Sound Magus HD1200.4

Compact Premium Class D Car Audio Amplifier — Technical White Paper

1. Abstract

The HD1200.4 is a high-efficiency Class D amplifier engineered to deliver audiophile-grade performance in a compact chassis. With advanced switching topology, ultra-low distortion, and robust protection systems, it is optimized for modern automotive installations where space, power density, and reliability are critical.

2. Introduction

Automotive sound systems demand amplifiers that combine thermal efficiency, compactness, and high fidelity. The HD1200.4 fulfills these requirements with:

• Class D architecture for high efficiency and low heat dissipation.

• Continuous high-power output for demanding loads.

• Space-optimized design for flexible integration.

3. Electrical & Acoustic Performance

• Amplifier Topology: Class D switching design.

• Rated Power Output (RMS, ≤1% THD+N):

  • 200 W × 4 @ 4 Ω

  • 300 W × 4 @ 2 Ω

  • 600 W × 2 @ 4 Ω bridged

• Frequency Response: 15 Hz – 25 kHz (–3 dB).

• Signal-to-Noise Ratio:

  • 98 dB (A-weighted) @ rated power

  • 78 dB (A-weighted) @ 1 W (CEA-2006)

• THD+N: <0.02% @ 70 W, 4 Ω, 1 kHz.

4. System Integration

• Input Sensitivity: 0.2–5 V (compatible with OEM & aftermarket sources).

• Auto Turn-On: Remote (REM).

• Crossover & Filtering:

  • Switchable Full / HPF / LPF (12 dB/octave).

  • HPF (Group A): OFF – 300 Hz.

  • LPF/HPF (Group B): 50 – 300 Hz.

5. Protection & Reliability

Multi-layered safety circuits:

• Overload protection.

• Short-circuit protection.

• Thermal shutdown.

• Under-voltage & over-voltage safeguards.

Ensures stable long-term performance in demanding automotive environments.

6. Mechanical Design

• Dimensions: 46 mm (H) × 128 mm (W) × 254.5 mm (L).

• Chassis: Slim, space-efficient housing for concealed or flexible installation.

• Power Wiring: Supports 2–4 AWG cabling.

• External Fuse Recommendation: 150 A.

7. Conclusion

The HD1200.4 strikes an ideal balance between compact installation, high-output capability, and audiophile clarity. Leveraging advanced Class D topology and robust protective architecture, it provides an efficient, uncompromising solution for premium aftermarket and OEM car audio systems.

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