Alpine S2-A55V S-Series Class-D 5-Channel Amplifier, Hi-Res Certified, 40W x 4 + 200W x 1 @ 4 Ω, 60W x 4 + - The Next-Gen Alpine S-Series S2-A55V 5-Channel Amplifier is Hi-Res Audio Certified and able to reproduce up to 40kHz frequency response. This ultra-wide bandwidth coupled with the elevated S-Series design brings out a new benchmark for entry-level performance and price. 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, 83dB Frequency Response: 20Hz – 40kHz Damping Factor: >100 Alpine RUX-KNOB.2 Remote Bass Knob