About: Skar Audio SA-125.4D 4-Channel Car Amplifier - 180W RMS x 4

The Skar Audio SA-125.4D is a high-performance four-channel amplifier, designed to take your car audio system to the next level. Delivering a total of 720 watts RMS power, this Class D amplifier provides 125 watts x 4 channels at 4 ohms, 180 watts x 4 channels at 2 ohms, and an impressive 285 watts x 2 channels when bridged at 4 ohms. Its compact and efficient design makes it ideal for those seeking dynamic sound quality with minimal space requirements.

With a broad frequency response range of 10Hz to 25kHz, this amplifier ensures accurate and clear audio reproduction across all frequencies. Adjustable high-pass and low-pass filters (50Hz to 250Hz) allow you to fine-tune your sound for optimal performance. The amplifier’s 70A fuse rating and 4 AWG power/ground input size highlight its durable construction and reliable safety features.

The SA-125.4D includes user-friendly controls for gain and crossover adjustments, supporting HPF, LPF, and FULL modes to suit any audio setup. Additional features such as RCA preouts, high-level inputs, and auto remote turn-on functionality ensure seamless integration into any sound system. The amplifier’s LED status indicator provides clear operational feedback, with blue indicating normal operation and red signaling protection mode.

Compact in size, this amplifier is designed for easy installation and includes a removable terminal design that streamlines both setup and maintenance. Whether you’re upgrading a stock system or building a custom high-performance setup, the SA-125.4D delivers the precision, power, and reliability you need for an exceptional audio experience.

Specifications: 

• Type: Multichannel Car Amplifier
• Class: D
• Power Handling: 
• RMS Power at 2 Ohms: 180 Watts x 4 Channels (14.4v)
• RMS Power at 4 Ohms: 125 Watts x 4 Channels (14.4v)
• RMS Power at 4 Ohms (Bridged): 285 Watts x 2 Channels (14.4v)
• Bridgeable: Yes
• Strappable: No
• Fuse Rating: 70 Amp
• MOSFET Type: High Speed MOSFET Power Supply
• Bass EQ (Boost): No
• Output Channels: 4
• RCA Line Output: Yes
• Turn-On Circuit: Soft Turn-on Circuit
• Working Voltage: 8.5V - 16V
• Tri-Mode Capable: Yes
• Frequency Response: 10Hz - 25kHz
• Built-in Crossovers: HPF / Full-Range / LPF
• Protection Built-in: Yes - 4-Way (Thermal‚Voltage‚Speaker‚DC)
• Power & Ground Inputs: 4 Gauge
• Low Pass Filter (Variable): 50Hz - 250Hz
• High Pass Filter (Variable): 50Hz - 250Hz
• Power & Protection Indicators: Yes - LED Indicators
• Remote Bass Knob & Cable Included: No
• Channel 1/2 Crossovers
• Crossover Type (Switchable): High-Pass Filter / Full-Range / Low-Pass Filter
• Dimensions (W x H x L): 5.98" x 2.12" x 10.43" 

Real World Amplifier Dyno Test Results: 

• Dynamic (Peak) Power at 2 Ohms: 295 Watts x 4 Channels (14.3v)
• Dynamic (Peak) Power at 4 Ohms: 183 Watts x 4 Channels (14.5v)
• Certified (RMS) Power at 2 Ohms: 277 Watts x 4 Channels (14.25v)
• Certified (RMS) Power at 4 Ohms: 170 Watts x 4 Channels (14.4v)