вот эти цифирки ближе к делу:
RMS Continuous Power (at 14.4V 20-20kHz):
2 x 225W @ 4 Ohms (0.04% THD)
2 x 450W @ 2 Ohms (0.3% THD)
1 x 900W @ 4 Ohm Bridged (0.3% THD)