The next generation of Alpine S-Series amplifiers are designed to take your car audio experience to the next level without breaking the bank. With a sleek new redesign and upgraded features from their predecessors, these amplifiers offer exceptional performance and power on an affordable budget. The S-Series S2-A36F 4-channel amplifier delivers 60 Watts RMS @4 Ohms or 90 Watts RMS @2 Ohms of pristine high-fidelity signal to each of your car's front and rear speakers, adding sweet, clear sound to your vehicle. The amp brings your music to life being Hi-Res Audio certified, with its precise details and emotional power clearly revealed with a frequency response up to 40kHz. For a 3-channel 2-way system, you could also use the amp to drive a pair of front speakers with 60 Watts RMS each, while powering a subwoofer with 180 Watts RMS from the bridged rear channels. A variable mid-bass boost on those rear channels allows you to dial in some extra kick and impact to your system's low-frequency sound. High- and low-pass filters put you in command of the frequency spectrum that reaches your speakers and subs. The amp includes preamp- and speaker-level inputs, so you can install it in almost any vehicle, even one with a factory radio. When using the speaker-level inputs, the amp can sense the incoming signal and turn itself on, eliminating the need to run a separate turn-on wire to the receiver or fuse box. Specifications: Terminal Layout: Two-sided Included terminal covers Screw terminals (for speaker and power cables) Class-D Amplification (Digital) Hi-Res Audio Certified Channel Design: 4/3/2 Channel Side panel controls Thermal Management Control Top Mounted LED Power/Status Indicator Speaker Level Input 3 turn-on modes (DC HI, Remote HI, Remote LO) Crossover: Variable Low-pass Filter (LPF) and High-Pass Filter (HPF), Per Channel into 2 Ohms, 14.4V (≤1%THD+N): 4 x 90W Per Channel into 4 Ohms, 14.4V (≤1%THD+N): 4 x 60W Bridged, 4 Ohms, 14.4V: 2 x 180W Adjustable Gain Control Mid-Bass EQ Crossover: Variable HPF/LPF: 50-400Hz (-12dB/oct ) Mid-Bass EQ (0 to +12dB) Power Requirements: 14.4 V.DC (9 - 16 V allowable) Input Sensitivity (RCA Input): Hi: 0.5V - 10V / Low: 0.2V - 4.0V High Level Input with automatic power on Cable size: Power Cable AWG 4, SPK Cable AWG 8 Frequency Response: 10Hz – 40kHz THD+N (@ 10W into 4 Ohms): 100 Weight: 2.2kg