NuPrime
NuPrime STA-9 Stereo Amplifier
Product Description
The NuPrime STA-9, a 2 X 120W Class A+D stereo amp, bridgeable into a 290W mono amp, is designed with enhanced even-order harmonic circuitry that mimics the most attractive features of tubed-amp sound without incurring tubes’ drawbacks and limitations. The STA-9’s spacious, transparent, dynamic and luxuriously textured soundstage has to be heard to believe.
The NuPrime amp circuit improves on traditional Class-D design by using a self-oscillating circuit to generate pulse-width modulation. The amplifier switches at a frequency of 550kHz, well beyond the compact disc’s 44.1kHz sampling rate. Most class-D amps switch at 300kHz or lower.
Completing the ensemble is NuPrime’s new linear power supply with its high-efficiency toroidal transformer for reduced high-frequency noise and strengthened low-frequency performance. The damping effect of the NuPrime isolation feet absorbs and cancels vibrations that degrade audio performance. The overall result is unprecedented transient speed and an almost shocking level of dynamic impact. The STA-9’s frequency response to 50 kHz elevates vocals into emotional experiences; similarly, instrumental upper registers mimic a live performance’s shimmering heights.
NuPrime’s sonic character stands well apart from – and indeed above – the soft, cushy sound often associated with most tubed amplification or the dry, clinically edgy sound of solid-state and switching technology. Rarely does an amp achieve an ideal balance of richly textured timbres and harmonics, bottom-end authority, startling dynamics, exquisite low-level detail, and a fully revealed, fully dimensional soundstage against a backdrop of mile-deep silence.
Product Details
- Measurements
2.17"L x 9.25"W x 3.20"H
- OriginTaiwan
— Warranty: Manufacturer's 1 Year
— Single End Class A + D Amplifier Design
— Bridgeable Allowing Switch Between Stereo Or Mono Mode
— Enhanced Even-order Harmonic (H2) Circuitry
— Highly Reliable Under No-load Condition & Enhanced Short Circuit Protection
— High Output Current Drive Capability For Low Impedance Speakers
— 550 KHz Switching Frequency For Accurate Reproduction Of Musical Signal
— Linear Power Supply With A High-efficiency Toroidal Transformer
— Reduced High-frequency Noise And Strengthened Low-frequency Performance
— Signal Path Avoids Cross-linking Capacitors, Achieving A Frequency Response At DC Level
Inputs:
— RCA: Un-Balanced
— XLR: Balanced input
Outputs:
— Stereo Speaker Out
— Mono Speaker Out
— Power: 2 X 120W / 1 X 290W @ 8 & 4 Ohms
— Peak Output Power: 2 X 280W / 1 X 320W @ 8 & 4 Ohms
— Input Impedance: 47k Ohms
— Input sensitivity: 232.8mV, 1W @ 8 Ohms; 1.4V to rated power
— Gain: x 22
— Signal to Noise Ratio: < -95dB at 1W, 10W, 100W
— THD+N: 0.02% (Stereo) / 0.01% (Mono)
— Frequency Response: 10Hz to 50kHz
— Worldwide AC voltage: (115 VAC / 230 VAC) with Voltage Select Switch
— AC Fuse: Slow-blow, 3A, 250VAC
Shipping Information
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Shipping AvailabilityCanada, United States
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Shipping PolicyStandard Ground Shipping
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Ship In3-4 weeks ⓘ
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Return PolicyFinal sale, not eligible for return or cancellation
Size Chart
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