znalazłem taki opis:
BM AMPLIFIER PCH-990ATX 1800W 2CH.RMS 2x300W / 4ohm, 2x600W / 2ohm, 1x1200W / 4ohm. Stable stereo 2 Ohm. Low hysteresis and high common mode, which provides a super simple field effect. There overload protection and thermal protection. 4 Ohms Max Power output: 900Wx2Ch @ 0.035% THD - 4 Ohms Bridged Max Out: 1800Wx1Ch @ 0.035% THD - 4 Ohms RMS Out: 450W x 2 Channel @ 0.035% THD - Low 200mv ~ 2V Adjustable Level