Alpine KTP-445U 4-Channel 360W Compact Amp — Fits Behind Radio (Aftermarket & Factory)

Small-form 4-channel amp built for mounting behind the radio in aftermarket or factory-installed systems. Delivers up to 45W RMS (continuous) @ 4 ohms or 2 ohms per channel, with the ability to bridge channels for up to 90W continuous output. Includes a 12dB/Oct high-pass filter paired with a variable gain control for precise tuning. Designed with a 4 ohms bridged impedance to distribute power evenly and help protect the speaker from overload. Installation is simplified by RCA inputs and auto-sensing speaker-level connectors, allowing straightforward hookup to a variety of head units.