STX Audio STX2000.1D 2000W Class D Monoblock Amplifier

The STX Audio STX2000.1D is a mono Class D car amplifier designed to power a subwoofer system. It provides a dedicated bass channel rather than splitting output among full-range speakers. This makes it a practical choice for car audio systems that need controlled low-frequency reinforcement.

Rated for up to 2000 watts maximum output, the STX2000.1D is specified at 1000 watts RMS into a 1-ohm load. It is also rated at 600 watts RMS at 2 ohms and 500 watts RMS at 4 ohms. These ratings give installers flexibility when selecting and wiring compatible subwoofers.

The amplifier uses a Class D design with MOSFET circuitry to support efficient power delivery in a compact chassis. Its published efficiency exceeds 85%, helping reduce wasted energy compared with less-efficient amplifier designs. The mono-channel layout is purpose-built for bass duty rather than multi-speaker amplification.

Built-in tuning controls allow the amplifier to be adjusted for the subwoofer and enclosure being used. A variable subsonic filter, low-pass filter, bass-boost frequency control, and bass-boost level control provide useful setup range. Careful adjustment helps integrate the subwoofer with the rest of the vehicle audio system.

The STX2000.1D is a compact option for an aftermarket bass upgrade where space matters. Its freestanding mounting design suits common amplifier-installation locations such as a trunk, cargo area, or an appropriately ventilated custom panel. Integrated overload, short-circuit, thermal, and low-voltage protection circuits support dependable operation when the system is correctly installed.

Key Features

• Mono Class D Design: Delivers one dedicated channel for a subwoofer system.
• 1-Ohm Stable Output: Supports compatible subwoofer loads down to 1 ohm.
• 1000W RMS at 1 Ohm: Provides its highest published continuous power rating.
• Adjustable Low-Pass Filter: Helps limit output to bass frequencies for subwoofer use.
• Subsonic Filter: Allows low-frequency protection and enclosure-specific tuning.
• Integrated Protection Circuits: Includes overload, short-circuit, thermal, and low-voltage protection.

Design & Installation

The STX2000.1D uses a high-quality FR-4 printed circuit board with double-sided SMT construction. Its MOSFET circuit design and compact 10.5 x 7.3 x 2.3-inch form factor are intended to combine power capability with space-conscious installation. The amplifier is listed with a freestanding mounting type and a single-channel configuration.

Match the amplifier to subwoofers whose final wired impedance is 1, 2, or 4 ohms, and use the corresponding published RMS rating as the power reference. Install it with properly sized vehicle power, ground, speaker, and signal wiring selected for the overall system, and mount it where ventilation is available. Set the subsonic filter, low-pass filter, and bass controls conservatively during initial setup, then fine-tune them for the vehicle and enclosure.