Rockford Fosgate Punch P400X4 4-Channel Amplifier

The Rockford Fosgate Punch P400X4 is a four-channel amplifier built for 4‑way front‑stage/rear‑fill or 3‑way front‑stage/sub setups, delivering flexible power and onboard tone shaping for demanding car audio builds.

• Number of channels: 4‑channel configuration lets you run four speakers or bridge channels for higher output in a multi‑speaker system, enabling versatile front/rear or front/sub configurations.
• Rated power (RMS): 50 Watts x 4 @ 4Ω, 100 Watts x 4 @ 2Ω, 200 Watts x 2 @ 4Ω. Real‑world: choose 4Ω or 2Ω loads to suit your front channels or bridge two channels for subs or high‑efficiency drivers.
• Bridged Dynamic Power: 82 Watts x 4 @ 4Ω, 137 Watts x 4 @ 2Ω, 266 Watts x 2 @ 4Ω. In bridge/paired‑channel mode you get higher wattage where you need it, such as subs or demanding front channels.
• 12 dB/Octave Butterworth crossover: Provides a steep but musical roll‑off to separate bass from mids and highs, helping every speaker sit in its proper band with less interference.
• High level input with Auto Turn-On: Enables integration with factory radios and allows the amp to turn on automatically without a dedicated remote sense wire.
• PUNCH EQ on‑board: +18 dB boost at 45 Hz for bass presence and flexibility to dial in punchy low end within your cabin space.
• C.L.E.A.N. Setup: Streamlined alignment of inputs and outputs for a clean signal path and reliable performance during setup.
• Protection and construction: Short circuit protection and over‑current protection, plus a cast aluminum heatsink with convection cooling for durable operation in automotive environments.
• Stealth top‑mounted control panel & CTA‑2006 compliant: Keeps controls accessible yet discreet on installation, with compliance for standardized car audio testing guidelines.
• Remote indicators and signaling: Power/Protect/Thermal LED indicators plus input/output clip LEDs help you monitor performance at a glance.
• Inputs, outputs, and wiring: 2 RCA input pair, captive C‑Clamp speaker and power connections (8 AWG–18 AWG input/output), designed for flexible vehicle installs.
• Operating range and efficiency: Class A/B topology with ~67% average efficiency at 4Ω and a 9–16 VDC operating range, suitable for typical automotive electrical systems.
• Dimensions and weight: 2.38" H x 7.76" W x 11.03" D (6.05 x 19.71 x 28.02 cm); shipping weight 10.8 lb (4.89 kg).
• Recommended fuse: 60 A (not included).

In a real car audio build, the P400X4 suits a four‑speaker front stage with rear fill or a three‑way front stage plus subwoofer setup, offering flexible power, targeted tone shaping, and robust protection to keep your system sounding tight and reliable under typical daily driving conditions.