REVAMP4100 is a professional four-channel digital amplifier, incorporating high-power class D modules. The unit has sophisticated protection circuits for the speakers and the amplifier, including DC protection, over current, overheating and overload protection. entry. The unit has four independent amplification channels, but it can also be configured as two stereo channels or even as a 2.1 sound system. For this, you can use two channels as a subwoofer while the other two channels handle the other two channels.