Rockford Fosgate Power 400 Watt Class-ad 4-Channel Amplifier

  • $569.99

πŸ”Š Rockford Fosgate T400X4ad 400W 4-Channel Amplifier πŸ’₯

Solid Power for Speakers & Components — Clean, Reliable Sound for Full-Range Systems πŸš—πŸŽΆ
The T400X4ad is a versatile, compact 4-channel amplifier designed to give your car audio system more power with crisp, low-distortion output. Perfect for driving front and rear speakers or component systems, this amp delivers reliable performance in a wide range of installations — from factory upgrades to aftermarket speaker systems.

πŸ”₯ Key Features

  • ⚑ 400W Total RMS Output — Enough power to significantly upgrade most factory speaker systems

  • πŸ”Š 100W × 4 RMS @ 4 Ω — Balanced, clean output for all four channels

  • πŸ” Class-AD Topology — Efficient, cool running with great sound quality

  • 🎚 Independent High-Pass & Low-Pass Filters — Customize crossover points for front/rear and sub setups

  • πŸ“ˆ Variable Bass Boost — Add extra low-end when needed for punchier sound

  • πŸ”§ Multi-Way Protection Circuitry — Protects against thermal, speaker-short, over-current, and DC offset faults

  • πŸ›  Compact, Low-Profile Design — Easy fit in tight spaces such as under seats or behind panels

  • πŸ”Œ Front & Rear RCA Inputs — Flexible hookup with aftermarket head units

  • πŸ”„ Signal-Sensing Turn-On — Works with some factory head units without a remote turn-on wire

πŸ“Š Performance Specs

  • πŸ”Š 4-Channel RMS Power: 100W × 4 @ 4 Ω

  • ⚑ Total RMS Output: 400W

  • 🎚 Crossover Controls: High-pass & low-pass filters

  • πŸ“‰ Bass Boost: Yes — customizable

  • πŸ›‘ Protection: Multi-way (thermal, overcurrent, short, DC)

  • πŸ“ Compact Chassis: Easy install in tight vehicles

Great balance of power, efficiency, and tuneability for compact to mid-range systems.

🎯 Why It’s a Smart Choice

The T400X4ad brings clean, efficient power to your speakers without taking up much space — ideal if you’re upgrading a factory system or powering aftermarket front/rear speakers. Its crossover flexibility lets you tailor the sound to your components for better clarity and staging, and its cool-running Class-AD design gives reliable performance day after day.

πŸš— Perfect For

  • πŸ”Š Driving full-range front and rear speakers

  • 🎢 Component speaker systems

  • πŸ’‘ Factory radio upgrades with aftermarket amps

  • πŸ”§ Custom installs with limited space

🧠 Pro Tips

  • Set crossovers wisely:

    • For full-range systems, engage high-pass filters to protect mids and tweeters from deep bass.

    • If you add a small sub, use the low-pass filter on the sub channel to focus bass where it belongs.

  • Match power to speakers: Pair this amp with speakers that can comfortably use ~100 W RMS each — this helps avoid distortion while improving clarity and volume.

  • Use quality wiring: Good gauge power and ground wires (e.g., 4 AWG or 8 AWG depending on install) maintain stable current and prevent voltage drop.

  • Check speaker impedance: This amp is rated at 4 Ω for nominal power — ensure your speaker wiring matches for best performance.

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