Infinity Reference amplifiers have been engineered with a compact footprint to fit in more vehicles even if available space is limited. Speaker-level and low-level inputs allow the Reference 3004A to integrate with both aftermarket and factory car stereo systems. Unlike many amplifiers available at similar prices, the Infinity Reference 3004A features variable electronic crossovers circuits allowing for precise system tuning and performance. The Reference 3004A has been engineered using Balanced Differential Inputs to ensure low noise and distortion even at high output levels. This also makes it far less susceptible to line induced radiated engine noise. On-board circuitry protects the Reference 3004A from shorts, high-temperature, overvoltage and undervoltage. An LED indicator is provided to let you know when one of these conditions exists.