About the NuPrime AMG PRA
The NuPrime AMG PRA is a fully balanced analog preamplifier with 1MΩ input impedance, a single-ended Class A JFET input stage and a MUSES72320 volume control. NuPrime designed it to be transparent with a distinctive character of its own: a user-selectable four-stage low frequency and harmonic gain control adds bass presence for smaller speakers. At HiFi Boutique it ships free anywhere in the USA, with sales tax already included.
Why Choose the AMG PRA
The AMG PRA isolates its audio signal from the power circuit. A star-topology power and ground board sits apart from the preamplifier board, separated by an isolation layer. NuPrime describes the result as a transparent sound that is natural and not over-etched.
The JFET input and MUSES8920 op-amps produce harmonics similar to tube amplifiers, which NuPrime describes as warm, airy and velvety. Rather than a simple bass boost, the loudness control uses a non-feedback low-frequency harmonic modulation circuit to extend bass with a natural roll-off and minimal phase distortion.
The AMG front panel is milled from 15mm hardened aerospace aluminum alloy on a four-axis CNC machine with a diamond cutter, in a 48-step process, with a 3D floating logo and diamond-cut edges.
Front Panel Controls
- Left toggle: high or low output gain
- Right toggle: normal or inverted phase
- Left knob: loudness compensation, off or levels 1 to 3
- Right knob: press for input selection, hold 3 seconds for standby, turn for volume
Details
Complete Specifications
Complete Specifications
| Output level | 2V line / 4V balanced |
|---|---|
| Frequency response | 10Hz – 200kHz (0 to -0.1dB) |
| THD+N | 0.008% |
| Gain settings |
|
| Dimensions (mm) | 55 x 235 x 300 mm (H x W x D) |
| Dimensions (in) | 2.2 x 9.3 x 11.8 in (H x W x D) |
NuPrime AMG PRA at a Glance
- Input impedance: 1MΩ on balanced and line inputs, 10Hz to 200kHz
- Input stage: ultra-wide-bandwidth low-noise JFET, single-ended Class A
- Volume: MUSES72320 highly linear volume control
- Op-amps: MUSES8920
- Design: fully balanced inputs and outputs
- Controls: four-stage loudness, high and low gain, phase invert
- Frequency response: 10Hz to 200kHz (0 to -0.1dB)
- Finish: grey
AMG PRA Specifications
| Specification | AMG PRA |
|---|---|
| Model | AMG PRA |
| Product Type | Fully balanced analog preamplifier |
| Input Impedance | 1MΩ, 10Hz – 200kHz (balanced and line) |
| Rated Input Voltage | 8V balanced; 4V line |
| Rated Output Voltage | 2V line; 4V balanced (@ 100Ω) |
| Frequency Response | 10Hz – 200kHz (0 to -0.1dB) |
| THD | 0.008% |
| S/N | 95dB |
| Gain | 10.10dB (high); 6.44dB (low) |
| Loudness Compensation | 2.2dB (125Hz); 4.5dB (100Hz); 5.3dB (75Hz) |
| Finish | Grey |
| Dimensions (H x W x D) | 55 x 235 x 300 mm (2.2 x 9.3 x 11.8 in) |
| Net Weight | 3.5 kg (7.7 lb) |
| Shipping Weight | 5 kg (11 lb) |
Connections & Compatibility
Connections & Compatibility
Who It's For and System Pairing
The AMG PRA is for a system with analog sources and a separate power amplifier. Its gain and phase settings help it match different amplifiers. Pair it with the NuPrime AMG STA-SE or a pair of AMG One mono amplifiers in the same chassis. Browse the full NuPrime collection to build out your system.
FAQ
FAQ
What does the loudness control do?
It adds bass presence in three stages (up to 5.3dB at 75Hz) with a natural roll-off. NuPrime notes it adds warmth and impact rather than volume.
Is the AMG PRA balanced?
Yes. Its inputs and outputs are fully balanced, with line outputs as well.
Why does 1MΩ input impedance matter?
A very high input impedance places almost no load on the source, so the source output is passed through with minimal interaction.
Can I invert phase?
Yes, with the right-hand toggle switch on the front panel.
What warranty does the NuPrime AMG PRA have?
NuPrime lists a 2-year manufacturer warranty for the AMG PRA.
Does HiFi Boutique charge shipping or sales tax on the AMG PRA?
No. The AMG PRA ships free anywhere in the USA, and sales tax is already included, so the price you see is what you pay.
What does the loudness control do?
It adds bass presence in three stages (up to 5.3dB at 75Hz) with a natural roll-off. NuPrime notes it adds warmth and impact rather than volume.
Is the AMG PRA balanced?
Yes. Its inputs and outputs are fully balanced, with line outputs as well.
Why does 1MΩ input impedance matter?
A very high input impedance places almost no load on the source, so the source output is passed through with minimal interaction.
Can I invert phase?
Yes, with the right-hand toggle switch on the front panel.
What warranty does the NuPrime AMG PRA have?
NuPrime lists a 2-year manufacturer warranty for the AMG PRA.
Does HiFi Boutique charge shipping or sales tax on the AMG PRA?
No. The AMG PRA ships free anywhere in the USA, and sales tax is already included, so the price you see is what you pay.
Shipping & Warranty
Shipping & Warranty
Warranty: 2-year NuPrime manufacturer warranty
Free shipping anywhere in the USA, with sales tax included in the price. No extra fees at checkout.
HiFi Boutique ships within the United States only. Orders ship within 2 business days, with a tracking number. See the shipping policy.