Description

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Powerful and exquisite voice. Excellent value, allowing you to experience a linear surge.

SP AUDIO BLACK WIDOW NHB-368MK3 MAX

Fully Balanced Dual-Mono Power Amplifier — 2026 Edition

The New Generation of Black Widow

The 2026 SP Audio Black Widow NHB-368MK3 MAX represents a major evolution of the highly regarded NHB-368THREE. Designed for listeners who demand exceptional power, transparency and musical refinement, the new MAX version combines extreme current capability with an uncompromising, no-negative-feedback amplifier topology.

The NHB-368THREE became known for its natural, rich, transparent and highly musical presentation. The NHB-368MK3 MAX takes this concept considerably further, with substantially greater power reserves, upgraded PCB technology and carefully selected components.

After eight months of engineering development, circuit refinement and component selection, SP Audio further optimized the PCB layout in May 2026. The objective was clear: reduce signal losses, improve high-frequency refinement and extract an even higher level of detail and musicality.

Silver-Plated PCB Technology

To maximize signal integrity, the PCB incorporates a silver-plated manufacturing process, designed to minimize transmission losses and improve the reproduction of delicate musical information.

The result is intended to deliver:

• Greater micro-detail
• More refined high frequencies
• Faster and cleaner signal transmission
• Increased transparency
• A more effortless and musical presentation

The PCB uses 2.5 mm thick copper construction with 9999-purity silver plating, an exceptionally high-investment approach designed to provide extremely stable signal transmission.

The circuit layout has also been optimized so that delicate audio signals follow the shortest possible paths, minimizing signal loss. A single-point grounding architecture is employed, with distortion specified below 0.001%.

True Dual-Mono Power Architecture

The NHB-368MK3 MAX is designed as a genuine dual-mono power amplifier, with each monoblock equipped with a high-quality 2,000 W transformer and two high-power rectifiers.

The power supply is supported by four SP Audio custom 47,000 µF capacitors, providing a total filter capacity of 188,000 µF.

This enormous energy reserve is designed to ensure stable power delivery even during demanding musical peaks, allowing the amplifier to maintain authority, control and dynamic impact.

The result is an amplifier engineered for:

• Deep and powerful bass
• High instantaneous current delivery
• Large-scale dynamics
• Strong speaker control
• Effortless reproduction of complex musical passages

Custom pure-copper connectors are also used to optimize power and signal transmission.

No-Negative-Feedback Circuit Design

The NHB-368MK3 MAX uses a no-negative-feedback amplifier topology, avoiding large amounts of global negative feedback.

This design philosophy is intended to preserve the natural character of the musical signal while delivering high transparency, speed and dynamic expression.

Combined with the substantial power supply and carefully optimized PCB layout, the amplifier is designed to provide both serious authority and highly refined musical reproduction.

Connectivity

The rear panel provides:

• XLR balanced input
• RCA single-ended input
• Speaker output
• High-quality power supply architecture

The amplifier is designed to drive a wide range of demanding loudspeakers.

Power Output

The NHB-368MK3 MAX delivers substantial power reserves:

The user-selectable amplifier gain is 26–32 dB, referenced to 8 Ω.

This combination of high power and substantial current capability is intended to provide exceptional control, especially with difficult speaker loads.

Technical Specifications

• Frequency response:7 Hz – 700 kHz, +0 / -3 dB
• Rise time:< 0.8 µs
• Slew rate:> 200 V/µs peak-to-peak
• DC output voltage:±25 mV
• Signal-to-noise ratio:>110 dB (A), nominal power
• Speaker output impedance:<0.28 Ω from 20 Hz–20 kHz
• Distortion:specified by SP Audio at <0.001% in the circuit design
• Standby consumption:3 W
• Idle consumption:85 W
• Transformer:2,000 W per monoblock

Minimalist SP Audio Design

The exterior follows SP Audio’s characteristic minimalist design philosophy.

The front panel deliberately avoids unnecessary controls and visual clutter. A 7-inch LCD display and elegant gold-plated nameplate provide the essential information while maintaining a clean, sophisticated appearance.

The philosophy is simple:

Less visual complexity. More engineering. More music.

Built for Serious Loudspeakers

With 400 W into 8 Ω, 700 W into 4 Ω and up to 1,500 W into 2 Ω, together with a 2,000 W transformer and 188,000 µF of power-supply capacitance, the NHB-368MK3 MAX is engineered to deliver substantial power reserves when the music demands them.

It is particularly suited to listeners seeking a combination of:

Power + Speed + Control + Transparency + Musicality

Dimensions & Weight

Dimensions: 250 × 426 × 466 mm (W × H × D)
Net weight: 40 kg per monoblock

SP AUDIO BLACK WIDOW NHB-368MK3 MAX

Extreme power. Refined engineering. Pure musical ambition.

The NHB-368MK3 MAX is not simply a higher-powered version of the 368 series. It represents SP Audio’s latest effort to push the platform further through upgraded PCB technology, an enormous power supply, optimized signal paths and a carefully developed no-negative-feedback topology.

For listeners who want serious power without sacrificing refinement, transparency and musicality, the Black Widow NHB-368MK3 MAX is designed to