Rockford Fosgate Power 400 Watt 4-Channel Amplifier

  • $439.99

πŸ”Š Rockford Fosgate T400-4 400W 4-Channel Amplifier πŸ’₯

Compact Power for Full-Range Systems — Upgrade Speakers with Clean, Efficient Amplification πŸš—πŸŽΆ
The T400-4 is a compact 4-channel Class-AB amplifier engineered to deliver reliable, distortion-controlled power to your speakers. Perfect for full-range speaker upgrades in cars or trucks, this amp boosts volume and clarity without taking up much space — ideal for under-seat or behind-panel installs.

πŸš€ Key Features

  • ⚑ 400W Total RMS Output — Enough power to significantly enhance factory speakers

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

  • πŸŒ€ Class-AB Design — Smooth, natural sound with excellent midrange performance

  • 🎚 Independent High-Pass & Low-Pass Filters — Tune crossovers to match your system

  • πŸ“ˆ Variable Bass Boost — Add emphasis to low-end frequencies when needed

  • πŸ›‘ Multi-Way Protection Circuitry — Safeguards against thermal overload, speaker shorts, over-current, and DC offset

  • 🧠 Signal-Sensing Turn-On — Works with many factory head units that don’t have remote turn-on wires

  • πŸ›  Compact Chassis — Easy installation in tight spaces like under seats

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

πŸ“Š Performance Specs

  • πŸ”Š Total RMS Output: 400W

  • ⚑ RMS Power per Channel: 100W × 4 @ 4Ω

  • 🎚 Crossover Controls: Independent high-pass & low-pass

  • πŸ“‰ Bass Boost: Adjustable

  • πŸ›‘ Protection: Multi-way (over-temp, speaker short, over-current, DC offset)

  • πŸ“ Chassis: Compact design for versatile mounting

🎯 Why It’s a Smart Choice

The T400-4 is ideal for bringing extra power and detail to your car’s speaker system without needing a large or complex amplifier setup. Its Class-AB circuitry delivers natural sound reproduction, and the built-in crossover and bass controls make tuning simple for everyday listening or enhanced aftermarket systems.

πŸš— Perfect For

  • πŸ”Š Upgrading full-range factory speakers

  • 🎢 Component speaker systems

  • πŸ’‘ Compact installs under seats or behind panels

  • πŸ”§ Factory radio upgrades needing extra power

🧠 Pro Tips

  • Use high-pass filters on smaller speakers to protect them from low bass that they can’t reproduce — this results in clearer mid and high frequencies.

  • Adjust bass boost sparingly (2–4 dB) to add depth without distortion, especially in tighter cabins.

  • Match power to your speakers: Amplifiers that deliver around 100W RMS per channel are a great upgrade over most factory systems and help reduce distortion at higher volumes.

  • Run quality wiring and fuses: Good gauge power/ground wiring and proper fusing improve electrical reliability and amplifier performance.

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