Ido Audio NuForce HeadphoneAmp, PreAmp, USB DAC DAC9

DAC9 thiết bị chuyển đổi âm thanh stereo số sang analog DAC USB, pre-amplifier , headphone Amplifier  ở mức độ tham chiếu đích thực ( true reference class).
Dễ dàng kết nối với các nguồn âm thanh như CD player , máy tính .. qua ngõ cắm tín hiệu USB , optical , coxial  , BNC , XLR.
Tín hiệu Digital :
+ S/PDIF - Coaxial hoặc 3,5mm optical ( lên tới 192kHz/24-bit )
+ USB DAC ( với USB 1.0 hoặc 1.1  ( lên tới 44.1kHz/16-bit ), với USB 2.0 ( lên tới 96kHz/24-bit ) )

Pre Amplifier cho hệ thống âm thanh hi end.

DAC 9 hỗ trợ cùng lúc 2 cổng cắm headphone  6,3mm và 3,5mm và chuẩn cắm  XLR (true-balanced) , RCA

Hỗ trợ tai nghe trở kháng lên đến 300Ohm

DAC9 headpone Amplifier , một sự kết hợp tuyệt vời với tai nghe đỉnh cao của Sennheiser, HD 800

Specifications

6 digital inputs (USB, XLR AES/EBU, RCA Coaxial or BNC, RCA Coaxial, Toslink, 3.5mm Optical*):
Transformer or optical isolated, AC coupled.
Maximum bit depth: 24 bit
Maximum S/PDIF sample rate: 192kHz
Maximum USB sample rate: 44.1, 48, 96 kHz
A small plugged-in USB module allows for future upgradeability to a higher-bit-rate USB interface card.
Coaxial or BNC S/PDIF input: Only one of these inputs can be used when Input 3 is selected. To achieve optimum performance, we recommend a 75-ohm BNC cable (available from NuForce) with a BNC connector.
On the front panel, a 3.5mm optical S/PDIF input.
Outputs: XLR, RCA, 3.5mm and 6.3mm headphone output*.
Output Impedance: RCA, 0.01 Ohm; XLR, 50 Ohm; Headphone, 10 Ohm
Output voltage 0dB, 1kHz:  RCA 2.0/4.0Vrms,  XLR 4.0/8.0Vrms  (Low output/High output versions, low output version has to be custom ordered)
Headphone power spec.:
288mW rms @ 30 Ohm
210mW rms @ 120 Ohm
152mW rms @ 300 Ohm
THD+N:  0.01, 0dB, 1kHz
SNR: 103dB, 1kHz, A-weighted
Frequency Response: 20-20kHz +/- 0.25dB
The true-balanced XLR output produces twice the gain of the RCA output. The remote and front panel controls allow for fixed and variable voltages.
Touch panel control
Remote control: volume, input select, dim, mute
Volume and sample rate display
Power consumption: 9W
AC voltage:  100V/110V/220V/230V
Dimension:  215mm (w) x 400mm (d) x 60mm (h)
Weight: 3.2Kg net, 4.5Kg shipped
* The headphone output and optical input share the 3.5mm connector.

Product Description
Digital Analog Converter DAC-9


Engineered to meet the needs of the most demanding audio purists while also providing the greatest degree of flexibility, the NuForce DAC-9 is a true reference-class digital-to-analog stereo converter, pre-amplifier and headphone amplifier in one supremely sophisticated package. As to versatility, with its six digital inputs, the DAC-9 offers compatibility with all existing digital formats.

And, in keeping with NuForce’s commitment to its customers, plug-in USB module/interfaces will always provide for upgradeability to higher bit rates, thereby securing the end-user’s investment as digital technology continues to advance.

The DAC-9 addresses the need for complexity on a foundation of remarkable simplicity. Minimal processing and the shortest possible signal paths set the DAC-9 apart. For example, when an input source is selected, a pair of high-performance DACs offer up to 24-bit/192kHz (24bit/96kHz for USB) conversion of digital audio data. Extensive testing and listening tell us that up-sampling and sample-rate conversion do more harm than good, as does negative feedback. Consequently, no form of sample-rate conversion is ever employed.

Summing the output of two DACs increases the signal-to-noise ratio to near-theoretical limits wherein every musical nuance stands out in brilliant contrast to a background of utter silence. As a further enhancement, an innovative Passive IV Digital Output Filter assures lifelike musical reproduction. The DAC-9’s passive circuit employs no negative feedback of any kind, thus providing a ripple-free response wherein high-frequency phase coherence is always maintained.

Beyond the DACs and digital filter, the converted signal passes on to the analog preamplifier stage, which also adheres minimalist design principles. Again, NuForce applies no negative feedback in order, among other good reasons, to avoid higher-order distortion artifacts that typically plague unnecessarily complicated designs. The quietest circuitry components and layouts, along with the shortest possible signal paths, likewise contribute to the DAC-9’s exemplary performance characteristics. As another pathway to a “straight-wire-with-gain” end, when the user selects Fixed-Mode Output, the digitally controlled, precision volume attenuator is bypassed via means of a precision mechanical relay.

As impressive as these refinements are, the DAC-9 would not be nearly so successful without the clean, stable energy a shunt-regulated linear power supply provides. With its multiple regulation stages, the power supply allows the DAC-9’s digital and analog circuits to operate to their fullest potential, with the lowest noise and distortion possible.

Nor has NuForce overlooked the needs of the dedicated headphone listener. The DAC-9 includes a fully independent, high-performance headphone stage with a dedicated volume control. The DAC-9’s 6.3mm and 3.5mm headphone jacks sidestep the inconvenience and potential distortion of external plug adaptors. The DAC-9’s exceptional value and versatility is exemplified by the unit’s remote control, which beyond its array of usual conveniences, operates other NuForce devices such as our P-9 Preamp and CDP-8 CD Player. Moreover, the DAC-9’s sleek touch panel and low-profile chassis make a visually attractive addition to the finest playback systems.

NuForce strives, as always, to achieve superior performance by means of the purest and therefore simplest of design concepts. We’re confident that you will find the NuForce DAC-9 Digital-to-Analog Converter, Preamp and Headphone Amp to be the ideal answer to your listening requirements. Price notwithstanding, few competing products can compare to the DAC-9’s sonic excellence, simple elegance, and of course convenience. When one then takes into account the exceptional value the DAC-9 represents, we’re sure you'll agree it's in a class of its own.