NuPrime Audio AMG PRA Pre Amplifier

$1,970.46

$1,642.06 Exc. VAT |

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Description
Specifications
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NuPrime Audio AMG PRA Pre Amplifier

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

Amplifier

Power: 150W @ 8 ohms; 200W @ 4 ohms (both channels driven)
THD:
- <0.02% (AUX IN, 1W, @ 8 & 4 ohms)
- <0.01% (OPT IN, 1W, @ 8 & 4 ohms)
Signal-to-Noise Ratio: >95 dB (Digital input, 10W out @ 8 ohms)
Clipping Power: >230W (1kHz @ 4 ohms, both channels driven)
Frequency Response: +0.6 dB/-1dB (12 Hz – 22 kHz)
Channel Separation: >85dB (1 kHz AUX); >105 dB (10 kHz Digital)
Input Sensitivity:
- 0.85V (AUX & OPT) for 100W @ 8 ohms
- 0.75V (AUX & OPT) for 100W @ 4 ohms
Standby Power: <0.5W

DAC & Wireless

Bit Depths: 16-32 bit
Streaming Audio Processing Engine: up to 192KHz / 24-bit
IIS/DSD HDMI Input: PCM up to 768KHz/32Bit and DSD up to DSD256
USB PCM/DSD Input: PCM up to 384kHz/32Bit and DSD up to DSD256
Optical S/PDIF Input: PCM up to 192KHz and supporting DoP format DSD64
Optical, Coaxial and analog Pre-Out
MQA*
Bluetooth: Two-Way (Receive and Headphone modes)
Network Connectivity: Gigabit Ethernet RJ45, 802.11 b/g/n Wi-Fi
Streaming Services: Amazon Music, Deezer, iHeartRadio, Qobuz, QQ Music, Spotify, TIDAL, TuneIn, Napster, Ximalaya

Dimension and Weight

Product Dimensions (W x H x D): 280 x 55 x 250 mm (includes feet and extended rear panel terminals)
Product Weight: 3 kg (6.6 lbs.)
Package Dimensions (W x H x D): 440 x 100 x 340 mm
Shipping Weight: 5 kg (11 lbs.)

MQA might be available at a later date through over-the-air firmware update.
Airplay 2 when available, would require additional hardware upgrade cost.

All specs are measured according to IHF 202 CEA 490-AR-2008 standard. THD is measured using AP AUX 0025 passive filter and AES 17 active filter.

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