NuPrime STA-9 Power Amplifier
Best power amplifier for audiophiles seeking tube warmth with modern efficiency.
Experience the NuPrime STA-9, a versatile 2 x 120W Class A+D stereo amplifier that can be bridged into a powerful 290W mono amplifier. It features enhanced even-order harmonic circuitry, mimicking the desirable sonic characteristics of tube amplifiers without their drawbacks. This design delivers a spacious, transparent, and dynamic soundstage with rich textures. The STA-9 utilizes an advanced Class-D power stage combined with a single-ended Class A preamp stage for exceptional speed and clarity. Its new linear power supply and high-efficiency toroidal transformer ensure reduced noise and improved low-frequency performance, offering an unparalleled audio experience.
$598.37
More STA Options
Owner Satisfaction
4.8
/ 5
Category Rank
168
/ 1684
#168 in Power Amplifiers
Price vs Category Average
-93%
Below average
Power Output
212012908
/ x W (Stereo) / x W (Mono) @ Ohms
Who it's for
- Listeners who prioritize transient speed and sonic transparency
- Space-conscious listeners needing high power without excessive heat
- Audiophiles planning future upgrades or driving power-hungry speakers
Who should skip it
- System builders requiring balanced XLR connections for long cable runs
- Listeners who prefer the rich warmth of traditional tube amplifiers
- Owners of high-output preamps sensitive to noise floor issues
Performance breakdown
Sonic Character
Class A warmth meets Class D precision for a tube-like experience.
Power Versatility
Bridgeable design offers flexible power scaling for demanding speaker setups.
Signal Purity
Capacitor-free signal path ensures minimal coloration and exceptional audio transparency.
Dynamic Range
High-efficiency toroidal transformer delivers punchy, controlled low-frequency performance.
Build Efficiency
Compact footprint saves rack space without sacrificing thermal or electrical performance.
Distortion Control
Ultra-low harmonic distortion provides a clean, fatigue-free listening experience.
Key Specs
Power Output
2 x 120W (Stereo) / 1 x 290W (Mono) @ 8 Ohms
Peak Output Power
2 x 280W / 1 x 320W @ 8 Ohms
Input Impedance
47k Ohms
Frequency Response
10Hz to 50kHz
Dimensions
235 mm W x 281 mm D x 55 mm H
Weight
10.5 lbs
Amplifier Class
Class A + Class D
Input Connectors
RCA (Unbalanced), XLR (Balanced)
Features
- Bridgeable for flexible stereo or mono operation
- Tube-like sound with Class D efficiency
- High output current for low impedance speakers
- Accurate signal reproduction with advanced switching frequency
- Capacitor-free signal path for pure sound
- Spacious soundstage and dynamic range
- Ultra-low distortion for clear audio
- Elegant, compact design
What customers say
Customers overwhelmingly praise the NuPrime STA-9 for delivering exceptional value and high-end performance. The core theme is its remarkable sound quality, attributed to the sophisticated Class A+D hybrid design. Listeners consistently report outstanding transparency, speed, and detail, noting a wide, well-defined soundstage that surpasses expectations for its price and size. Key sonic attributes include powerful, controlled bass and smooth, nonfatiguing treble. Users also appreciate the solid build and the versatility of its stereo or bridged monoblock operation. The consensus is that the STA-9 offers a neutral, highly engaging listening experience, making it a strongly recommended component for serious audio enthusiasts seeking premium sound without the premium cost.
Know before you buy
Yes, the STA-9 is bridgeable. You can switch it into mono mode to deliver a more powerful 290W output, which is ideal if you want to use two units for a monoblock setup.
The STA-9 uses enhanced even-order harmonic circuitry to replicate the warmth and rich textures associated with tube amplifiers. It provides that classic, musical character while maintaining the speed, efficiency, and clarity of a modern Class-D design.
Yes, the STA-9 is designed with high output current capabilities, allowing it to drive low-impedance speakers effectively. It is compatible with both 4-ohm and 8-ohm speaker loads.
No, the STA-9 is a dedicated power amplifier. It does not feature a built-in digital-to-analog converter, nor does it come with a remote control, as it is designed to be controlled via your preamplifier.
The unit features both RCA unbalanced and XLR balanced inputs. This gives you the flexibility to connect it to a wide range of preamplifiers or audio sources.
No, the STA-9 is not rack-mountable. Its compact, elegant chassis is designed for desktop or shelf placement, measuring 235mm wide and 55mm high.
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