THDN vs dBu (input) into 30-ohms and 330-ohms. To arrive at output dBu, add +13.22 gain. We get to around -4dBu input before we hit the knee were clipping starts to occur. That would be 9.22 dBu at the output, which is about 2.2Vrms. I'll let you guys to the power numbers yourselves. Everyone on SBAF should be able to do this. Note that the typical use range between -25dBu to -15dBu at the input (about -12 to -2 dBu at the output) is in the ideal sweet spot of the amp in terms of THD+N which is a just a bit better than 60db. While I would have liked to see more margin against 60db some SINAD, the measurements shouldn't really present an issue, unless one listens to bassy headphones or bassy material.