PRV Audio QS400.4 4-Channel Car Amplifier — 2 Ohm Stable, 4 x 100W RMS, Compact 12V Class D

Compact power with big potential for your car audio

The PRV Audio QS400.4 is a compact four‑channel amplifier that delivers true four‑channel performance without stacking bulk in your vehicle. It provides up to 4 x 100 watts RMS when wired at 2 ohms, while operating from a standard 12‑volt electrical system. This combination can help you elevate the clarity and punch across front and rear speakers, all in a small, easy‑to‑hide package.

Efficient, high‑pedigree design

Built with digital Class D technology and Brazilian engineering, the QS400.4 emphasizes efficiency and thermal management. The result is more usable power with less heat generation, which can translate into steadier performance during longer drives or high‑demand listening sessions.

• 4 x 100 watts RMS at 2 ohms: plenty of headroom for multiple speakers.
• 2‑channel bridging: pair two channels for an extra 200 watts RMS to a single speaker or subwoofer channel.
• Full‑range output: designed to cover a broad frequency spectrum for a cohesive soundstage.
• 12‑volt compatibility: designed to work with typical car electrical systems.
• Compact footprint: 4 inches wide, 5.4 inches long, and 2 inches tall, enabling flexible mounting options.

What this means in real‑world use

With a small footprint, the QS400.4 can be tucked under a seat, in the dash pocket, or in the trunk area—where space is at a premium. The 2‑ohm stability supports wiring arrangements that distribute power across several speakers, helping your system feel more balanced rather than overdriven. Bridging two channels can open up higher output for a pair of speakers, adding dynamic emphasis where you want it most.

• Supports multiple speaker configurations without a bulky amplifier.
• Bridge mode offers a path to stronger output for paired speakers.
• Designed to respect your vehicle’s electrical system while delivering audible improvements.

Whether you’re upgrading a factory setup or building a new system from the ground up, the QS400.4 presents a practical option that prioritizes efficiency, installation ease, and flexible power delivery. Explore the possibilities for your vehicle’s sound stage without committing to a larger component or a complicated install.