Усилители мощности моно — Nuprime Audio Evolution Two-SE

The Evolution Two-SE is a true mono amplifier working in Class D from NuPrime Audio and is the single-channel model of the Evolution series, where it is listed at USD 4,199 each. It updates the earlier Evolution Two, built around a revised form of the NuPrime circuit called Only Distortion Cancellation, or ODC. The company states that the new ODC circuit handles interference ten times better, lowering total harmonic distortion.

Key specs that matter

NuPrime rates RMS output at 300 W into 8 ohm and 600 W into 4 ohm, with peak figures of 410 W and 820 W for the same loads. THD plus noise is 0.001% at 1 kHz and 5 W, and 0.002% at 1 kHz across the 2 W to 200 W range. Frequency response runs from 10 Hz to 50 kHz at -3 dB. Input impedance is 47 kOhm, output impedance is 2 milliohm, and an input of 2.1 V RMS reaches rated power. Gain is 26.44 dB, a voltage gain of 21. The low-profile case measures 57 mm high, 430 mm wide and 375 mm deep, with a weight of 10.5 kg, or 14 kg packed.

Engineering and use context

The output stage switches at 650 kHz. Power comes from a 900 W toroidal transformer, with 48,400 microfarads of total supply capacitance. NuPrime fits military-grade resistors with an ultra-low temperature coefficient of 15 ppm and uses LME49860 op-amps in the input stage and in the Class D oscillator, aiming at very low noise and distortion. Mains voltage is selectable between 115 V and 230 V, protected by a 7 A slow-blow fuse. Idle draw is 16 W at 115 V and 14 W at 230 V, and standby consumption is 1 W. A trigger input allows the amplifier to switch on together with a preamplifier or processor. The warranty runs for three years.

Pairing

A stereo system takes a pair of units. Connections include XLR and RCA inputs, and the input sensitivity suits preamplifiers and DACs with variable output. Within the same series, the Evolution DAC-2 combines a converter with dual ESS9038Q2M chips and nine digital inputs with a headphone amplifier and can feed the monoblocks directly, while the Evolution Stream Server can act as the network source. Owners who prefer one chassis can look at the Evolution STA-SE, a dual-mono stereo amplifier with a preamplifier section rated at 400 W per channel into both 8 and 4 ohm, while the Evolution Two-SE lets each channel sit close to its loudspeaker.

Alternatives

The NuPrime AMG One is a smaller monoblock that the company describes as a scaled-down Evolution Two, rated at 170 W into 8 ohm and 220 W into 4 ohm.