Belva amplifiers provide a world-class user control experience. While other amplifiers on the market only feature a fixed bass boost switch, all Belva BX-Series Monoblocks feature a variable Bass EQ. This allows the user to fine tune the bass and gain with even more precision. All BX-Series amplifiers feature both high-level and low-level inputs. High-level (speaker level) inputs accept the signal from the speakers, while low-level (RCA) inputs accept the signal from the pre-amp outputs of the source unit.