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High Performance Power Amplifier with 1M Ohm Input Impedance

The AMG STA comprises of several state-of-the-art innovations in power amp design. Its class-leading features include 1M Ohm input impedance, high instantaneous current for power delivery, 700kHz switching frequency, and Single-Ended Non-Negative Class A module coupled with Double Feedback Class D module for 300W mono amp power.

SKU: NP-AMG-STA Category:


The NuPrime AMG STA inherits the DNA of the Evolution One and delivers much of that superlative performance in a smaller form factor. The technological innovation of the 1MΩ input impedance design has trickled down to the AMG STA. Hence, the pre-amp is able to feed the it with the most delicate details in the audio signal. The level of transparency in sound reproduction is genuinely astonishing in this class of equipment, with a deft in creating a highly detailed sonic imagery.

Besides realizing the wide bandwidth 1MΩ input impedance with an ultra-wide bandwidth low noise JFET input, the AMG-STA uses another advancement NuPrime’s A+D amplifier topology. The “Single-Ended, Non-Negative Feedback” Class-A module partners with a new “Double feedback” Class D circuitry. The Class D oscillating frequency has increased to 700kHz, which is 1.4 times that of the STA-9.

The importance of power delivery was one of the critical design philosophies in developing the Evolution series. Hence, similar attention was given to the AMG-STA power supply. The main current path, adopting a large-capacity current design, uses a low-impedance copper plate to maximize power delivery to the amplifier circuits. The power supply also employs a 16A Dual-Bridge rectifier circuit, which delivers three times the instantaneous current compared to the STA-9.

With improvements to every area, the bar is raised for what is achievable with audio performance in small form factor. High-frequency extension and Low-frequency dynamic speed are much improved from the STA-9. You will be able to hear strong hints of the Evolution sound, such as the rich, natural details, and the smooth, inviting sound.



  • Stereo Power: 2 X 130W @ 8 Ohm & 2 X 200W @ 4 Ohm
  • Mono Power: 300W @ 8 Ohm & 320W  @ 4 Ohm
  • Gain : 26 (stereo) & 52 (mono)
  • Signal to Noise Ratio : 100 dB @ 10W
  • THD+N : 0.006
  • Frequency Response : 10Hz~50K Hz +-0.2dB @ 8 Ohm.  58K Hz @ -3dB
  • Input Impedance: 1M Ohm
  • Sensitivity: 1.2 Vrms @ Stereo; 0.95 Vrms @ Mono


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