Diamond Audio DMD250.1D 1-Channel DMD Series Monoblock Class D Digital Car Amplifier

Diamond Audio DMD250.1D

The Diamond Audio DMD250.1D Monoblock Class D Digital Amplifier, engineered for car audio enthusiasts seeking powerful bass in a compact, budget-friendly amplifier. As part of the trusted DMD Series amplifiers, the DMD250.1D delivers clean, reliable low-frequency performance for daily drivers and entry-level builds.

Built with advanced Class D amplifier technology, the Diamond Audio DMD250.1D amplifier produces 250W RMS at 2 ohms and 160W RMS at 4 ohms, delivering tight, controlled, and distortion-free bass for your subwoofer system. Its high-efficiency design minimizes heat while maximizing output, ensuring consistent performance even during extended listening sessions.

Designed with 4-layer FR4 circuit boards and advanced SMD technology, the DMD250.1D monoblock amplifier offers durability and stable power delivery in a compact chassis. Balanced differential inputs provide clean, noise-free signal transmission, making this amplifier ideal for both factory and aftermarket audio systems.

Fine-tune your bass with variable low-pass crossover control (35Hz–350Hz), adjustable phase control, and up to 18dB bass boost, allowing you to dial in the perfect subwoofer response. The included remote bass knob gives you on-the-fly control of your bass output, putting full command of your system at your fingertips.

Installation is simple with selectable REM, VOX, and DC turn-on modes, ensuring seamless integration with OEM and aftermarket head units. The LED power/protection indicator provides system status at a glance, while built-in short circuit, thermal, and voltage protection safeguards your investment.

Features

• 1-Channel Monoblock Class D Digital Amplifier
• 250W RMS @ 2Ω / 160W RMS @ 4Ω
• Compact, High-Efficiency Digital Amplifier Design
• DirectFET Power MOSFET Output Stage
• 4-Layer PCB with Advanced SMD Circuitry
• Variable LPF, Phase Control, and Bass Boost (0 – 18dB)
• Balanced Differential Inputs for Clean Signal
• Selectable REM / VOX / DC Turn-on Modes
• Input Sensitivity : 0.2-10 Volt
• Crossover Filter : 50 - 250Hz (LPF), 24dB Per Octave Slope
• Frequency Response : 20 - 500Hz
• Signal to Noise Ratio : >90dB
• Includes Remote Bass Knob and LED Status Indicator

Specifications

1-Channel DMD Series Monoblock Class-D Digital Amplifier

Power Rating

• RMS Power (2Ω) : 250 Watt x 1 Channel
• RMS Power (4Ω) : 160 Watt x 1 Channel

Power Supply

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

Distortion

• THD (1KHz @ 4Ω) : 0.07%
• S/N Ratio (A Weighted @ 1W) : -77.4dBA
• S/N Ratio (A Weighted @ FP) : -97.4dBA

Input Sensitivity

• Low Input Level : 200mV - 10V
• High Input Level : Up to 25W RMS

Input Impedance

• Low Input Level : 22KΩ
• High Input Level : 22KΩ

Output Stage

• Output Impedance : 0.047Ω
• Damping Factor (50Hz @ 4Ω) : >250
• Bandwidth (-3dB) : 10Hz-350Hz

Crossover (-12dB/Oct)

• Variable High-Pass : N/A
• Variable Low-Pass : 35Hz - 350Hz
• Variable Sub-Sonic : N/A

Fuse Ratings

• ATC : 35A x 3

Dimensions

• L x W x H : 6.42" x 6.85" x 1.9" (163.1 x 174 x 48.4)mm