Measurement of burst power, 20kHz sine burst, A250W4R class AB amplifier, load 4ohm//2.2uF
, 2.68 ohm modulus at 20kHz and phase angle -48°. Power = 297W/4ohm, but 443W/2.68ohm.
The burst is digitally generated by Topping D10s at Fs=96kHz, thus the ringing at the beginning and at the end of the burst. Please also note the sharp cut of spectrum above DAC Fs/2 (48kHz).