Alpine S2-A55V S-Series Class-D 5-Channel Amplifier, Hi-Res Certified, 40W x 4 + 200W x 1 @ 4 Ω, 60W x 4 + 300W x 1 @ 2 Ω - Entry-level sound just got elevated with the S2-A36F 4-Channel Amplifier. Its sleek redesign houses an Alpine Class D Amplifier Circuit and is now certified for Hi-Res Audio Playback. MAIN FEATURES • Hi-Res Audio Certified (Up to 40kHz) • 5-Channel Amplifier • Alpine’s Class D Amplifier Circuit • Two-sided terminal layout • Built-in Selectable/ Adjustable Crossovers • Optional Remote Bass Knob Compatible (required RUX-KNOB.2 or RUX-H01, sold separately) TECH SPECS • Power Rating: 14.4V, < 0.1% THD +N • Power Output: 40W x 4 + 200W x 1 @ 4Ω, 60W x 4 + 300W x 1 @ 2Ω • Bridged Power: 120W RMS x 2 @ 4Ω • S/N Ratio: >83dB • Frequency Response: 20Hz – 40kHz • Damping Factor: >100 Alpine RUX-H01 Remote Bass Knob for the Alpine Halo Display