Hifonics BG-520.4 BRUTUS BG 520 Watt Four Channel Amplifier
Key features
- Amplifier channels: 4
- Amplifier class: Class D
- Frequency response: 10Hz-30kHz
- High-pass crossover (12 dB/octave): 50Hz-5kHz
- Low-pass crossover (12 dB/octave): 50Hz-5kHz
- Speaker-level inputs: Yes
Hifonics BG-520.4 BRUTUS BG 520 Watt Four Channel Amplifier is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
Add four-channel power to your mobile audio system with the Hifonics BG-520.4 BRUTUS BG amplifier. Its Super D Class™ design delivers up to 520 watts of total power, with high-level inputs for connecting to factory stereos without RCA outputs.
Use it in four-channel stereo mode or in mono bridged operation. The illuminated badge can show steady blue light, switch off, or act as a VU meter to help with gain adjustment.
Key Features & Benefits
- Four-channel output: Choose stereo or mono bridged operation to suit your system configuration.
- Factory-system integration: High-level inputs accept speaker signals from OEM stereos without RCA outputs.
- Signal-sensing turn-on: DC Signal Sense can turn on the amplifier when it detects a signal at the high-level inputs.
- Variable crossovers: Select APF, HPF, or LPF settings across the stated 50Hz–5kHz range.
- VU meter badge: View audio levels on the illuminated logo while adjusting gain.
- Protection circuits: Over/under-voltage, short-circuit, and thermal protection help protect the amplifier and audio system.
Technical Specifications
| Brand | Hifonics |
|---|---|
| Series | BRUTUS BG |
| Amplifier type | Four Channel Amplifier |
| Amplifier class | Super D Class™ |
| Total channels | 4 |
| Maximum power | 520 W |
| Power output @ 2 Ohms | 4 x 125 W |
| Power output @ 4 Ohms | 4 x 75 W |
| Bridged power output @ 4 Ohms | 2 x 260 W |
| Frequency response | 10Hz - 30kHz |
| Signal to noise ratio | 92 dB |
| Total harmonic distortion (THD) | < 0.1% |
| Bass boost | 0 - 12 dB |
| Crossover | Variable Electronic 12dB Per Octave, APF, HPF, LPF (50Hz - 5kHz) |
| Power/ground terminal gauge | 4 AWG |
| Speaker terminal gauge | 12 AWG |
| Fusing | 2 x 30A |
| Color | Silver |
| Dimensions | 24.9 × 13.0 × 4.8 cm |
| Weight | 1.9 kg |
| Packaged dimensions | 32.3 × 20.8 × 9.3 cm |
| Packaged weight | 2.2 kg |
| Compatible vehicle fitment | Universal |
| Ultra-low EMI design | Shielded inductors are used in the BG series for increased sound quality that produces ultra-low EMI. |
| Mass-loaded heat sink | The mass-loaded extruded aluminum heat sink results in better thermal management and output performance. |
| High-end preamplifier circuit | Accepts a wider range of input signals. |
| RCA inputs | Nickel-plated RCA jacks create an efficient connection that is corrosion-resistant. |
| High-tolerance output device | BRUTUS BG amplifiers have MOSFETS designed for high output power and fast thermal dissipation through an SMT process that produces ultra-low EMI. |
| High-level inputs | Allow connection to OEM audio systems without RCA outputs. |
| Operation mode | 4 channel operation mode allows either stereo or mono bridged operation. |
| Clean board construction | 4-layer PCB design, using a thinner substrate, improves heat dissipation and enhances performance stability. |
| Class / topology | BG amplifiers feature a Class-D chipset, making them more efficient and allowing for a wide frequency range. |
| Power supply | Dual toroidal transformers paired with a high-frequency PWM drive result in higher power capacity compared to other transformer designs. The system is protected by a current overload limiter. |
| Delayed turn-on function | Designed to work with a wide range of source units and eliminate unwanted turn-on/off noises like hisses and pops. |
| Connection type | Secure molded connection terminal for Power, Ground and Speaker connections. Angled for ease of access while creating a clean wire management profile. |
| Stylized badging | Switch between full constant blue LED lights, VU Meter mode, or full off. In VU Meter mode, the amplifier’s logo reflects the audio level to assist with gain adjustment. |
| Triple protection circuits | Over/under voltage, short circuit, and thermal protection circuits protect the audio system and vehicle. |
| Auto turn-on | The DC SIGNAL SENSE switch allows the amplifier to turn on when a signal is received on the high-level inputs. An amplifier remote turn on wire is not needed for this function. Auto turn-on can also be switched off. |
| Compatibility | Compatible with standard 12V mobile audio systems and universal vehicle installations utilizing aftermarket RCA connections or factory OEM high-level speaker inputs. |
Why Choose This Product?
The BG-520.4 pairs four-channel output with connections for both aftermarket and factory audio systems. Its shielded inductors are designed to reduce electromagnetic interference, while the extruded aluminum heat sink and four-layer PCB support heat dissipation and stable operation.
