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High Performance Pre-Amplifier with 1M Ohm Input Impedance

The AMG PRA went beyond being a transparent preamp with 1M Ohm input impedance and the best analog source inputs. A user-selectable 4 stage “Active Low Frequency and Harmonic Gain” control gave it distinctive characteristics to enhance the speaker performance, a world-first in preamp design.

SKU: NP-AMG-PRE Category:


The design goal for AMG PRA was to deliver a transparent sounding analog preamp with its distinctive characteristics. Several new design concepts were developed and used in the AMG PRA besides 1MΩ input impedance to achieve the best analog inputs.

Users of smallish speakers would often detect a distinct drop in bass response with some audio tracks. Instead of a simple “Bass Boost” function that lifts a targeted low-frequency band, a user-selectable 4 stage “Active Low Frequency and Harmonic Gain” control compensates for the lack of bass presence. It achieves some bass extension and a more natural roll-off.

Additional features such as the 2 stage gain control and invertible phase control increase the compatibility of the AMG PRA with other power amplifiers.

The ultra-wide bandwidth low noise JFET input feeds the latest generation of NuPrime’s “Single-Ended, Non-Negative Feedback” Class A module and MUSES8920 Op-amp input amplification stage. This circuitry produces harmonics similar to vacuum tube amps, which has an “airy and velvety” sound.

The layout of the AMG-PRA takes excellent care in isolating the sensitive audio signals from the power circuitry. The power circuitry comprising of a star topology power and ground layers is built on one board while a separate board houses the pre-amplification circuit. An isolation layer separates these two boards, which further minimizes interference. The effect is a highly transparent sound that is natural and not over etched.



  • 3 x Analog Stereo RCA
  • 1 x Analog Stereo XLR balanced



  • One pair of Stereo RCA out
  • One pair of Stereo XLR balanced out



  • Frequency Response: 10Hz to 200kHz; +-0 to -0.1dB
  • THD: 0.008 %
  • Input Impedance: 1M Ohm @ 10 Hz ~ 200 kHz
  • Rated Output Voltage: 2 V (SE) / 4V (BAL) @ 100 Ohm
  • S/N: 95 dB
  • Loudness Compensation:
    1. 2.2 dB (125 Hz)
    2. 4.5 dB (100 Hz)
    3. 5.3 dB (75 Hz)
  • Gain : 3.2 (High) / 2.1 (Low)


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