The old, black version of RB-1090 (measured in 2020, so it must have been at least 15 years old):
https://faktiskt.io/phpBB3/viewtopic.php?f=9&t=71655
One channel is slightly worse. That's the numbers below:
1W, 8 ohm, 1 kHz, second harmonic: -99 dB
1W, 8 ohm, 1 kHz, third harmonic: -109 dB...