Features Compact footprint Infinity Reference amplifiers are designed with a compact chassis and small footprint to ease installation, even if available space is limited. High- and low-level inputs Speaker-level and low-level inputs allow Reference amps to work with just about any car stereo, aftermarket or factory. Variable crossovers and bass boost Unlike many amplifiers available at similar prices, Reference amps feature variable electronic crossovers and bass boost circuit to allow for fine-tuning. ADAS input with channel assignment In vehicles with ADAS warning systems, you can assign a channel to broadcast system alert messages. HALOsonic mixing input Reference amps can also work with the HALOsonic systems of select vehicles, which helps reduce external noise for a better sonic experience.