Hifonics BXX2000-1D 1-Ohm Mono Subwoofer Amplifier

The Hifonics BXX2000-1D is a mono car audio amplifier designed to power a subwoofer system from a single channel. It is stable to a 1-ohm final load and provides selectable output ratings for 1-, 2-, and 4-ohm subwoofer wiring configurations. This makes it suited to systems that need dedicated low-frequency amplification rather than full-range speaker channels.

This amplifier is intended for listeners building a bass-focused upgrade around compatible passive subwoofers. Its electronic low-pass crossover, subsonic filter, bass boost, and phase adjustment allow the subwoofer output to be tailored to the rest of the vehicle audio system. RCA inputs support connection from a source unit or signal processor with compatible preamp outputs.

The BXX2000-1D uses Super D-Class circuitry with a pulse-width-modulated MOSFET power supply and Ultra-Fi MOSFET output devices. Its published frequency response is 10 Hz to 250 Hz, covering the range typically used for subwoofer reproduction. A variable low-pass filter helps keep higher frequencies out of the subwoofer channel for a cleaner blend with main speakers.

For system tuning, the amplifier provides adjustable input sensitivity, 0 to 10 dB bass boost, a 15 to 35 Hz subsonic filter, and variable phase control from 0 to 180 degrees. These controls allow an installer to match the amplifier to the source signal, enclosure design, subwoofer capabilities, and vehicle acoustics. The included wired bass-level remote provides convenient level adjustment from the cabin.

The BXX2000-1D is a practical fit for an aftermarket subwoofer stage using a compatible final impedance of 1, 2, or 4 ohms. Dual speaker terminals simplify connecting multiple subwoofer leads while maintaining the correct final load. It can also feed another amplifier through its RCA outputs when expanding a larger audio system.

Key Features

• Mono Subwoofer Channel: Dedicated single-channel design for powering a bass system.
• 1-Ohm Stable Operation: Supports a properly wired final load as low as 1 ohm.
• Selectable Power Ratings: Delivers rated output at 1-, 2-, or 4-ohm loads.
• Electronic Low-Pass Crossover: Adjusts the upper frequency limit sent to subwoofers.
• Wired Bass Remote: Enables convenient subwoofer-level adjustment from the driver area.
• Protection Diagnostics: LED indicators show normal operation or protection status.

Design & Installation

The amplifier uses a heavy-duty aluminum-alloy heat sink to help manage operating heat. Its Super D-Class platform incorporates a pulse-width-modulated MOSFET power supply and Ultra-Fi MOSFET outputs. Green power and red protection indicators provide visible operating-status feedback.

Mount the amplifier securely in a dry, ventilated location and use appropriately sized power and ground wiring. The power and ground terminals accept 0 AWG cable, while the speaker terminals accept 10 AWG wire. Use an external 200A fuse, connect a source through RCA inputs, and verify that the connected subwoofers present no less than a 1-ohm final impedance.