Nu Prime AMG STA

Description

Nu Prime AMG STA : Stereo Power Amplifier

The NuPrime AMG STA power amplifier comprises of several state-of-the-art innovations in power amplifier 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 which can be configured for stereo or mono use.

Details:

The AMG series front panel embodies its spirit. It is milled from a 15mm harden aerospace aluminium 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.

Technology

AMG STA PCB integrates ground wire shielding to isolate external interference. The 300 Mhz bandwidth JFET provides ultra-high input impedance and wide-band fast response. The dynamics of the design and the single-ended Class A circuit enriches the natural second harmonic.

This design allows the most delicate details in the audio signal to carry through the chain. The level of transparency in sound reproduction is genuinely astonishing in this class of equipment, with a deft in creating a highly detailed sonic imagery.

The AMG-STA uses the “Single-Ended, Non-Negative Feedback” Class-A module partners with a new “Double feedback” Class D circuitry. The Class D oscillating frequency has increased to 700kHz, which is 1.4 times that of the STA-9.

Power Circuit

The power supply uses a 380W special winding power transformer, which has 30% more peak power output of a similar volume transformer.

The AC power input from the Inlet Connector to the power transformer utilizes a high current welding line to provide maximum power transmission.

Besides, high-frequency 3rd-order AC power filter reduces external noise.

A 20A lock wire terminal block connects the transformer to the motherboard, in parallel with two10A peak current rectifiers.

The main current path, adopting a large-capacity current design, uses a low-impedance copper plate to maximize power delivery to the amplifier circuits.

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.

Specifications :