Three new RA series amps – RA150, RA300 and RA500 – providing a bold and powerful answer to the question, "What’s next from Alesis?" Combined with our popular RA100, they offer a wide range of high-quality, popularly priced solutions for virtually any – and every – situation. Height: 2 RU - Rated output per channel : 4 ohms : 150 watts RMS per channel - 8 ohms : 90 watts RMS per channel - 8 ohms : 300 watts RMS bridged mode - Signal to Noise Ratio : >105dB - Frequency Response : 10Hz - 70kHz +0, -3dB - Distortion : < 0.02% @ 4ohms, 20Hz - 20kHz - Input Sensitivity : +4dB for rated output - Crosstalk : 85dB, 1kHz - Output offset : +/- 50 mV, Servo controlled.