NuPrime AMG STA
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19 990 kr
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19 990 kr
Regular price
19 990 kr
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NuPrime AMG STA
Regular price
19 990 kr
Sale price
19 990 kr
Regular price
19 990 kr
Unit price
Product description
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Reviews
NuPrime AMG STA is a properly upgraded STA-9, we are moving into the performance of the 10 series but with a slightly different approach to reproduction and more options as the STA can be operated in both stereo and mono.
The AMG STA consists of several state-of-the-art innovations in amplifier design. The class-leading features include 1M Ohm input impedance, high instantaneous current for power delivery, 700 kHz switching frequency, and a Single-Ended Non-Negative Class A module combined with a Double Feedback Class D module for 300 W mono amplifier power.
The AMG series front panel embodies its spirit. It is milled from a 15 mm hardened aluminum alloy using a four-axis CNC machine with a diamond cutter through a 48-step process. Design elements such as the "floating" 3D logo, the curved surface around the front panel's power switch, and the diamond-cut edge give the AMG series' affordable features the elegance of truly expensive audio products.
The technology
"The AMG STA's circuit board is equipped with shielding to isolate external disturbances. The JFET device with 300 MHz bandwidth provides ultra-high input impedance and fast response across the entire bandwidth. The dynamics of the design and the single-ended class A circuit enhance the natural second harmonic."
This construction allows the most sensitive details in the audio signal to be transmitted through the chain. The transparency in sound reproduction is truly astonishing in this class, with a skill in creating a very detailed sound image.
AMG-STA uses the class A module "Single-Ended, Non-Negative Feedback" in combination with a new class D circuit with "Double feedback". The class D oscillation frequency has increased to 700 kHz, which is 1.4 times that of the STA-9.
Circuit
The power supply uses a 380W specially wound power transformer, which has 30% more peak power than a traditional transformer.
The AC input to the power transformer uses a high current welding cable to provide maximum power transfer.
"In addition, a high-frequency 3rd order AC current filter reduces external noise."
In 20A terminal block, the transformer connects to the motherboard, in parallel with two rectifiers with 10A peak current.
The main current path, which has a high-capacity current design, uses a low-impedance copper plate to maximize power delivery to the amplifier circuits.
How did AMG STA mono achieve better sound characteristics and more power than AMG STA stereo?
The standard method for bridging a stereo amplifier to mono uses a series of op-amps (OPA) to invert the input signals to one of the stereo amplifiers, thereby creating an opposite phase, which can then be combined to increase power. Conversely, the innovative bridging circuit of the AMG STA employs a design we call Single-Ended Direct-Inject Bridge Technology, where the mono mode, in addition to delivering more than double the power, sounds livelier and more dynamic.
Impressions of listening
"With improvements in all areas, the bar has been raised for what is possible to achieve with sound performance in a small format."
AMG STA has a completely unique flavor, so it is difficult to compare it with Evolution One, which has drawn some of its design from ST-10, or ST-10, which is in the same price range. AMG STA sounds soft and relaxing. Detail richness, resolution, dynamics, and speed are in the class of ST-10, but the sound is still completely different.
"In comparison to the Evolution One, they shared the characteristic of being easy to reproduce the details in the recording. However, the AMG STA does things differently. While the Evolution One has that inviting warmth, the AMG STA aims to entice the listener. Instead of glitter and glamour, which quickly draws you into the performance, the AMG STA has an attitude that slowly immerses you in the music."
"AMG STA's tonal characteristics tend to be full and rich, making instruments and vocals seem to have extra body, weight, and harmonic richness. It may not be the most accurate reproduction, but it makes jazz and vocal pieces very addictive. It can take away the raw edge in rock and electronic music."
"It's hard to describe the sound from the AMG STA in measurable attributes because the presentation differs quite a bit from the other series. You have to try it and hear for yourself."
Christiaan Punter, HFA (hifi-advice.com)
"AMG-PRA + AMG-STA form a beautiful combination, not only visually but also in terms of sound synergy; the preamplifier's robust and full sound perfectly complements the power amplifier's slightly narrower balance. The combined result is a musically always engaging sound that is solid and full, soft and refined yet still very detailed and transparent, with perfect tempo and fantastic dynamics. Honestly, for 3200 euros, I haven't heard a better amplifier, either integrated or separate. As amazing as the combination is, the AMG-STA power amplifier is truly the star of the show. On its own, it can perform at a level far beyond what one would expect from an amplifier in this price range. To be more precise: if the preamplifier is already performing at a level that defies its price tag, the power amplifier steals the show because it has the ability to perform at the same level as amplifiers that usually cost several times more than its modest price. I'm not joking!"
Combine the AMG-STA with a fantastic volume-controlled DAC and you have an almost unbeatable system. If there has ever been an easy decision between single and dual amplifiers, this is it. The pair simply elevates the performance in every audiophile parameter, without compromising the emotional engagement.
As should be clear by now, I am definitely impressed by the NuPrime power amplifiers. First, the ST-10 proved to be a keeper, then the ST-10 Monos showed that the concept could be taken further, then the AMG-STA demonstrated that class-D can be just as "analog" and as refined as the best linear power amplifiers, and now the pair of AMG-STA has raised the bar even higher. Although the ST10 and ST10 Monos still have their unique feel, the AMG-STA pair is from now on my personal reference when it comes to affordable power amplifiers with true high-end ambitions.
"Whether used as a single stereo model or as a double monopole, the AMG-HPA is an absolute HFA favorite."
Specifications:
- Stereo effect: 2 X 130W @ 8 Ohm & 2 X 200W @ 4 Ohm
- Monoeffekt: 300 W @ 8 ohm & 320 W @ 4 ohm
- Nominal / peak current: 10A / 15A
- Amplification: 26 (stereo) & 52 (mono)
- Signal/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
If you shop for more than €150, we will ship free of charge!
If ordered before 3pm on weekdays, we will ship the same day, provided the item is in stock. Normal delivery time is 1-5 working days, but in case of high order intake or ordering of certain products, delivery may take longer. Should any of the goods you ordered be out of stock, we will notify you as soon as possible.
We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 14 days of delivery. When exchanging or purchasing a new item in connection with a return, we offer the return shipping.
What does our stock status mean?
- In stock - Shipped immediately the same day if order is received before 3pm (weekdays)
- 3-8 days - Available in stock at supplier and ordered home immediately
- 4-12 days - Available in stock at supplier and ordered home immediately
We offer a guarantee of at least 2 years for all products, and some goods are covered by an extended guarantee of up to 5 years. This way you avoid costly insurances and can be safe as a customer. If there is a problem during the warranty period, please contact us, and we will solve it quickly and smoothly.
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