rafapb
Sorry, but I think you're splitting hairs with the amps. For practical considerations, one is not any more powerful than the other. Also, with THD specs that low, the difference is meaningless. Years ago, some amps were manufactured with THD lower than these two, however there was an issue. They sounded horrible. One thing that is a negative for me about the Yamaha is that it uses an impedance switch when using 4 ohm speakers. This results in some type of limiting to prevent damage to the amp with a more difficult load. The Onkyo is built to be 4 ohm stable without the need for a switch. I would choose the Onkyo. I thinking it is likely the better sounding amp.
Sorry, but I think you're splitting hairs with the amps. For practical considerations, one is not any more powerful than the other. Also, with THD specs that low, the difference is meaningless. Years ago, some amps were manufactured with THD lower than these two, however there was an issue. They sounded horrible. One thing that is a negative for me about the Yamaha is that it uses an impedance switch when using 4 ohm speakers. This results in some type of limiting to prevent damage to the amp with a more difficult load. The Onkyo is built to be 4 ohm stable without the need for a switch. I would choose the Onkyo. I thinking it is likely the better sounding amp.