDD voltage.
To make sure you can meet the spec, I think you need to increase PVDD voltage or use lower resistance speakers.