| Weight | 14 kg |
|---|---|
| Dimensions | 375 × 430 × 57 mm |
| Color | Black, Silver |
The NuPrime Evolution STA offers a breakthrough in distortion reduction. We called that Only Distortion Cancellation (ODC) design, continued advancing the state-of-the-art Class-D for the past decade.
A typical feedback error correction design inverts the output signal for summation with the original input signal to derive the negative error signal, which adds to the next cycle of the input signal to form a more accurate output signal. Nuprime’s ODC Class-D design derives the error signal from MOSFET devices and the output filter circuit directly, significantly reducing the negative feedback signal, which resulted in a substantial reduction in distortion THD+N of 0.002% @1kHz(5W), and less than 0.005% THD+N at 1KHZ (2W-100W). This breakthrough improvement in Class-D design resulted in a natural and pure sound characteristic.
Notable Features
- NuPrime breakthrough Only Distortion Cancellation (ODC) Class D design.
- Preamp stage and Class D oscillation circuit utilizing high-end NJR MUSES8820 op-amp.
- 650KHz high-speed switching frequency allows greater resolution to be achieved.
- The 550W high-power ultra-thin toroidal transformer power supply has been enhanced to deliver cleaner and more stable power with lower noise floor. 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.
- The custom select iron core linear power supply has a dual routing for dual outputs, with dual wire per output, to function as two power supplies for dual-mono implementation.
- High quality copper PCB trace instead of usual cables are used to connect the power supply to the amplifier’s circuitry, maximizing power delivery.
- Hybrid Class-D technology that retains the merits of both Class-A and Class-D amplification.
- A stereo amplifier with dual mono implementation.
The Evolution STA sound characteristics can be described as:
- Wider and deeper soundstage with no loss of clarity at the greatest depth. With large scale orchestral recordings, you will be able to have a clear image of the last rows of percussion and wind, even the subtle pedal sounds! Such details are presented in a truthful manner without artificial enhancements.
- Faster dynamics with greater range
- Natural and pure due to ultra-low distortion
- Cleaner background that provides greater detail and nuances
- Class-A like warmth
Specifications:
- Power Output (RMS): 230W @ 8 Ohms , 310W @ 4 Ohms
- Power Output (peak): 270W @ 8 Ohms , 360W @ 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.
- EVO STA 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
NuPrime Evolution STA stereo power amplifier
– CHRISTIAAN PUNTER, hifi-advice.com
“Between the CH and the NuPrime, certain key aspects have certainly noticeably shifted, but on the surface of it, and in an absolute sense, there is not very much to indicate that we just switched from a 31 K amplifier to one costing only 5 K. Honestly, it was more like switching from one high-end amplifier to another, invoking differences catering more to taste than to absolute quality. For instance, the Big Swiss amp remains the King of resolution and refinement. But to offset this, the NuPrime actually overshadows the CH in a couple of areas.”
NuPrime Evolution Dac-2 and STA combination review by HiFi.NL
NuPrime unveils the Evolution DAC-2, a successor to its acclaimed Evolution DAC, marking a milestone in its top-tier lineup. Coupled with the Evolution STA power amp, it forms an impressive music duo. Boasting stellar sound, diverse inputs, and sleek design, the NuPrime Evolution DAC-2 secures a formidable market stance.
Customer Review: Evolution STA – Stellar amplifier and outstanding service
– Chad Olsen, summithifiusa.com
“As it turns out, I did not have to worry. With the Evolution STA in the system, there was no perceived loss of bass control. Indeed, there was the same control, but with a more detailed bass than the AMG STA’s. As cliche as it sounds, across the frequency spectrum, I was hearing things that I swear I had not heard before with the AMG STA’s. The Evolution STA was able to do all this while retaining the detailed yet smooth sound signature that I really like about Nuprime amplification. The Evolution STA represents the best class D implementation I have heard. This is a truly end game type amplifier for me.”
Nuprime Evolution STA, Evolution DAC, CDT-10
– Eugenio
“…I have never particularly loved class D, but this new Nuprime amplification is truly extraordinary and I must admit that compared to the Spectral of a few years the leap forward is remarkable from every point of view.”
NuPrime Audio Evolution STA Power Amplifier
– Dick Olsher, theabsolutesound.com
“…First up was the Fleetwood Sound De Ville loudspeaker, a fairly benign 8-ohm bass-reflex load. Several sonic characteristics became evident rather quickly. First was the exceedingly low noise floor. Backgrounds appeared to be eerily quiet, more so than with the average solid-state amp and, obviously, without the tube-rush noise that I’ve become accustomed to. Second, resolution of low-level detail was superb. In particular, violin vibrato was exquisitely resolved with the sort of timing precision I’ve only experienced from far more expensive amps. But what surprised me the most was the Evolution STA’s ability to flesh out a believable depth perspective. In fact, the soundstage was exceptionally transparent, wide, and deep, with believable image focus. So now I’m thinking to myself, can a Class D amp really dish out this sort of imaging? And then it got even better. Micro dynamics were served up with emotional expressiveness. Orchestral crescendos were unfurled with tremendous power and control. And bass lines were punchy and tightly defined. It began to occur to me that this amp was going to be difficult to criticize.
……
This scenario was much different than that presented by, say, a single-ended triode amp, whose distortion spectrum is rich in even harmonics and as a result dominates a system’s voicing. The NuPrime proved to be the total opposite. In this respect, it turned out to be a reference tool by
providing a truthful sonic snapshot of upstream components.
……
Next in line was the Innersound Isis 3.5 hybrid electrostatic loudspeaker. This load has proven to be problematic for some Class D amplifiers due to its capacitive impedance and 2-ohm minimum through the upper octaves. Again, there was nothing of significance to criticize. ……..As you would expect from an electrostatic midrange and treble, transients were supremely well controlled, while the bass range was reproduced with control and full extension.
Finally, it was time for the Analysis Audio Omega. This quintessential planar speaker, an Apogee look-alike, has been a staple in my reference system for many years. It’s a 4-ohm nominal load, though it dips to around 3 ohms and demands a lot of current. In this context the NuPrime was able to generate a panoramic soundstage and believable depth perspective. Its level of micro dynamic finesse, purity of tone, resolution of individual voices in a complex mix, and rhythmic drive kept me listening late into the night.
……
The NuPrime Evo STA caught me by surprise. I didn’t expect any amp at this price point, let alone a Class D amplifier, to be capable of such exquisite musicality. Mated with a compatible speaker load, it is deserving of an enthusiastic endorsement. It will not be leaving my system any time soon.”
