Class D amplifier's gain.

[Els_Chaos]

Hi everyone,
I'm doing a small assignment about class D amplifier, but I'm confused while calculating the gain of its. As my teacher said that the gain of class D only depends on the rail voltage, which is ± 150V in this case and the amplitude of the triangle Vtr  should be larger than Vaudio_amp_peak about 80%. So with Vaudio_peak is about 46,5V (at t=), Vtr should be 80,5V. But when doing FFT (with the setting -    Number of data points samples in time: 16777216 and Windowing Function: Flat-top), i know that Vtr also affect the gain of the amplifier.

[mtwieg]

Voltage gain will basically be the supply voltage of the bridge output divided by the amplitude of ramp waveform used for your PWM modulator.

[SteveThackery]

Is there no feedback loop from the analogue output on class D amps? I ask because that is what sets the voltage gain on an "ordinary" analogue amp.