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NuPrime hemsida: nuprimeaudio.com
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AMG och PRA testad i Hifi&Musik 11/21
The AMG STA comprises of several state-of-the-art innovations in power amp design. Its class-leading features include 1M Ohm input impedance, high instantaneous current for power delivery, 700kHz switching frequency, and Single-Ended Non-Negative Class A module coupled with Double Feedback Class D module for 300W mono amp power.
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.
How did AMG STA mono achieve better sonic characteristic, in addition to more power than AMG STA stereo ?
The standard method for bridging a stereo amp into mono employs a series of op amps (OPA) in order to invert the input signals to one of the stereo amp, thereby creating an opposite phase, which can then be combined to increase power. Conversely, the AMG STA’s innovative bridging circuit utilises a design we call Single-Ended Direct-Inject Bridge Technology, in which the mono mode, in addition to acquiring more than double the power, sounds livelier and more dynamic.
Listening Impression
With improvements to every area, the bar has been raised for what is achievable with audio performance in small form factor.
The AMG STA has a flavor of its own, so it is hard to compare it with the Evolution One, which derives some of its design from or the similarly priced ST-10. AMG STA sounded smooth and relaxing. Detail, resolution, dynamics, and speed are in the ST-10 ballpark, yet the sound is quite different.
Drawing comparison with the Evolution One, they shared a trait of ease in reproducing the details of the recording comes afore. However, AMG STA does things differently. While the Evolution One has that inviting warmth, the AMG STA wants to allure the listener. Hence, instead of glitz and glamor, which pulls you in quickly into the performance, the AMG STA has a demeanor that slowly brings you into the music.
Tonal qualities of the AMG STA leans toward being full and rich, so instruments and vocals seem to gain extra body, weight, and harmonic richness. It may not be the most accurate reproduction but does make Jazz and Vocal pieces highly addictive. It may take away the raw edge of Rock and Electronic music and sounds less exciting for some.
The sound stage has an attractive characteristic. A linear presentation is like having floodlights shining on all the performers such that everyone can be seen equally well. The AMG STA, however, has more of a spotlighting effect, where performers are focused on getting your attention.
It is tough to put the sound of the AMG STA into measurable attributes as the presentation is quite different from the other series. You’ll need to try it and hear for yourself.
- Stereo Power: 2 X 130W @ 8 Ohm & 2 X 200W @ 4 Ohm
- Mono Power: 300W @ 8 Ohm & 320W @ 4 Ohm
- Rated / Peak Current: 10A / 15A
- Gain : 26 (stereo) & 52 (mono)
- Signal to Noise Ratio : 100 dB @ 10W
- THD+N : 0.006
- Frequency Response : 10Hz~50K Hz +-0.2dB @ 8 Ohm. 58K Hz @ -3dB
- Input Impedance: 1M Ohm
- Sensitivity: 1.2 Vrms @ Stereo; 0.95 Vrms @ Mono
Front Panel Power Switch
Power On: Up position
Power Off: Down position
If using the optional remote control, this switch should be in the Down position
Remote Control Code
CUSTOM CODE 0X06
— KEY CODE—
POWER ON / OFF 0X0
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-300x300w.jpeg "Demo - NuPrime Omnia S1")
