Hifonics BXX4000.1D Brutus 4000W Mono Subwoofer Amplifier

The Hifonics BXX4000.1D Brutus is a mono Class D amplifier designed to power car subwoofer systems. It delivers up to 4,000 watts RMS into a 1-ohm load, with lower rated output options at 2 and 4 ohms. It is intended for installations that need a dedicated amplifier for low-frequency reproduction rather than full-range speakers.

This amplifier suits builders matching one or more subwoofers to a high-output mono channel. Its variable low-pass crossover and subsonic filter allow the bass range to be tailored to the subwoofers and enclosure. An adjustable bass boost and phase control provide further system-tuning options.

The BXX4000.1D uses Super D/Class D amplification and an Ultra-Fi MOSFET output circuit. Hifonics also specifies an NGSD digital chip design as part of its power-amplification platform. The design is paired with an aluminum alloy heat sink for heat dissipation during operation.

For signal integration, the amplifier uses RCA audio inputs and provides RCA connections for master/slave linking. It is strappable with a second compatible amplifier, allowing a linked pair to be used in a larger bass system. A wired remote bass-level control is included for convenient adjustment from the listening position.

The amplifier is 1-ohm stable and requires subwoofers to be wired to a supported final impedance. It includes power and protect status indicators, built-in diagnostics, and protection circuitry for thermal, overload, and speaker-short conditions. Its high-current installation requirements make careful power, ground, fuse, and ventilation planning important.

Key Features

• 4,000W RMS at 1 Ohm: Supplies substantial mono power for a properly matched subwoofer load.
• Super D/Class D Topology: Provides an efficient amplifier platform for dedicated bass systems.
• Variable Low-Pass Filter: Adjusts the subwoofer passband from 35 to 250 Hz.
• Subsonic Filter: Filters frequencies from 15 to 35 Hz for enclosure-aware tuning.
• Strappable Operation: Supports master/slave linking with another compatible amplifier.
• Wired Bass Remote: Lets the user adjust bass level from the front seat.

Design & Installation

The BXX4000.1D is a single-channel amplifier with an aluminum alloy heat sink, Ultra-Fi MOSFET circuitry, and LED power/protect indicators. Its control panel includes adjustments for input level, low-pass crossover, subsonic filtering, bass boost, and phase. RCA input and linking connections support use in dedicated subwoofer systems and paired-amplifier configurations.

Install the amplifier in a secure, dry, well-ventilated location with space around the heat sink. Use appropriately sized power and ground wiring, an external 275A fuse, and a solid chassis ground; the listed power and ground terminal capacity is 0 AWG. Match the connected subwoofer wiring to a final load no lower than 1 ohm, then set gain and filters carefully to suit the enclosure and system.