Best 4-Channel Amplifiers for Factory Head Units

Clean power and speaker-level inputs to wake up stock speakers without replacing your head unit.

Head Unit Setup & EQ (Starter)

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Top Picks

Rockford Fosgate R2‑300X4 4‑Channel Amp

Rockford Fosgate • 219.99

Clean power; class‑D efficiency; 50W x4 RMS @4Ω.

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Pioneer GM‑A6704 4‑Channel Amp

Pioneer • 149

Budget 4‑channel; flexible crossovers; bridgeable.

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Alpine KTA‑450 Power Pack 4‑Channel Amp

Alpine • 199.95

Ultra‑compact; perfect with factory radios; 45W x4 RMS.

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Kenwood Excelon X302‑4 4‑Channel Amp

Kenwood • 229

Compact chassis; 50W x4 RMS; low distortion.

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Alpine BBX-F1200 4-Channel Amplifier

Alpine

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