Nuprime Fusion-2X

NuPrime’s Fusion-2X delivers 500 watts per channel into both 4 ohms and 8 ohms—a rare technical feat that speaks to an exceptionally robust design. Capable of handling continuous loads down to 3 ohms and even 2-ohm peaks, it adapts to the most demanding speakers while maintaining exemplary stability. Its adjustable gain from 34× to 50× allows for optimal integration into any high-end audio system.

A technical design that defies conventions

At the heart of the Fusion-2X is a unique integration between the power supply and the Class-D amplification circuit, operating at a high switching frequency of 700 kHz. This frequency, well above the usual 300 kHz standard, reduces MOSFET temperatures by 30%, ensuring optimal operation even at full power. Custom metal modules housing the power stage and the Class-D module create a highly effective Faraday cage, isolating the electronics from external electromagnetic interference while eliminating any mechanical vibration likely to cause audible hum.

A dedicated power supply for each channel is the backbone of this design. Six 2200 µF capacitors per channel, combined with a 15A-grade high-frequency filter, ensure a substantial instant energy reserve. This configuration not only sustains a maximum current of 15 amperes into 4 ohms, but also drastically reduces interchannel crosstalk and residual power-supply noise. The capacitors are integrated directly into the amplification circuit, thereby minimizing signal paths and enabling lightning-fast transient response.

The Fusion-2X’s fully balanced input topology deserves special attention. With an input impedance of 47 kΩ and a sensitivity of 2 Vrms to reach rated power, the amplifier interfaces perfectly with any modern preamplifier. This balanced design significantly reduces interference and noise, particularly over long cable runs, ensuring the signal remains intact from source to loudspeakers.

Measurable performance that speaks for itself

The Fusion-2X’s figures tell a story of technical precision rarely achieved in this category. With total harmonic distortion plus noise (THD+N) of just 0.007% at 5 watts and 0.02% at 100 watts at 1 kHz, the amplifier maintains remarkable signal purity at any listening level. The signal-to-noise ratio, reaching 100 dB at 10 watts and 110 dB at 100 watts, creates a deep black background from which music emerges with striking clarity.

Frequency response extending from 10 Hz to 50 kHz comfortably exceeds the human audible spectrum. This generous bandwidth preserves upper harmonics and subtle spatial information that contribute to realistic sound reproduction. Each channel features its own ultra-fast protection circuit, capable of instantly disconnecting the speaker output in the event of a fault, thereby preserving the integrity of the entire system.

The Fusion series: a versatile vision of high fidelity

The Fusion-2X is part of the Fusion lineup created specifically under the NuPrime-X brand, a division dedicated to custom installation, home theater, and gaming markets. This series represents an innovative approach where versatility never compromises quality. Unlike traditional amplifiers that excel either in stereo or multichannel, the Fusion-2X moves effortlessly between the subtleties of an intimate jazz recording and the dynamic demands of a modern film soundtrack.

This versatility is no accident but the result of meticulous design, where every component is selected for its ability to handle complex, varied signals. The Fusion’s proprietary Class-D module, with minimal distortion measured at 0.004% at 5 watts, preserves the micro-details essential to musical reproduction while maintaining the ability to deliver powerful transients required by cinematic special effects.

Technical Specifications

Power and Electrical Performance

• Output power (RMS): 500 W × 2 @ 4 Ω, 500 W × 2 @ 8 Ω
• Maximum current: 15 A @ 4 Ω
• Stability with complex loads: up to 3 Ω continuous, 2 Ω peak

Input Characteristics

• Input sensitivity: 2 Vrms for rated power
• Input impedance: 47 kΩ
• Adjustable gain: factor 34× to 50× (example: 1 V input → 34 V output)

Audio Performance

• Frequency response: 10 Hz – 50 kHz
• Total harmonic distortion + noise (THD+N):
  • 0.007% @ 5 W / 1 kHz
  • 0.012% @ 50 W / 1 kHz
  • 0.02% @ 100 W / 1 kHz
• Signal-to-noise ratio:
  • 100 dB @ 10 W
  • 110 dB @ 100 W

Capabilities and Highlights

• High-power dual-channel design for hi-fi / home theater use
• Exceptional stability with complex loads down to 2 Ω peak
• Transparency and speed typical of the NuPrime signature
• Audiophile-grade construction with low-noise, wide-bandwidth components
• Clean, compact design for easy integration into any high-end system