Hifonics TXi 6406 4-Channel 680-Watt A/B-Class Titan TXi Amplifier RMS @ 4-Ohms: 4 x 85-Watts RMS @ 2-Ohms: 4 x 170-Watts RMS @ 4-Ohms: 2 x 340-Watts Hifonics logo with dramatic blue illumination Matching mono-blocks & 2/3/4Ch amplifiers Sound quality Class-A/B can be combined with the matching beefy A/B-Class Titan TXi amplifier designs Bridgeable Twin Turbo Torroid EXVP MOSFET power supplies All TXi Amps incorporate High-Speed MOSFET outputs Accu-Cross™ crossover controls Low-Pass, Band-Pass/Full/Hi-Pass Adjustable Bass Equalization (+ 18dB @ 45Hz) 24dB Subsonic Filter (@ 20Hz) Soft Start Feature Prevents Turn-on Thumps Optional Remote Bass Control on 2-CH & 4-Ch Titans RCA Line-Outs for Multiple Amplifier Systems 4-Gauge Power Connectors