NuPrime Evolution STA Stereo Amplifier

Pure and Natural Sounding Power Amp with Class A-like Warmth

Rivaling the renowned NuPrime Evolution One in sound quality, the Evolution STA stereo amplifier with a dual mono configuration offers a breakthrough in distortion reduction, thanks to NuPrime's exclusive 'Only Distortion Cancellation' (ODC) technology. NuPrime has been advancing Class-D amp performance over the last decade, and the innovative ODC approach takes its amplifiers to the highest level of achievement.

The Evolution STA gives your music a wide and deep soundstage with no loss of clarity at the greatest depth. The natural and pure presentation is distinguished by a clean background and Class A-like warmth. The STA offers substantial muscle for hi-fi or home theater, providing rated RMS power of 230 watts at 8 ohms and 310 watts at 4 ohms. Peak power output is 270 watts at 8 ohms and 360 watts at 4 ohms.

Bringing your favorite music to life, NuPrime's hybrid Class D technology retains the merits of both Class A and Class D amplification, for warmth, speed, and power. The high-speed 650 kHz switching frequency allows exceptional resolution to be achieved.

No-Compromise Power Supply

The power supply can make or break a power amplifier. NuPrime went all the way with the Evolution STA to support uncompromising sound quality. The custom designed 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 the usual cables connect the power supply to the amplifier’s circuitry, maximizing power delivery.

The 550W high-power ultra-thin toroidal transformer power supply has been enhanced to deliver clean and extremely stable power with a very low noise floor. The entire power path fully supports 40A ultra-high current and low resistance terminals with dynamic current capability. The power supply filter capacitors are rated at total of 52,000uF.

Only Distortion Cancellation (ODC) Design

Delving deep under the hood, here is a quick summary of NuPrime's breakthrough Only Distortion Cancellation (ODC) Design. 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 has a significant advantage. It derives the error signal from MOSFET devices and the output filter circuit directly, significantly reducing the negative feedback signal. This results in a substantial reduction in distortion, with THD+N of 0.002% at 1 kHz (5W) and less than 0.005% THD+N at 1 kHz (2W-100W). This breakthrough improvement in Class-D design results in a pure and natural audio experience.

Product Features

Dual mono design stereo power amplifier
Hybrid Class-D technology retains the merits of both Class-A and Class-D amplification.
NuPrime breakthrough Only Distortion Cancellation (ODC) Class D design
650KHz high-speed switching frequency allows greater resolution to be achieved
Balanced XLR and unbalanced RCA inputs
550W high-power toroidal transformer power supply, enhanced to deliver exceptionally clean and stable power with an ultra-low noise floor
The entire power path fully adopts 40A ultra-high current and low resistance terminals
Total of 52000uF power supply filter capacitors
High-quality copper PCB trace instead of usual cables are used to connect the power supply to the amplifier’s circuitry, maximizing power delivery
One balanced XLR input
One unbalanced RCA input
Furutech FP900 RCA input connectors
Eichmann speaker binding posts
Trigger IN and OUT

Product Specs

Power Output (RMS): 230W @ 8 Ohms, 310W @ 4 Ohms
Power Output (peak): 270W @ 8 Ohms, 360W @ 4 Ohms
Gain: x 21
Sensitivity (to rated power): 2Vrms
Input Impedance: 47K Ohms
THD / S/N (typical) : @5W (0.0025% ,95db) , @50W (0.007% , 105db) , @100W (0.01% , 110db)
Frequency Response: 10Hz to 50kHz (-3dB)
Standby Power: 1.5W @ 115V outlet, 1.7W @ 230V outlet
Idle Power: 24W @ 115V outlet, 26W @ 230V outlet
AC Fuse: Slow blow, 7A , 250VAC
Dimensions: 17" x 14.6" x 2.6"
Weight: 23 lb.

Product Warranty

1 Year

Parts & Labor

NuPrime Warranty Information

Product Manual

	NuPrime Evolution STA Manual (PDF Format)

"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."

- Dick Olsher, The Absolute Sound, September 13, 2022

Audio Advisor occasionally has fantastic deals on clearance items that are in excellent condition and we happen to have just one or two of.

Demo: Photo samples, gear we auditioned, items returned for wrong color/wrong size, etc.

Open Box: Contents briefly examined or inspected for promotional or internal purposes

Factory Refreshed: Original-condition items repackaged by the manufacturer

Cosmetically Blemished: A few dings or scratches, but functionally in original condition

Used: May show some signs of use

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NOTE:
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