BOSS Audio Systems OX4.400 — 4-Channel Class A/B Car Amplifier with 1600W Peak Output

Overview

Upgrade your vehicle’s sound with the BOSS Audio Systems OX4.400. This 4-channel Class A/B amplifier is designed to deliver reliable, punchy power while offering flexible wiring and sound-shaping controls. Built to drive both speakers and subwoofers, it provides a practical path to richer audio without overwhelming your dashboard.

Power and Versatility

Power is delivered in multiple configurations to match your speaker setup. You can run up to 400W per channel at 2 ohms, 200W per channel at 4 ohms, or bridge two channels for a bridged 800W total at 4 ohms. This versatility helps you scale from a simple upgrade to a more capable, multi-speaker system as your needs evolve.

• 4-channel Class A/B design for robust audio performance
• 400W per channel @ 2 Ohms; 200W per channel @ 4 Ohms; 800W bridged @ 4 Ohms

Full-Range and Bridgeable

The OX4.400 can power a full-range setup, letting you run front speakers and a sub, or you can bridge channels to boost bass output. This makes it suitable for a variety of growth paths—from everyday listening to more immersive bass experiences.

• Full-range operation supports speakers and subwoofers
• Bridgeable design to dramatically increase output when needed

Sound Shaping and Inputs

Shape the bass with a dedicated low-pass crossover and dial in the exact amount of bass you want with the Variable Bass Boost. The amp supports both low-level RCA inputs and high-level speaker inputs, making it compatible with factory radios or aftermarket head units.

• Low-pass crossover for precise bass control
• Variable bass boost to tailor low-end response
• Low and high level inputs for flexible installation options

Specs, Installation, and Warranty

Compact enough to fit under seats or in tight dash spaces, the unit measures 12.25" x 7" x 2.3". Weighing about 6.4 lbs, it’s designed for ease of integration. The BOSS warranty offers a 6-year Platinum Online Dealer coverage when purchased via Amazon, with professional installation strongly recommended to ensure safe and proper function.

Real-World Benefits

Expect more presentable midrange and a confident, controlled low end. This amplifier is well-suited for daily commutes, road trips, or weekend projects where you want a clearer soundstage and more dynamic bass without replacing your entire audio system.