They accept speaker‑level inputs — from two‑channel active inputs up to four‑channel speaker inputs — and provide multiple preamp outputs. The preamp outputs include both fixed and variable options and typically include dedicated main and bass/sub outputs for driving external amplifiers.
Bundles commonly include full‑copper wiring kits with power and ground wire, twisted‑pair RCA interconnects, remote turn‑on wire, speaker wire, and a fuse holder to support a complete amplifier installation.
They offer OEM integration features such as load‑matching/load‑selection circuitry, multiple turn‑on/trigger modes for flexible installations, bass‑correction processing, and a dash‑mounted level control for remote adjustment.
