Diamond Audio MICRO81U 1-Channel MICRO8U Series Monoblock Class D Digital Car Amplifier

Diamond Audio MICRO81U

The Diamond Audio MICRO8U 1-Channel Monoblock Class D Amplifier, designed for enthusiasts who demand compact size, high output, and all-weather durability. As part of the advanced Diamond Audio MICRO8U amplifier series, this monoblock car audio amplifier delivers exceptional performance for subwoofers in car, marine, motorcycle, and powersports audio systems.

Engineered from the ground up, the Diamond Audio MICRO8U monoblock amplifier features a full-range Class D design, providing clean, efficient power while minimizing heat and maximizing performance. With 300W RMS at 2 ohms and 175W RMS at 4 ohms, this 1-channel amplifier is ideal for driving subwoofers with tight, controlled bass and consistent output, even in demanding environments.

Built for versatility, the MICRO8U Class D amplifier is conformal-coated for all-weather applications, making it perfect for marine audio systems, motorcycles, ATVs, UTVs, and outdoor installations. The protective coating helps guard against moisture, dust, and environmental exposure, ensuring long-lasting reliability wherever your system is installed.

The compact amplifier design allows for easy installation in tight spaces, while the uniform MICRO8U platform ensures a clean and streamlined look across your entire audio setup. With selectable REM, VOX, and DC turn-on modes, along with flexible input configurations, this monoblock amplifier integrates seamlessly into both factory and aftermarket systems.

Advanced tuning features include a 40–400Hz crossover filter, wide frequency response (10Hz–350Hz), and adjustable input sensitivity (0.2–10V), allowing precise control over your subwoofer performance.

Features

• 1-Channel Monoblock Class D Amplifier
• 300W x 1 @ 2Ω / 175W x 1 @ 4Ω RMS
• Compact, Space-Saving Design
• Conformal-Coated for All-Weather Durability
• Selectable REM / VOX / DC Turn-on Modes
• Adjustable Crossover and Input Sensitivity
• Includes RCA Input & Speaker Output Harness Kits
• Full Range Class D IR Chipset
• DirectFET Power MOSFET Output Stage
• SMD Technology on 4 layer Glass PC Board
• ICAD Circuit Provides Superior Overload Protection
• Frequency Response : 10 Hz – 350Hz
• Variable 12dB Crossovers
• Micro Bass Boost +12dB @45HZ
• Premium 8 Gauge Power Connections
• Ideal for Subwoofer and Bass Applications
• Includes Remote Bass Knob

Specifications

MICRO8U Series 1-Channel Monoblock Class D Car Amplifier

Power Rating

• MAX Power : 500 Watt
• RMS Power (2Ω) : 300 Watt x 1 Channel
• RMS Power (4Ω) : 175 Watt x 1 Channel
• Bridged (Mono 2Ω) : 300 Watt x 1 Channel
• Bridged (Mono 4Ω) : 175 Watt x 1 Channel

Power Supply

• Power Supply : Full PWM
• Power Supply Threshold : 10.0VDC - 17.0VDC
• Idle Current : 0.7A

Distortion

• THD 4 (1KHz @ 4Ω) : 0.5%
• S/N Ratio (A Weighted @1W) : -85dBA
• S/N Ratio (A Weighted @ FP) : -101.1dBA

Input Sensitivity

• Low Input Level : 200mV - 10V
• High Input Level : N/A

Input Impedance

• Low Input Level : 20KΩ
• AUX Input Level : 20KΩ

Output Stage

• Output Impedance : 0.011 Ω
• Damping Factor (50Hz @ 4Ω) : >250
• Bandwidth (-3dB) : 10Hz-350Hz

Crossover (-12dB/Oct)

• Variable High-Pass : 40Hz - 400Hz
• Variable Low-Pass : 40Hz - 400Hz
• Variable Sub-Sonic : 10Hz - 55Hz

Fuse Ratings

• ATC : 25A

Dimensions

• L x W x H : 9.0" x 4.06" x 1.52" (228.6 x 103.124 x 38.608)mm