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NuPrime STA-9

NuPrime STA-9
NuPrime STA-9
NuPrime STA-9
NuPrime STA-9
NuPrime STA-9
NuPrime STA-9


Class A+D Stereo Amp bridgeable into a 290W mono amp

The NuPrime STA-9, a 2 X 120W Class A+D stereo amp, bridgeable into a 290W mono amp, is designed with enhanced even-order harmonic circuitry that mimics the most attractive features of tubed-amp sound without incurring tubes’ drawbacks and limitations. The STA-9’s spacious, transparent, dynamic and luxuriously textured soundstage has to be heard to believe.

The STA-9 amplifier is derived from the ULCAM (Ultra Linear Class A Module)+Class D design first introduced in the IDA-8. By joining a powerful high impedance singled ended amplifier circuit in the preamp stage with a well integrated Class-D power stage, the STA-9 delivers a rich tube-like sound with the remarkable speed and clarity of NuPrime Class-D design. Audio enthusiasts are bound to be impressed.

The NuPrime amp circuit improves on traditional Class-D design by using a self-oscillating circuit to generate pulse-width modulation. The amplifier switches at a frequency of 550kHz, well beyond the compact disc’s 44.1kHz sampling rate. Most class-D amps switch at 300kHz or lower. Completing the ensemble is NuPrime’s new linear power supply with its high-efficiency toroidal transformer for reduced high-frequency noise and strengthened low-frequency performance. The damping effect of the NuPrime isolation feet (patent pending) absorbs and cancels vibrations that degrade audio performance. The overall result is unprecedented transient speed and an almost shocking level of dynamic impact.The STA-9’s frequency response to 50 kHz elevates vocals into emotional experiences; similarly, instrumental upper registers mimic a live performance’s shimmering heights.

Features:
Single End Class A + D amplifier design
Bridgeable allowing switch between stereo or mono mode.
Enhanced even-order harmonic (H2) circuitry resembling the most attractive features of tubed-amp sound without its drawbacks and limitations.
Highly reliable under no-load condition and enhanced short circuit protection.
High output current drive capability for low impedance speakers.
550 KHz switching frequency for accurate reproduction of musical signal.
New linear power supply with a high-efficiency toroidal transformer. Reduced high-frequency noise and strengthened low-frequency performance.
Signal path avoids cross-linking capacitors, thus achieving a frequency response at DC level for pure musical enjoyment.

How did STA-9 achieve tubed-amp sound?
The front-end circuit of the STA-9 employs the same structure as that of the HPA-9: a single-end JFET structure that mainly simulates the sound characteristics of a triode by the addition of 2nd harmonics. The 2nd harmonic of a vacuum tube and STA-9 are high, resulting in an SNR measured value > 90DB. This does not mean that the STA-9 produces audible noise; rather, it is the effect of 2nd harmonic’s appealing coloration. The bandwidth of the front-end circuits of the STA-9 and HPA-9 are up to 300KHZ, which produce a more natural sound. With very low negative feedback, the sound is smooth and relaxed rather than harsh.

How did STA-9 mono achieve better sonic characteristic, in addition to more power than STA-9 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 STA-9’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.

The NuPrime Sound
Vast soundstage
Wide, lightning-fast dynamics
Ultra-low distortion and noise
Music emerges from a pristine background, with delicate details and nuances intact

In summary, NuPrime’s sonic character stands well apart from – and indeed above – the soft, cushy sound we often associate with most tubed amplification or the dry, clinically edgy sound we often associate with solid-state and switching technology. Rarely does an amp achieve an ideal balance of richly textured timbres and harmonics, bottom-end authority, startling dynamics, exquisite low-level detail, and a fully revealed, fully dimensional soundstage against a backdrop of mile-deep silence.

Inputs:
  • RCA: Un-Balanced input x 1
  • XLR: Balanced input x 1

Outputs:
  • Stereo Speaker Out x 1 or
  • Mono Speaker Out x 1

  • Power: 2 X 120W / 1 X  290W @ 8 & 4 Ohms
  • Peak Output Power: 2 X 280W / 1 X 320W @ 8 & 4 Ohms
  • Input Impedance: 47k Ohms
  • Input sensitivity: 232.8mV, 1W @ 8 Ohms; 1.4V to rated power
  • Gain: x 22 (x 42 for mono)
  • Signal to Noise Ratio: < -95dB at 1W, 10W, 100W
  • Dynamic range: -115dB to 0dB at 1kHz
  • THD+N: 0.02% (Stereo) / 0.01% (Mono)
  • Frequency Response: 10Hz to 50kHz
  • Worldwide AC voltage: (115 VAC / 230 VAC) with Voltage Select Switch
  • AC Fuse: Slow-blow, 3A, 250VAC
  • Dimension:  235 mm W x 281 mm D x 55 mm H (including feet)
  • Weight: 4.75 kg
  • Color: Black or Silver
  • In a 230V outlet, the idle-power consumption is below 16W.

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Buy&Try applies to the entire Aune, Auralic, Quadral, Sbooster & Taga range.

Buy & try gives you as a customer the opportunity to try out the product in your own home environment, instead of standing in a stressful store and trying to form an opinion. Rooms behave very differently and affect the sound in different ways and we give you the opportunity to demo the product for a full 30 days, in your own home.

 

If for some reason you feel dissatisfied, just contact us and we will help you with the return shipping, you can also take advantage of our shipping agreements with lower prices. Costs that will be charged to the customer are the shipping to the customer and the return shipping to us at MYC HiFi. For return approval, the item must be returned in new condition and in the original packaging.

 

Regarding speakers, be aware that speakers may need a long recording time to come into their own. After a couple of hours you can usually get a taste of what to expect, but a speaker deserves 100h+ before serious listening. The speakers we sell with ribbon tweeters need several hundred hours before they start to sing. So feel free to leave the speakers on around the clock so you can quickly accumulate hours.

 

If you have any questions or concerns, do not hesitate to contact us.

 

 

  • Buy & Try applies to goods that are normally kept in stock and not to order goods, unless otherwise agreed.

We provide at least a 2-year warranty on all products, some products have up to a 5-year warranty. With this, you avoid expensive insurances and can feel safe as a customer. In case of problems during the warranty period, contact us and we will solve it quickly and smoothly.


Aune: 2 years

Denon: 2 years

Marantz: 2 years

NuPrime: 2 years

Sbooster: 2 years

Taga Harmony: Passive speakers 5 years

Take Harmony Electronics: 2 years

Take Harmony Cables: 5 years

Quadral: Passive speakers 5 years

Xindak: Cables 5 years


Other products see the manufacturer's warranty.


ATTENTION!

The 2-year warranty does not apply to headphones, demo/service copies or consumables, in these cases the manufacturer's warranty applies. On demo and service copies, the warranty period is stated on the product page.

Lamp warranty

If the lamp for your projector breaks during the first 12 months, or the first 1000 hours (whichever comes first), you will receive a new lamp free of charge. If the manufacturer has a more generous warranty, it applies.

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