Nuprime Evolution TWO SE silver

The NuPrime Evolution Two-SE is a mono amplifier from the Evolution Two series. It delivers 300 W into 8 ohms and 600 W into 4 ohms. This version incorporates measures aimed at reducing distortion, going beyond a mere cosmetic update.

ODC technology: a new approach to error correction

At the heart of the Evolution Two-SE is a proprietary technology called ODC (Only Distortion Cancellation). Unlike traditional correction systems that invert the output signal to compare it with the input, ODC extracts error signals directly from the MOSFETs and filtering circuits. This radically different approach minimizes the use of conventional negative feedback.

The result? Total harmonic distortion lower than 0.001% at 1 kHz for 5 W of power, and still under 0.002% even at 200 W. These figures aren’t just a technical feat on paper: they translate into a sonic purity that makes you forget you’re listening to a switching amplifier. The newly selected MOSFETs deliver three times the peak current of their predecessors, allowing effortless control of demanding loads down to 2 ohms.

Uncompromising technical construction

The Evolution Two-SE doesn’t skimp on component quality. LME49860 op-amps replace the MUSES8820 from the previous model in the preamplification and Class-D oscillation stages. These ICs, coupled with military-grade feedback resistors with a 15 ppm tolerance, ensure remarkable thermal stability and signal accuracy.

The heatsink, CNC-machined from aerospace-grade aluminum, maintains a consistent operating temperature even during demanding musical passages. This thermal management enables the amplifier to sustain optimal performance without variation, regardless of listening duration.

The power supply forms the backbone of the machine: a toroidal transformer with 900 W peak power, backed by a total capacitor bank of 48,400 µF per channel. 40-amp connectors and PCB copper traces replace traditional wiring, maximizing energy transfer between the power supply and the amplification circuits.

A switching frequency that makes the difference

The 650 kHz switching frequency deserves attention. Higher than many competitors, it enables superior sonic resolution by pushing switching artifacts well beyond the audible spectrum. In practice, this technical feature yields a more natural rendering of harmonics and micro-details, particularly noticeable on complex acoustic recordings.

The Hybrid Class-D approach: the best of both worlds

NuPrime employs what they call Hybrid Class-D technology, merging the sonic qualities of Class A with the energy efficiency of Class D. This approach achieves a warm, natural sonic signature without the thermal and energy drawbacks of purely Class A amplifiers. Idle consumption remains modest (14–16 W), while the high efficiency limits heat dissipation even at full power.

Expansive and precise spatial reproduction

The Evolution Two-SE projects a soundstage of unusual scale for a switching amplifier. The depth of the stereo image lets you clearly distinguish the back rows of a symphony orchestra, down to the subtle pedal noises of a concert piano. This spatiality never sacrifices precision: each instrument retains its defined position in the sound field, without blur or confusion even during the most complex crescendos.

Low-frequency control is particularly impressive. The amplifier maintains complete command of the bass, with no overhang or bloat, while preserving the texture and nuances of low-register instruments. Acoustic double basses keep their characteristic woody tone, and synthesizers their distinct electronic textures.

Connectivity and practical use

The rear panel of the Evolution Two-SE remains minimalist yet functional. It features a balanced XLR input using a Neutrik NC3FD-L-B-1 connector and an unbalanced RCA input with a Furutech FP-900(G) connector, selectable via a switch. ETI BP-20C binding posts accept all speaker cable terminations. A 12 V trigger input allows integration into home automation systems or automatic activation from a compatible preamplifier.

The mains voltage selector (115 V/230 V) facilitates international use, while a 7 A fuse protects the device. The front-panel power button requires an 8-second press to turn on or off, preventing accidental operation.

Technical specifications

Technologies and innovations

• ODC Class D technology: direct extraction of error signals from the MOSFETs and filtering circuits, minimizing traditional negative feedback
• Next-generation Class D MOSFETs: peak current tripled to drive demanding speakers, 2 Ω compatible
• Precision thermal management: CNC-machined heatsink in aerospace-grade aluminum for thermal stability and sustained performance
• Ultra high-end components
  • LME49860 operational amplifiers in the preamplification stage and Class D oscillator
  • Military-grade 15 ppm feedback resistors
  • Optimized Class D feedback circuit and resistors
• Ultra-stable power supply
  • 900 W high-power toroidal transformer
  • Total capacitor capacity: 48,400 µF per channel
  • 40 A low-resistance connectors
  • Copper PCB traces for maximum current distribution
• High-speed 650 kHz switching frequency for superior resolution
• Hybrid Class D design: combines the advantages of Class A and Class D for warm, natural, and dynamic sound

Audio performance

• Expansive soundstage with an inky-black background
• Authoritative bass control and precision across the entire spectrum
• Detail preservation at 200 W: micro-details and orchestral nuances faithfully reproduced
• Warm, natural tonality reminiscent of Class A amplifier sound
• Ultra-low distortion with fast dynamics and full-band power

Electrical specifications

• Continuous power: 300 W into 8 Ω, 600 W into 4 Ω
• Peak power: 410 W into 8 Ω, 820 W into 4 Ω
• Gain: 26.44 dB
• Voltage gain: 21
• Input sensitivity: 2.1 Vrms
• Input impedance: 47 kΩ
• Output impedance: 2 mΩ
• THD+N: 0.001% at 1 kHz (5 W), 0.002% at 1 kHz (200 W), 0.002% from 2 W to 200 W
• Frequency response: 10 Hz – 50 kHz (-3 dB)

Power and consumption

• Mains supply: 115 V / 230 V, selection switch
• Standby consumption: 1 W
• Idle consumption: 14 – 16 W
• Mains fuse: time-delay 7 A, 250 VAC

Connectivity

• Trigger: input

Dimensions and weight

• Unit dimensions (H x W x D): 57 x 430 x 375 mm
• Unit weight: 10.5 kg
• Package dimensions: 64.2 x 594 x 254 mm
• Package weight: 14 kg
• Available finishes: black, silver

Highlights

• ODC Class D technology for ultra-low distortion
• 2 Ω compatible for demanding speakers
• Dynamic capabilities and sound resolution comparable to Class A
• High-end components: LME49860, optimized MOSFETs, ultra-precise resistors
• 900 W power supply and high-capacity capacitors for stable power delivery
• Pure mono architecture for optimal separation and an exceptional soundstage