The RX4S Toro Audio Multi Channel Amplifier is a high-end sound quality car amplifier rated at 80 Watts x 4 @ 4 Ohms RMS. Stable at 2 Ohms with a high quality A/B Class PCB layout that includes built-in auto-sensing turn on function for vehicles that do not have the ability for RCA output, selective Bass Boost EQ for fine tuning, soft delay remote turn on/off the circuit that eliminates pops and clicks. The RX4S utilizes a MOSFET power supply for high output and increased stability, variable gain control, double layer PCB, high-quality surface mount device components and Tiffany Style Nickle plated RCA inputs for an excellent performance to value ratio! With a frequency range from 14Hz ~ 50kHz this versatile amp can power a wide range of subwoofers and speakers. FEATURES: Sound Quality Class-A/B Design Double Sided PCB High Quality SMD Components Tiffany Style Nickle Plated RCA Inputs Built-In Auto Sensing Turn-On Function (Hi-Inputs) MOSFET Power Supplies for High Power Output and Best Stability into Low Impedance Loads Soft Delay Remote Turn On/Off Circuit Eliminates Pops and Clicks Variable Low Pass & High Pass Electronic Crossover Selectable Bass Boost EQ ~ OFF / 6dB / 12dB Self-Diagnostic Protection Circuit with LED Status Indicator for Impedance Over-load, Speaker Short Circuit, Thermal Overheating, and DC Output Variable Gain Control SPECIFICATIONS: RMS @ 4 Ohms 80w x 4 RMS @ 2 Ohms 100w x 4 Bridged RMS @ 4 Ohms 200w x 2 Min Impedance 2 Ohm LPF / HPF 80Hz ~ 3kHz / Full ~ 3kHz THD @ RMS Power 105 dB Max Voltage 14.5v RCA Voltage 200mV ~ 10V Freq. Response 14Hz - 50kHz Crossover Slope 12dB Rear Channel Subsonic Filter N/A Bass EQ OFF / 6dB / 12dB Subwoofer EQ N/A Dimensions Inches 12.56 (in) x 2.0 (in) x 7.1 (in) Dimensions mm 319mm x 54mm x 171mm