The BRZHIFI FM411 (often produced by Weiliang Audio) is a high-fidelity power amplifier designed as a tribute to the legendary Swiss FM Acoustics FM411. It delivers 260 W × 2 at 4 Ω and 130 W × 2 at 8 Ω, operating in Class A and B to offer pristine, transparent audiophile-grade sound.

 

Technical Specifications

• Output Power: 260W × 2 (into 4Ω load), 130W × 2 (into 8Ω load)
• Frequency Response: 10Hz - 30kHz (-1dB)
• Signal-to-Noise Ratio (SNR): -92dB to -105dB depending on the variant
• Distortion (THD): < 0.005% to 0.008% (at 65WRMS)
• Damping Coefficient: 167 (at 4Ω), 301 (at 8Ω)
• Input Impedance: 1MΩ + 1MΩ (XLR balanced inputs only)
• Static Power Consumption: 90W
• Voltage Rating: AC 220V (internally switchable to 110V on the chassis bottom)
• Dimensions: 430 × 422 × 167 mm (Width × Depth × Height)
• Weight: 22.5 kg

 

Key Design & Structural Features

• Circuit Design: Emulates the highly-regarded FM Acoustics architecture, renowned for its unlimited repetitive peak output current and zero use of overall negative feedback. It can safely drive complex, low-impedance speaker systems (from 1Ω to 16Ω) without distortion.
• Chassis Build: Pays aesthetic homage to the classic FM Acoustics look. It utilizes high-precision steel plate bending and heavy-duty panels, which provide structural stability and eliminate mechanical resonance.
• Thermal Management: Engineered with highly efficient ventilation holes for passive heat dissipation, keeping the amplifier operating safely despite the Class AB thermal load.

 

Build & Structural Design

The amplifier employs heavy-duty, customized high-power transistors and is housed in a robust, CNC-machined aluminum and cold-rolled steel chassis. Unlike standard stamped enclosures, BRZHIFI’s specialized bending process ensures optimal structural integrity and heat dissipation, alongside dedicated cutouts for wiring. Internally, it features high-capacity toroidal transformers and robust capacitor banks designed to manage high peak currents while suppressing electromagnetic interference.

Because of its specific circuitry, this model is targeted at serious audiophiles and requires dedicated pre-amplification.

 

Push-Pull Amplifier Circuit

Every Musical Detail Is Fully Revealed

The push-pull amplifier circuit achieves signal amplification by alternating the operation of two sets of complementary transistors. It requires precise matching of complementary components and a sophisticated control circuit, resulting in high efficiency and low distortion. It provides high output power and high output current while helping reduce power supply ripple.

 

Carefully Selected Brand Components, Precisely Paired

For instance, the gold-sealed power transistors we choose are all rigorously tested and carefully paired, with only the finest linear, ultra-high-specification components selected. The same principle applies to FM’s power amplifier circuit.

 

The output stages across the entire product line use power transistors of the same polarity, making precise matching easier and more consistent. The critical input stage places extremely high demands on the differential circuit components, helping ensure exceptionally low distortion and faithful reproduction of the original sound.

 

As a result, FM’s sound quality stands out among many brands and is often associated with premium, high-end performance.

 

High-Power Transformer

Using a transformer with a Nippon Steel core and pure copper windings, this 800W high-quality amplifier provides ample power reserves for a 260W output, ensuring powerful performance and precise control over the speakers without compromise.

Features:

* 800W Transformer

* Pure Copper Windings

 

ON Ansonmei Audio High-Power Transistor

ON Semiconductor power transistors are designed specifically for high-power audio applications. With key advantages such as high voltage tolerance, high power handling, and low distortion, they serve as the core output devices in power amplifiers and are ideally suited for symmetrical push-pull amplifier circuits.

 

Their stable performance and clean, accurate sound reproduction have made them a classic choice for high-end audio equipment.

FM’s Unique Black Box

By increasing the power supply’s filter capacitor capacity, the amplifier achieves more stable current delivery, reduces impedance fluctuations, and improves its ability to drive low-impedance speakers. This also enhances dynamic range and channel separation, resulting in cleaner, more stable, and more accurate sound reproduction.

 

Unique Protection System

FM’s proprietary protection circuit continuously monitors the amplifier through a microcomputer-controlled system. It detects and protects against abnormal operating conditions such as:

* Short circuits

* Open circuits

* High-frequency oscillation

* Radio-frequency (RF) interference caused by preamplifiers or ground loops

* Overheating

* Faults within the protection system itself

This comprehensive protection helps ensure reliable operation while safeguarding both the amplifier and connected speakers.