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.
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NuPrime AMG PRA Preamplifier
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Product details
Description
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.
Specifications
Frequency Response: 10Hz to 200kHz; +-0 to -0.1dB
THD: 0.008 %
Input Impedance:
Balanced IN: 1M Ohm @ 10 Hz ~ 200 kHz. Rated input voltage 8V.
Line IN: 1M Ohm @ 10 Hz ~ 200K Hz. Rated input voltage 4V.
Rated Output Voltage: 2 V (LINE) / 4V (BAL) @ 100 Ohm
Volume level 92 is 0dB input = output
S/N: 95 dB
Loudness Compensation:
2.2 dB (125 Hz)
4.5 dB (100 Hz)
5.3 dB (75 Hz)
Gain: 10.10 dB (High) & 6.44 dB (Low); Voltage Gain : 3.2 (High) & 2.1 (Low)
Color: Grey
Product Dimension: 55 x 235 x 300 mm (H x W x D)
Product Weight: 3.5kg
Overview
Compact audiophile line stage preamplifier
Fully balanced design
1M Ohm input impedance
Harmonic richness similar to vacuum tube preamps
Single-ended RCA and balanced XLR inputs and outputs
User-selectable four-stage "Active Low Frequency and Harmonic Gain"
Ultra-wide bandwidth low noise JFET input
Latest generation NuPrime’s "Single-Ended, Non-Negative Feedback" Class A module and MUSES8920 Op-amp input amplification stage
Non-feedback low-frequency domain Frequency Harmonic Modulation circuit
Two-stage gain control
Invertible phase control
Isolated power circuitry: power circuitry comprising of a star topology power and ground layers is built on one board, while a separate board houses the preamplification circuitry
Front panel milled from a 15mm harden aerospace aluminum alloy using a four-axis CNC machine with a diamond cutter through a 48 steps process
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 Volume
Briefly press for 3 sec to On/Off standby mode
Brief press to Input Selector
Turn the knob to adjust Volume
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