Description Tech Specs Alpine's Class D Amplifier Circuit CTA-2006-B Power Rating: 55W RMS x 4 (4ohm, 14.4V <= 1% THD+N) 80W RMS x 4 (2ohm, 14.4V <= 1% THD+N) Frequency Response: 10Hz - 30kHz (+/- 3dB) Damping Factor: >100