Choose it when its listed channel ratings, crossover options, and connection types suit your system plan. The switchable badge adds a visible audio-level reference during gain adjustment.
Installation & Compatibility Notes
This amplifier is listed for standard 12V mobile audio systems and universal vehicle installations. It can connect through aftermarket RCA connections or factory OEM high-level speaker inputs.
Plan the installation around the specified 4 AWG power/ground terminals, 12 AWG speaker terminals, and 2 x 30A fusing. The Hifonics BRUTUS (BG) Amplifiers Quick Start Guide (Rev1) is listed as a product download.
Frequently Asked Questions
Can the BG-520.4 connect to a factory stereo without RCA outputs?
Yes. Its high-level inputs accept speaker-level signals, and DC Signal Sense can turn on the amplifier when it detects a signal at those inputs.
What is the bridged power output at 4 ohms?
The listed bridged output is 2 x 260 W at 4 Ohms.
What does the illuminated badge do?
You can select steady blue illumination, VU meter mode, or off. In VU meter mode, the logo reflects audio level to assist with gain adjustment.
What protection circuits are included?
The amplifier includes over/under-voltage, short-circuit, and thermal protection circuits.
What connections and fuse rating should I plan for?
The listed power/ground terminal gauge is 4 AWG, the speaker terminal gauge is 12 AWG, and the fusing is 2 x 30A.
Explore More
Shop the Hifonics BG-520.4 at 12 Volt Outlet. Want to learn more about Hifonics? Explore our Hifonics brand profile.
| Brand | Hifonics |
| Series | BRUTUS BG |
| Amplifier Type | Four Channel Amplifier |
| Amplifier Class | Super D Class™ |
| Total Channels | 4 |
| Max Power | 520 W |
| Power Output @ 2 Ohms | 4 x 125 W |
| Power Output @ 4 Ohms | 4 x 75 W |
| Bridged Power Output @ 4 Ohms | 2 x 260 W |
| Frequency Response | 10Hz - 30kHz |
| Signal to Noise Ratio | 92 dB |
| Total Harmonic Distortion (THD) | < 0.1% |
| Bass Boost | 0 - 12 dB |
| Crossover | Variable Electronic 12dB Per Octave, APF, HPF, LPF (50Hz - 5kHz) |
| Power/Ground Terminal Gauge | 4 AWG |
| Speaker Terminal Gauge | 12 AWG |
| Fusing | 2 x 30A |
| Color | Silver |
| Dimensions | 24.9 × 13.0 × 4.8 cm |
| Weight | 1.9 kg |
| Packaged Dimensions | 32.3 × 20.8 × 9.3 cm |
| Packaged Weight | 2.2 kg |
| Feature | Description |
|---|---|
| Compatible Vehicle Fitment | Universal |
| Ultra-Low EMI Design | Shielded inductors are used in the BG series for increased sound quality that produces ultra-low EMI. |
| Mass-Loaded Heat Sink | The mass-loaded extruded aluminum heat sink results in better thermal management and output performance. |
| High-End Preamplifier Circuit | Accepts a wider range of input signals. |
| RCA Inputs | Nickel-plated RCA jacks create an efficient connection that are corrosion-resistant. |
| High Tolerance Output Device | BRUTUS BG amplifiers have MOSFETS designed for high output power and fast thermal dissipation through a SMT process that produces ultra-low EMI. |
| High Level Inputs | Easily tie into OEM audio systems that do not offer RCA output to maximize after-market amplifier power. |
| Operation Mode | 4 channel operation mode allows either stereo or mono bridged operation. |
| Clean Board Construction | 4-layer PCB design, using a thinner substrate, improves heat dissipation and enhances performance stability. |
| Class / Topology | BG amplifiers feature a Class-D chipset, making them more efficient and allowing for a wide frequency range. |
| Power Supply | Dual toroidal transformers paired with a high-frequency PWM drive results in higher power capacity compared to other transformer designs. This system is protected by a current overload limiter. |
| Delayed Turn-On Function | Ensures compatibility with a wide range of source units to eliminate any unwanted turn-on/off noises like hisses and pops. |
| Connection Type | Secure molded connection terminal for all Power, Ground and Speaker connections. Angled for ease of access while creating a clean wire management profile. |
| Stylized Badging | Switch between full constant blue LED lights, VU Meter mode, or full off. When switched to VU Meter mode, the amplifier’s logo reflects the audio level, making it useful for gain adjustment. |
| Triple Protection Circuits | Over/under voltage, short circuit, and thermal protection circuits protect the audio system and vehicle under nearly every circumstance. |
| Auto Turn-On | The DC SIGNAL SENSE switch allows the amplifier to turn on when a signal is received on the high level inputs. An amplifier remote turn on wire is not needed to power on the amplifier. This feature can also be turned off. |
Frequently asked questions
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