NuPrime Evolution STA Stereo Amplifier

Two Hundred and Thirty Watts That Get Quieter

The Evolution STA is NuPrime's full-size statement stereo amplifier, and the numbers are the least interesting thing about it. It makes 230 watts per channel into 8 ohms and 310 into 4, with peaks of 270 and 360.

What sets it apart is how quiet it gets as it works harder. Distortion measures 0.0025% at 5 watts, and signal-to-noise improves from 95dB at 5 watts to 110dB at 100. Most amplifiers go the other way.

It is a hybrid Class-D design in dual-mono configuration, so each channel has its own signal path rather than sharing one. At 430mm wide and 5.2kg it is full-size in footprint but not in weight.

Inside the Chassis

Frequency response runs 10Hz to 50kHz at −3dB, and gain is a straightforward 21 times. Input impedance is 47k ohms, so the amplifier sits behind a valve preamplifier as comfortably as a solid-state one.

The input connectors are Furutech FP900 RCA, which is the kind of part most manufacturers save for a flagship. In an amplifier the connector is the first thing every note passes through.

It measures 430mm wide, 375 deep and 57 high, and weighs 5.2kg, in black or silver. NuPrime covers the Evolution STA with a 3-year warranty, three times what it gives the STA-9 series.

Who Is This Amplifier Best For?

• You listen at real levels — 230 watts into 8 ohms and 310 into 4 handles the great majority of speakers, and distortion actually falls as the amplifier settles into its stride.
• You care about the noise floor — signal-to-noise climbs from 95dB at 5 watts to 110dB at 100, so the background gets quieter the harder the amplifier works, not louder.
• You want dual-mono without two boxes — each channel runs its own signal path in one chassis, so channel separation does not depend on a shared layout.
• You are buying for the long term — NuPrime backs the Evolution STA for 3 years, against 1 year on its STA-9 series, which tells you how the company rates it.
• You do not own a preamplifier yet — the Evolution STA is a power amplifier, with no volume control and no input switching. Pick a partner from our preamplifiers and the two make a system.

How Does It Connect to Your System?

Connect your preamplifier to the Furutech FP900 RCA inputs, and speakers to the binding posts. The 47k ohm input impedance means a valve preamplifier will drive it without strain.

Give it a normal shelf. It is full-width at 430mm but only 57mm high, so it stacks under or over other components without a special arrangement.

Pairs Well With

Here are some great companions:

• Preamplifier: Required, and the natural next decision — see our Preamplifiers.
• Speaker Cables: Carry the current properly — see our Speaker Cables.
• Interconnects: Balanced XLR is the better run from preamp to amp — see our Interconnect Cables.
• Audio Rack: Give the amplifier a proper shelf — see our Audio Racks.

Frequently Asked Questions

How much power does it make?

230 watts per channel into 8 ohms and 310 into 4 ohms, with peaks of 270 and 360 watts.

Why does the noise figure improve with power?

Signal-to-noise is quoted at three levels: 95dB at 5 watts, 105dB at 50 and 110dB at 100. The amplifier's noise floor stays put while the signal rises.

Is it fully dual-mono?

It is a hybrid Class-D design in dual-mono configuration, so each channel runs its own signal path within the one chassis.

What inputs does it have?

Furutech FP900 RCA input connectors, at 47k ohms input impedance, with a gain of 21 times.

How big is it?

430mm wide, 375mm deep and 57mm high, weighing 5.2kg, in black or silver.

What warranty does it carry?

NuPrime covers the Evolution STA with a 3-year warranty.

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Learn More

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