MTX 500W Mono Road Thunder Amplifier Features: Class D topology provides greater efficiency than A/B models for extended play. Dual Sides Fiberglass PCB contains twice as much copper as single sided PCB providing twice the current capacity. 24dB/Oct LPF slope prevents frequencies outside the crossover point for improved sonic accuracy. Balanced RCA input offers better noise rejection and prevents introduction of ground loops through the RCA connection. External Bass Control included for greater sound customization. Type: Amplifiers Amplifier Class: Class D RMS Power: 250W x 1 @ 4 ohms 500W x 1 @ 2 ohms Frequency Response: 20Hz - 200Hz THD: SNR: 75 dB Input Voltage: 250mV - 4V