NuPrime

NuPrime Evolution STA Power Amplifier

$6,475.00 CAD

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The Evolution STA-SE sets a new standard in distortion reduction with its Only Distortion Cancellation (ODC) technology and proprietary ultra-low-noise GaN (Gallium Nitride) power supply. This combination delivers exceptional clarity, a deep and expansive soundstage, high dynamic range, and warm, Class A-like tonal characteristics. Featuring a dual-mono stereo configuration, the amplifier outputs 400W x 2 at both 8 Ohm and 4 Ohm loads.

The New Benchmark in Reference Stereo Power

The NuPrime Evolution STA-SE is not merely an update; it is a reimagining of what a reference-class stereo power amplifier can achieve. By combining our award-winning Only Distortion Cancellation (ODC) technology with a revolutionary ANC GaN (Gallium Nitride) Power Supply, the STA-SE delivers an staggering 400W per channel of pure, effortless authority.

Building on the “giant-killing” reputation of its predecessor, the Special Edition pushes the boundaries of transparency, speed, and musicality, offering the liquid warmth of Class-A with the surgical precision and explosive dynamics that define the NuPrime sound.

The STA-SE continues to utilize NuPrime’s breakthrough Only Distortion Cancellation (ODC) Class-D design:

Unlike traditional designs that use a global feedback loop, ODC derives its error signal directly from the MOSFET devices and output filter. This approach resulted in a substantial reduction in distortion THD+N of 0.002%. This surgical level of precision results in a sound that is entirely neutral and transparent.
High-Speed Resolution: Operating at a 650kHz switching frequency, the STA-SE captures the complex harmonic structure of live music, delivering a “holographic” soundstage that is both wider and deeper than its predecessor.

Revolutionary ANC GaN Power Supply Technology

Advanced GaN Power Factor Correction with Active Noise Cancellation

How it Works:

The ANC Feedback Loop: Much like high-end noise-canceling headphones, the STA-SE’s power supply monitors the AC line for noise and ripple. It then generates an “anti-noise” signal to cancel out interference in real-time. This reduces power supply noise to levels previously thought achievable only by massive, expensive linear transformers.
Dual-Phase Interleaved Topology: By interleaving two power phases, the STA-SE significantly reduces ripple current and ensures a smoother, more stable delivery of energy.
Efficiency Meets Authority: The GaN semiconductors operate at switching speeds far beyond traditional silicon. This allows for near-instantaneous current delivery (up to 40A) and a near-perfect power factor, ensuring that the amplifier remains cool and unshakeable even when driving the most difficult, low-impedance speakers.

Gallium Nitride High Frequency High Efficiency Power Module (Gan HFHFPM)

Beyond the PFC stage, the Evolution STA-SE employs new-generation GaN semiconductor modules for the critical power conversion stages that supply the amplifier circuits. The choice of GaN semiconductors over traditional silicon-based solutions enables this extraordinary power density (400W x 2) while maintaining excellent thermal characteristics and switching efficiency. This translates to reduced heat generation and improved long-term reliability.

Engineering Excellence Through Miniaturization

Perhaps most remarkably, this advanced power supply system delivers performance equivalent to traditional transformer-based power supplies while occupying only one-fourth the physical space and weighing merely 20% of conventional designs. This dramatic reduction in size and weight opens new possibilities for amplifier design and placement flexibility without compromising performance.

The Sonic Signature: “Liquid Precision”

The Bass: Authoritative, rock-solid, and richly textured. With high current capability and exceptional control, low frequencies are delivered with speed, weight, and precision — not just heard, but felt, maintaining perfect timing even in complex passages.
The Midrange: Full-bodied, natural, and saturated with a Class-A-like warmth inspired by the NJR MUSES8820 op-amp stage. Vocals and instruments possess a lifelike presence, allowing the speakers to disappear within a wide and deep soundstage that reveals even the most subtle details without artificial enhancement.
The Treble: Refined, airy, and extended, free from the ringing or brightness often associated with high-power switching amplifiers. Ultra-low distortion and a clean background ensure delicate nuances emerge with purity and realism.
Dynamics: Fast, expansive, and effortlessly powerful. From the subtlest micro-details to large-scale orchestral crescendos, the presentation maintains clarity at the deepest layers, offering greater dynamic range, scale, and transparency throughout.

Technical Highlights

Massive Output: 400W x 2 RMS @ 8 Ohms and 4 Ohms. The maximum RMS output is 400W per channel; therefore, both 4-ohm and 8-ohm loads receive the same power.
Dual-Mono Configuration: Truly independent power paths for left and right channels to eliminate crosstalk and maximize imaging precision.
High-Speed Switching: Operating at 650kHz, the switching frequency allows for a resolution that approaches the finest analog designs.
The entire power path fully adopts 40A ultra-high current and low resistance terminals. Improve current dynamic capability. Total of 52,000uF power supply filter capacitors.
Preamp stage and Class D oscillation circuit utilizing high-end NJR MUSES8820 op-amp.
Featuring Furutech FP900 RCA inputs and high-conductivity binding posts for an uncompromized connection.
High quality copper PCB trace instead of usual cables are used to connect the power supply to the amplifier’s circuitry, maximizing power delivery.
Resonant-Free Chassis: Mounted on NuPrime’s proprietary vibration-damping isolation feet.

Why the Evolution STA-SE?

Reviewers of the original STA noted it was “difficult to criticize” and “kept them listening late into the night.” The STA-SE takes that winning formula and adds nearly double the power and a next-generation GaN power architecture. It is the ultimate choice for the audiophile who demands the soul of a tube amp and the muscle of a powerhouse solid-state, without the heat, weight, or distortion of either.

Specifications:

Power Output (RMS): 400W @ 8 Ohms , 400W @ 4 Ohms
Gain: x21
Sensitivity (to rated power): 2Vrms
Input Impedance: 47K Ohms
Output Impedance: 4m Ohm
Furutech FP900 RCA input connectors and Eichmann binding post.
WATT / THD / S/N (typical) : @5W (0.0025% ,95db) , @50W (0.007% , 105db) , @100W (0.01% , 110db)
Frequency Response: 10Hz to 50kHz (-3dB)
Trigger IN and OUT
Standby Power : 1.5W @ 115V outlet, 1.7W @ 230V outlet
Idle Power : 24W @ 115V outlet, 26W @ 230V outlet
Worldwide AC voltage: (115VAC / 230VAC) with Voltage Select Switch
AC Fuse : Slow blow , 7A , 250VAC
Color : Black or Silver
Product Dimension: 57 x 430 x 375 mm (H x W x D)
Package Dimension: 642 x 594 x 254 mm (H x W x D)
Product Weight: 5.2kg
Package Weight: 7.5kg