Power amplifiers stereo — Nuprime Audio STA-9X
Description, images, technical data and specifications
Nuprime Audio STA-9X
Image source — © Nuprime Audio
The STA-9 is a Class A+D stereo amplifier. In stereo mode, its power is 120 watts per channel, but it can also work in mono amplifier mode with a power of 290 watts. The amplifier circuit is borrowed from the IDA-8, which is based on a high-impedance class A pre-stage and a Class D power stage. Thanks to this, the novelty sounds "almost lamp-like", but at the same time it is clear and reliable. The 95 dB signal-to-noise ratio is achieved by JFET transistors simulating triodes.
Specifications
Model name
STA-9X
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
47 000
Input impedance (single-ended) (Ω)
47 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
0.02
Max current (A)
N/A
Output power (8Ω) (W)
170
Output power (4Ω) (W)
370
Gain (dBu)
x28.5
Frequency response low +/- 3dB (Hz)
10
Frequency response high +/- 3dB (Hz)
50 000
Signal to Noise Ratio (dB)
>90
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
0.005
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
55 x 235 x 281
Weight (kg)
4
Official link
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