Soundstream ST4.500D Stealth Series 500-Watt 4-Channel Micro Class-D Car and Powersports Amplifier
The Soundstream ST4.500D Stealth Series amplifier is engineered to deliver incredible output and musical fidelity from an ultra-compact chassis designed to fit where traditional amplifiers cannot. Ideal for space-constrained installations in modern vehicles, motorcycles, UTVs, and marine applications, this 4-channel micro Class-D powerhouse outputs a solid 125 Watts x 4 channels at 2 Ohms or 80 Watts x 4 channels at 4 Ohms. With a chassis footprint measuring less than 8 inches long and 3 inches wide, it provides an unyielding, beefy foundation for full-range car audio setups without sacrificing valuable cargo or storage space.
Built around an advanced surface-mount technology (SMT) circuit design, the ST4.500D offers exceptional power density, low heat generation, and minimal current draw from your vehicle's electrical system. For complete installation flexibility, it features both high-level speaker inputs with auto-turn-on integration for factory OEM radios and low-level RCA inputs for aftermarket head units. Equipped with independent high-pass and low-pass crossover controls, variable gain adjustment, and direct-harness connections, this Stealth Series amplifier makes upgrading your vehicle's sound system fast, clean, and efficient.
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Key Features:
- Ultra-Compact Micro Footprint: Extremely small chassis dimensions allow seamless installation under seats, inside motorcycle fairings, or behind dash panels.
- High-Efficiency Class-D Topology: Advanced Class-D digital circuitry generates maximum output power with minimal thermal output and low battery current draw.
- Surface-Mount Technology (SMT): Utilizes precision-assembled SMT components to resist heavy vehicle vibration and maintain long-term circuit stability.
- Versatile 4-Channel Power: Delivers 125W RMS x 4 at 2 Ohms, 45W RMS x 4 at 4 Ohms, or 250W RMS x 2 bridged at 4 Ohms for flexible speaker configuration.
- High and Low-Level Inputs: Natively accepts RCA signals from aftermarket receivers or high-level speaker signals directly from factory OEM head units.
- Automatic Signal Sensing: High-level input mode detects incoming audio signals to automatically power on the amplifier without requiring a remote lead wire.
- Independent Active Crossovers: Features switchable high-pass and low-pass crossover networks on front and rear channels for precise speaker frequency management.
- Durable Extruded Aluminum Heat Sink: Heavy-duty aluminum alloy chassis effectively dissipates thermal energy during extended high-volume listening sessions.
Specifications:
- Power Ratings & Output Benchmarks:
- RMS Power Output @ 4 Ohms: 80 Watts x 4 Channels
- RMS Power Output @ 2 Ohms: 125 Watts x 4 Channels
- RMS Power Output @ 4 Ohms Bridged: 250 Watts x 2 Channels
- Total Maximum Dynamic Power: 500 Watts
- Amplifier Circuit Topology: Micro Class-D Digital (SMT Construction)
- Acoustic & Signal Processing Controls:
- Frequency Response: 10Hz – 20kHz
- Signal-to-Noise Ratio: >90dB
- Total Harmonic Distortion (THD): <0.5%
- High-Pass Crossover Filter: Variable 80Hz (12dB/Octave)
- Low-Pass Crossover Filter: Variable 80Hz (12dB/Octave)
- Input Sensitivity Range: 200mV – 6V
- Connectivity & Electrical Architecture:
- Low-Level Input Interface: Stereo RCA Harness Inputs
- High-Level Input Interface: Molex High-Level Speaker Wire Harness Included
- Turn-On Mechanism: DC Offset / Signal-Sensing Auto Turn-On or Remote Wire
- Power / Ground Wire Gauge Compatibility: 8-AWG Direct Connections
- Recommended Inline Protection: 30A Fuse
- Physical Profiles & Installation Dimensions:
- Chassis Length: 7.75" (19.7 cm)
- Chassis Width: 3.00" (7.6 cm)
- Chassis Height: 1.50" (3.8 cm)
- Finish: Anodized Matte Black Extruded Aluminum
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