By Ed Selley, AVForums
The NuPrime STA-9 is a compact, Class D power amplifier designed for high-performance audio setups. It features a Class A biased JFET input stage, a 550kHz switching frequency to minimize unwanted noise, and a linear power supply for improved performance.
Pros:
✅ Rich, engaging sound with a spacious presentation
✅ 120W output, with an optional bridged mode for 290W
✅ Excellent build quality, premium connectors, and durable design
Cons:
❌ Might sound too warm for some preferences
❌ Lacks a 12V trigger for remote power control
Performance & Sound Quality
The STA-9 delivers a rich, warm, and detailed sound, offering impressive depth and three-dimensionality. It pairs well with various preamps and speakers, producing a valve-like tonal character. While not the most aggressive in dynamics, it excels in spaciousness and refinement.
Conclusion
The NuPrime STA-9 is a highly capable Class D amplifier that challenges the stereotype of digital amps. With its strong performance, premium build, and versatility, it earns a Highly Recommended rating.
Overall Score: 9/10
--> Link to full review: NuPrime STA9 Power Amplifier Review
