MRV-M500 - Alpine Monoblock 500W RMS V Power Series Car Amplifier MRV-M500 - Alpine Monoblock 500W RMS Amplifier Evolution to Class D digital platform New snap-on terminal covers for easy installation Current Protection: Over-Current, Over-Voltage, Under-Voltage and Thermal Protection Dimensions (WxHxD) in: 7-7/8'' x 2-3/16'' x 7-7/8''