In the datasheet, it said TPD3118D2 can support 2x 30W@8ohm, 24V. How about 2x15W (stereo) and 1x 30W (woofer) @4ohm, 12V?
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It's not so related to efficiency because we can increase the current when efficiency is low.
The Rdson of MOSFET and inductor will divide voltage from load. We usually assume a -0.5dB voltage will lost on these devices. So with 12V PVDD, the max voltage on load is around 11.3V. The output on load is always sine wave, you need to use the RMS value to calculate power. It's 11.3^2 / 2 / 4 = 15.96W.