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Description

Sundown Audio SIA-1250D

Sundown Audio SIA-1750D is a high-power mono Class D amplifier designed for subwoofer applications, delivering deep, clean, and controlled bass with excellent efficiency. Its compact, durable chassis allows for easy installation in tight spaces while the Class D design ensures minimal heat generation even under high output. The amplifier features adjustable low-pass and subsonic filters for precise tuning, comprehensive protection circuitry (thermal, over/under-voltage, short-circuit, DC-offset), and LED indicators for monitoring and safe operation, making it ideal for dedicated subwoofer setups or enhancing full-system car audio with powerful low-end performance.


Specifications

Specifications
Product Sku
SIA-1750D
1 Ohm RMS Power
1,750 x 1 @ 1 ohm RMS
2 Ohm RMS Power
1,750 x 1 @ 2 ohms RMS
4 Ohm RMS Power
1,250 x 1 @ 4 ohms RMS
Operation Voltage
10.5V – 15.5V DC
Recommended Fuse
220A
Signal / Noise Ratio
108dB
Variable 12dB High Pass Filters
10Hz-1kHz
Variable 12dB Low Pass Filters
40Hz-20kHz
Dimensions
Length
7.25″
Width
7.25″
Height
2.45″

 

 


Features

  • 1,750 x 1 @ 1 ohm RMS
  • 1,750 x 1 @ 2 ohms RMS
  • 1,250 x 1 @ 4 ohms RMS
  • Variable 12dB low pass filter: 40Hz-20kHz
  • Variable 12dB high pass filter: 10Hz-1kHz
  • Variable 12dB Bass Boost @ 50Hz
  • Power, protection & clipping indicators included
  • Thermal, voltage, speaker short, and dc-offset protection circuitry
  • Advanced 3-speed fan design
  • Subsonic filter
  • Intelligent full bridge design
  • Wired remote control with clipping indicator included

About The Product

Delivering the same power at 1 or 2 ohms, Sundown SIA Smart amplifiers are built with power and stability at their core. These full-bridge amplifiers feature a heavy heatsink for outstanding thermal management, while the three-speed Smart Cooling fan and advanced power supply design protects the amplifier from overheating and distorted output.

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Questions and Answers

Q1: What is the power output of the SIA-1750D?
A1:
• 1750 W × 1 @ 2 Ω
• 1100 W × 1 @ 4 Ω
Q2: What amplifier class/design does it use?
A2: The SIA-1750D is a mono Class D amplifier, offering high efficiency, strong bass output, and low heat generation.
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) to optimize subwoofer performance.
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, durable heat-sink chassis for tight installations

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