Skar Audio SA-50.4D 400W 4-Channel Class D Car Amplifier

Overview

The Skar Audio SA-50.4D is a compact four-channel amplifier designed for car audio upgrades. Built with a Class D topology, it aims to deliver clean, energetic power to multiple speakers while keeping thermal performance efficient. Its slim footprint makes it suitable for tight dashboards and crowded engine bays, without sacrificing flexibility.

What it delivers

With four channels, this amp supports a traditional front/rear speaker setup, or you can bridge a pair for a dedicated sub while still powering the remaining channels. The dual-channel group tuning and multiple crossover options let you tailor the sound to your vehicle’s acoustics, creating a balanced and engaging listening experience without overhauling your entire system.

Key specs

• 400-Watt four-channel Class D amplifier
• RMS power at 2 Ω: 100W × 4 channels
• RMS power at 4 Ω: 60W × 4 channels
• RMS power at 4 Ω (bridged): 110W × 2 channels
• Operating voltage: 8.5V–16V
• Crossover options: HPF, Full-Range, LPF
• Power/Ground input size: 4 AWG
• Frequency response: 10 Hz – 25 kHz

Flexible tuning and controls

• Gain and crossover frequencies are adjustable for channels 1&2 and 3&4
• Separate tuning for each channel pair supports customized front/rear or sub configurations
• HPF, LPF, and Full-Range modes let you shape bass, mids, and highs to your vehicle’s acoustics

Real-world use cases

Imagine upgrading to a clarifying front-stage with component speakers while keeping reliable rear fill. Bridging two channels can provide a dedicated sub solution in compact spaces, preserving cabin headroom and reducing wiring complexity. Overall, the SA-50.4D offers a versatile path toward clearer, more dynamic car audio—without making guarantees about specific outcomes—dependent on the rest of your system.

Installation tips

Run a four-gauge power and ground harness as recommended and keep wiring neat to minimize noise. Ensure your vehicle’s electrical system can support peak demands and use solid connectors for a secure, lasting setup.