NuPrime STA-9
Best power amplifier for audiophiles seeking tube-like warmth with modern efficiency.
Experience near reference-class audio with the NuPrime STA-9 stereo power amplifier. This versatile 2-channel amplifier delivers 120 watts per channel into 8 or 4 ohms, or can be bridged for a powerful 290-watt mono output. It uniquely combines a Class A input circuit with a Class D output stage, enhanced with circuitry that mimics the desirable sonic traits of tube amplifiers without their drawbacks. Designed for high reliability and exceptional low-impedance speaker drive, the STA-9 offers a pure signal path and superior noise reduction thanks to its new linear power supply with a toroidal transformer.
$599.00
Owner Satisfaction
4.7
/ 5
Category Rank
421
/ 1684
#421 in Power Amplifiers
Price vs Category Average
-93%
Below average
Power Output (Stereo)
212084
/ x W at & Ohms
Who it's for
- Audiophiles seeking tube-like warmth with modern power efficiency
- Listeners needing flexible power for demanding speaker setups
- Space-conscious users wanting premium build quality in small rooms
Who should skip it
- Purists requiring balanced XLR connections for noise-free signal paths
- Listeners preferring the organic, soft character of pure Class A
- Owners with enclosed cabinets lacking proper airflow for heat dissipation
Performance breakdown
Sonic Character
Hybrid design successfully captures the warmth of tubes with modern precision.
Power Versatility
Bridgeable mono mode provides significant headroom for driving demanding speaker loads.
Signal Purity
Capacitor-free signal path ensures minimal coloration and high-fidelity audio reproduction.
Build Efficiency
Compact footprint houses a robust toroidal transformer without sacrificing thermal management.
Dynamic Drive
High current output maintains composure during complex, fast-paced musical passages.
System Integration
Balanced and unbalanced inputs offer flexible connectivity for most audiophile setups.
Key Specs
Power Output (Stereo)
2 x 120W at 8 & 4 Ohms
Power Output (Mono)
1 x 290W at 8 Ohms
Peak Output Power
2 x 280W / 1 x 320W at 8 Ohms
Input Impedance
47k Ohms
Gain
x 22
Signal to Noise Ratio
< -80dB
THD+N
0.02% (Stereo) / 0.01% (Mono)
Frequency Response
10Hz to 50kHz
Features
- Bridgeable for stereo or mono operation
- Class A input with Class D output
- Tube-like sonic characteristics
- High current drive for demanding speakers
- Capacitor-free signal path
- Enhanced protection circuitry
- Efficient toroidal power supply
- High-accuracy switching frequency
What customers say
The NuPrime STA-9 is highly regarded for its exceptional value and versatile performance. Users consistently praise the sophisticated sound signature delivered by its hybrid Class A/D technology, noting outstanding clarity and transparency without listener fatigue. The amplifier reveals fine musical details while maintaining a pleasing midrange warmth. A key feature is its flexibility; it excels as a stereo unit but can be easily bridged into a powerful monoblock configuration, significantly boosting its upgrade potential. Build quality is solid and compact. Overall, the STA-9 delivers high-end audio performance typically found in much costlier components, making it a strongly recommended choice for discerning listeners seeking premium sound quality.
Know before you buy
Yes, the STA-9 is bridgeable. When switched to mono mode, it delivers a powerful 290 watts into 8 ohms, which is ideal for driving more demanding speakers.
The STA-9 utilizes a Class A input stage combined with a Class D output to emulate the warmth and harmonic richness of tube amplification. It provides that classic, musical sound signature while maintaining the efficiency and control of a modern solid-state design.
Yes, the STA-9 is designed with high-current drive capabilities, allowing it to handle low-impedance speakers effectively. It maintains a consistent 120 watts per channel whether your speakers are rated at 4 or 8 ohms.
No, the STA-9 is a pure power amplifier and does not include a built-in DAC or remote control. You will need a separate preamplifier or a DAC with volume control to manage your signal source.
The amplifier features both RCA unbalanced and XLR balanced inputs. This allows for flexible connectivity with a wide range of preamplifiers and high-end audio components.
By removing capacitors from the signal path, the STA-9 reduces potential signal coloration and phase distortion. This results in a cleaner, more transparent sound that stays closer to the original recording.
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