NuPrime AMG PRA Preamplifier (DEMO)
NuPrime AMG PRA Preamplifier (DEMO)
NuPrime AMG PRA Preamplifier (DEMO)
NuPrime AMG PRA Preamplifier (DEMO)
NuPrime AMG PRA Preamplifier (DEMO)
NuPrime

NuPrime AMG PRA Preamplifier (DEMO)

Regular price $1,950.00 Sale price $2,399.00 Unit price per
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.

The AMG series front panel embodies its spirit. It is milled from a 15mm harden aerospace aluminum alloy using a four-axis CNC machine with a diamond cutter through a 48 steps process. Design elements such as the 3D “floating” logo, the curved surface around the front panel switch, and diamond-cut edge bring the quality of ultra-high-end audio products to the affordable range of the AMG series.

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-PRE 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.

Technical Details

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.

MUSES72320 Digital Volume Control

ONE MEGA ultra-wide bandwidth low noise JFET, single-ended Class A input design and MUSES8920 Op-amp produce harmonics similar to vacuum tube amps, which has a “warm, airy and velvety” sound characteristic.

Non-feedback low-frequency domain Frequency Harmonic Modulation circuit provides minimum phase distortion and tone error.

Inputs and outputs are fully balanced design.

Front Panel Settings

Left Toggle Switch: Output Gain

  • Upwards : High Gain
  • Downwards : Low Gain

Right Toggle Switch: Output Phase

  • Upwards : Phase Invert
  • Downwards : Phase Normal

Left knob: Loudness Compensation

  • Turn the knob to switch between Loudness Compensation

Right Knob: Power and Input Selector and Volumes

  • Briefly press for 3 sec to On/Off standby mode
  • Brief press to Input Selector
  • Turn the knob to adjust volume
  • Frequency Response: 10Hz to 200kHz; +-0 to -0.1dB
  • THD: 0.008 %
  • Input Impedance:
    • Balanced IN: 1M Ohm @ 10 Hz ~ 200 kHz
    • Line IN: 1M Ohm @ 10 Hz ~ 200K Hz
  • Rated Output Voltage: 2 V (LINE) / 4V (BAL) @ 100 Ohm
  • Volume level 92 is 0dB input = output
  • 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)