I am not sure I know what we are talking about here. The Onkyo 805 has less power than the 875.
875
Power Output -
Front L/R 140 W + 140 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
160 W + 160 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
170 W + 170 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Center 140 W + 140 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
160 W + 160 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
170 W + 170 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Surround L/R 140 W + 140 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
160 W + 160 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
170 W + 170 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Surround Back L/R 140 W + 140 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
160 W + 160 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
170 W + 170 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Dynamic Power
320 W (3 ohms, 1 ch)
270 W (4 ohms, 1 ch)
160 W (8 ohms, 1 ch)
and then the 805
Power Output -
Front L/R 130 W + 130 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
150 W + 150 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
160 W + 160 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Center 130 W (8 ohms, 20 Hz–20 kHz, 0.05%,
2 channels driven, FTC)
150 W (8 ohms, 1 kHz, 0.7%, 2 channels
driven, FTC)
160 W (6 ohms, 1 kHz, 0.1%, 2 channels
driven, FTC)
Surround L/R 130 W + 130 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
150 W + 150 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
160 W + 160 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Surround Back L/R 130 W + 130 W (8 ohms, 20 Hz–20 kHz,
0.05%, 2 channels driven, FTC)
150 W + 150 W (8 ohms, 1 kHz, 0.7%,
2 channels driven, FTC)
160 W + 160 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Dynamic Power
300 W (3 ohms, 1 ch)
250 W (4 ohms, 1 ch)
150 W (8 ohms, 1 ch)