Soundstream PN4-520D | Compact 4-Channel Class D Amplifier with MOSFET Power and Auto Signal Sensing

Precision Sound Power in a Space-Saving Design

At first glance, the Soundstream PN4-520D Picasso Nano Amplifier seems too small to deliver real power—but size doesn’t dictate performance here. Despite its ultra-compact chassis, this amplifier delivers up to 520 watts of RMS power, optimized across 4, 3, or 2 channels depending on your configuration needs.

Built for cars, motorcycles, and tight installations, it mounts cleanly under seats or inside fairings—staying hidden while your sound system makes a strong impression.

Designed for Tight Spaces—Built for Clean Output

Whether it’s the front or back seat, the PN4-520D slides into place with minimal clearance, leaving room for ventilation. Even after extended high-volume playback, this amp stays cool and stable, eliminating common heat issues seen in other compact class D models.

Thanks to integrated high-pass and low-pass crossovers at 80 Hz and a subsonic filter ranging from 10–50 Hz, your music stays tight, distortion-free, and full of clarity—regardless of source.

Core Features & Signal Handling

This amplifier is engineered with real-world usability in mind. It uses a true MOSFET PWM power supply, avoiding the pseudo-tech found in lower-end models. Combined with Class D circuitry, it ensures efficient output without compromising fidelity.

And when using a factory or stock radio, the PN4-520D doesn’t require a remote wire. Its Automatic Hi-Level Signal Sensing Turn-On detects speaker-level signals and activates the amp instantly—making installation simpler and more intuitive.

Output Versatility and Performance

Whether you’re running full-range speakers or a bridged subwoofer setup, this amp adapts to your build. It offers:

• 100 W RMS x 4 @ 4Ω
• 130 W RMS x 4 @ 2Ω
• 260 W RMS x 2 bridged @ 4Ω

This allows clean power for component speakers, coaxials, or compact subs—all from a single chassis.

Seamless Integration for Factory or Aftermarket Systems

Integration is smooth with both high-level (speaker) and low-level (RCA) inputs, while input sensitivity ranges from 200 mV to 6 V, making it compatible with virtually any head unit.

And for those who want on-the-go control, the PN4-520D includes a dash-mounted remote gain control—giving you real-time adjustments without diving into your deck.

Key Takeaways

• Ultra-compact 4-channel Class D amplifier
• 520 watts total RMS power
• MOSFET PWM power supply & thermal-safe design
• High-level sensing with automatic turn-on
• 80 Hz 12 dB/oct HP/LP crossover + subsonic filter
• Bridgeable channels for subwoofer use
• Perfect for under-seat or motorcycle fairing installs