STX Audio STX3000.1D 3000W Monoblock Class D Amplifier

The STX Audio STX3000.1D is a single-channel Class D car amplifier built to power a dedicated subwoofer system. Its monoblock layout focuses all available output on low-frequency reproduction, helping create a more substantial bass foundation than a head unit can provide alone. It is rated for operation down to a 1-ohm load, giving experienced installers flexibility when planning compatible subwoofer wiring.

This amplifier is intended for car-audio enthusiasts building a bass-focused upgrade or replacing a lower-output mono amp. Rated RMS output is specified at 800 watts at 4 ohms, 1,300 watts at 2 ohms, and 2,000 watts at 1 ohm. That range allows the amplifier to be matched to a variety of properly wired subwoofer configurations.

The STX3000.1D uses a Class D platform with a MOSFET circuit design. Class D amplification is suited to high-output subwoofer applications because it is designed for efficient power conversion, and this model is specified at over 85% efficiency. Its FR-4 printed circuit board and double-sided SMT construction are intended to support stable operation in a compact chassis.

Built-in tuning controls help integrate the amplifier with the rest of a vehicle audio system. The adjustable subsonic filter spans 5 to 50 Hz, while the adjustable low-pass filter covers 8 to 180 Hz. Bass-boost frequency and level controls provide further adjustment for installers who want to tailor low-frequency response to their enclosure and listening preferences.

The STX3000.1D fits into a complete system as the dedicated amplifier for compatible subwoofers. Its compact 16.4 x 7.3 x 2.3-inch dimensions can simplify placement in many trunk, hatch, or cargo-area installations. Built-in overload, short-circuit, thermal, and low-voltage protection systems add operational safeguards for demanding car-audio use.

Key Features

• 2,000W RMS at 1 Ohm: Provides the highest specified continuous output when paired with a properly wired 1-ohm subwoofer load.
• Monoblock Class D Design: Delivers single-channel amplification intended for dedicated subwoofer duty.
• MOSFET Circuit Design: Supports the amplifier's power-delivery architecture for bass-focused car-audio systems.
• Adjustable Crossover Controls: Subsonic and low-pass filters help set an appropriate bass operating range.
• Bass Boost Adjustment: Adjustable boost frequency and level controls allow additional low-frequency tuning.
• Protection Circuitry: Overload, short-circuit, thermal, and low-voltage safeguards help protect the amplifier during operation.

Design & Installation

The STX3000.1D combines a compact chassis with an FR-4 PCB, double-sided SMT construction, and a MOSFET-based Class D circuit design. Its black-and-orange exterior and finned side profile give it a purposeful amplifier appearance while the compact 2.3-inch height helps with placement where vertical clearance is limited.

Install the amplifier securely in a ventilated location and match it only with subwoofers whose final wired impedance is compatible with the selected load. Use properly sized vehicle power, ground, signal, and speaker wiring, and set the subsonic filter, low-pass filter, gain, and bass boost to suit the subwoofer enclosure and overall system. The available product information does not confirm included wiring or installation accessories, so plan for those separately.