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Description

Sundown Audio SDX-400.1

Sundown Audio SDX-400.1 is a high-efficiency mono Class D amplifier designed specifically for subwoofers, delivering clean, deep, and powerful bass while keeping heat minimal. Its compact and durable chassis allows easy installation in tight spaces, and the amplifier includes adjustable low-pass and subsonic filters, full protection circuitry (thermal, over/under-voltage, short-circuit, DC-offset), and LED indicators for safe, stable operation. It is ideal for dedicated subwoofer setups or enhancing a full car audio system with strong, controlled low-end performance.


Specifications

Specifications
Product Sku
SDX-400.1
Amplifier Type
Weatherproof Mono
1 Ohm RMS Power
400 x 1 @ 1 ohm RMS
2 Ohm RMS Power
300 x 1 @ 2 ohms RMS
4 Ohm RMS Power
175 x 1 @ 4 ohms RMS
Operation Voltage
11.5 – 15V
Recommended Fuse
40A
Signal / Noise Ratio
90dB
Variable 24dB Low Pass Filters
50Hz – 250Hz
Dimensions
Length
5.75′
Width
4″
Height
2.125″

 


Feature

  • 400 x 1 @ 1 ohm RMS
  • 300 x 1 @ 2 ohms RMS
  • 175 x 1 @ 4 ohms RMS
  • Variable 12dB low-pass filter: 50Hz – 250Hz
  • Variable 12dB bass boost 
  • DC auto-sensing turn on
  • Thermal, voltage, speaker short, and dc-offset protection circuitry
  • Water resistant
  • Heavy cast aluminum heat sink
  • Removable audio control cover
  • Wired remote control 

About The Product

Get ready to experience the power and versatility with the water-resistant SDX amp! Perfect for your car, UTV, or any open-air vehicle, this compact yet mighty Class D amplifier delivers exceptional fidelity. Neatly protected beneath a sealed cover, a full suite of audio controls allow you the freedom to adjust your sound to perfection. A robust aluminum casing provides superior heat dissipation, and a shield from the elements. Whether its powersports or in your daily driver – with the SDX amp, you get great sound – for years of fun in any weather!

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Questions and Answers

Q1: What is the power output of the SDX-400.1?

A1:
• 400 W × 1 @ 2 Ω
• 250 W × 1 @ 4 Ω

Q2: What amplifier class/design does it use?
A2: The SDX-400.1 is a mono Class D amplifier, designed for efficient, high-output, low-heat performance for subwoofers.
Q3: Does it have adjustable filters for tuning?
A3: Yes, it includes a variable low-pass filter (40–250 Hz) and a subsonic filter (10–40 Hz) for precise bass tuning.
Q4: What protection features are included?
A4: The amplifier features thermal protection, over/under-voltage protection, short-circuit protection, DC-offset protection, and LED indicators for safe operation.
Q5: What are the installation and electrical specifications?
A5:
• Input Sensitivity: up to ~6 V
• Signal-to-Noise Ratio: 92 dB
• Operating Voltage: 10.5–15.5 V DC
• Compact heat-sink chassis suitable for tight installation spaces

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