SLAA898 September 2022 TAS3251 , TPA3255
From the test result for the previously discussed experiment, the THD+N stays below 0.1% at most frequencies, which is slightly higher than when using the TPA3255 device to directly drive a 4-Ω load. This is due to the distortion of the two transformers. The efficiency is very low in this configuration. Even when driving large power (100 W in total across all the resistors), the efficiency is only a little more than 50%.