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Description

Sundown Audio SFB-500.4

Sundown Audio SFB-500.4 is a compact 4-channel full-range Class D amplifier designed for clean sound, high efficiency, and reliable daily performance. It delivers strong power for door speakers, components, and coaxials while maintaining low heat through its efficient Class D design. The amp supports multi-speaker builds, active setups, and factory system upgrades, and includes variable HPF/LPF filters, high-quality internal components, and full protection circuitry (thermal, overload, voltage, and short-circuit) along with status LEDs for easy tuning and system monitoring.


Specifications

Specifications
Product Sku
SFB-500.4
Amplifier Type
4-channel full-range amplifier
1 Ohm RMS Power
500 x 4 @ 1 ohm RMS
2 Ohm RMS Power
300 x 4 @ 2 ohms RMS
4 Ohm RMS Power
200 x 4 @ 4 ohms RMS
Operation Voltage
10.5v-15.5v
Recommended Fuse
180A
Signal / Noise Ratio
100dB
Variable 12dB High Pass Filters
15Hz – 6kHz
Variable 12dB Low Pass Filters
50Hz – 6kHz
Dimensions
Length
9.75″
Width
2.75″
Height
8.28″


Features

  • 500 x 4 @ 1 ohm RMS
  • 300 x 4 @ 2 ohms RMS
  • 200 x 4 @ 4 ohms RMS
  • 4-channel full-range amplifier
  • Variable 12dB low pass filter: 50Hz – 6kHz
  • Variable 12dB high pass filter: 15Hz – 6kHz
  • Variable 12dB Bass Boost @ 50Hz
  • Power, protection & clipping indicators included
  • Thermal, voltage, speaker short, and dc-offset protection circuitry
  • Optional wired remote control with clipping indicator

About The Product

Introducing the Sundown Full Bridge line of amplifiers! The “Brazilian Style” SFB packs a powerful punch in a compact size, stable down to 1 ohm per channel.  Use the SFB to wire several speakers together on every channel – an ideal amp for a PA mid/high speaker array, a large marine system, or your favorite set of separates. If you are looking for raw power on a budget –  look no further!

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Questions and Answers

Q1: What is the power output of the SFB-500.4?
A1:
• 80 W × 4 @ 4 Ω
• 125 W × 4 @ 2 Ω
• 250 W × 2 (bridged) @ 4 Ω
Q2: What amplifier class/design does it use?
A2: The SFB-500.4 is a full-range Class D amplifier offering high efficiency, strong output, and low thermal build-up in a compact housing.
Q3: Does it offer adjustable filters for tuning?
A3: Yes, each channel pair includes variable high-pass and low-pass filters, allowing flexible tuning for components, coaxials, or midrange speakers.
Q4: What protection features are included?
A4: It includes multiple protection circuits such as thermal protection, overload/short-circuit protection, over-voltage/under-voltage protection, and a protect-mode LED indicator.
Q5: What are the installation and electrical specifications?
A5:
• Input Sensitivity: ~6 V max
• Signal-to-Noise Ratio: 90 dB
• Operating Voltage: 9 V – 15 V DC
• Compact chassis for easy mounting in tight spaces

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