Description
You are looking at a pre-owned NJC Audio Reference Series 24bit Upsampling DAC. The DAC is only 17 months old. The NJC Audio DAC is in excellent condition. On very close inspection you may notice a few tiny imperfections, but nothing of any significance. Ships worldwide in original box with user-manual and mains adaptor. Worldwide shipping Reference Series 24bit Upsampling DAC How a DAC can help to improve your system... The analogue output of modern production CD players can often be built using very basic low cost designs combined with low grade components, sound quality can often be second place. Using an external DAC bypasses the analogue stage turning the player into a CD transport, with the external DAC being a far higher quality source. The Reference DAC features a low noise seven stage linear power supply system, ensuring each key stage is independently powered from the next, PCBs are designed with completely separate digital & analogue sections which further improves performance, all combined with a low distortion, low noise output stage & many other refinements for a true reference grade sound quality.Multiple digital inputs to connect to any digital device...The rear of the DAC features a good selection of digital connections, there is an optical input, a coaxial input & a USB input. The S/PDIF coaxial digital input on the DAC is also transformer coupled so that ground loops are no longer an issue, this can also be switched between transformer coupled or a direct ground via the ground select switch on the rear of the DAC. High quality upsampling process with low jitter... All digital inputs are upsampled to 24bit 192kHz via an independently powered upsampling circuit using a very low jitter (<1ps) high quality master clock, regardless of whether the input is 16bit 44.1kHz or 24bit 96kHz or higher, the jitter reduction stages effectively remove any jitter present to below audible levels. This applies to all digital inputs (including USB) ensuring optimum & uniform sound quality regardless of which input is used. Digital Input Selector... The DAC has a front mounted input selector, this allows a very convenient way of changing from one input to another. Switching digital inputs can be performed with the DAC powered on, there will be no audible pops or clicks when switching. The switch used is also of high quality, using silver contacts for excellent electrical conductivity & longevity. Other features... A digital filter switch at the rear allows you to change the DACs filter response, there is also an attenuate switch & a S/PDIF ground select switch, along with an analogue input for extra convenience when connecting equipment.Modular design with quality components throughout...The design of the DAC is completely modular based which means that the DAC can easily be updated in the future (if required). At this moment in time the DAC makes use of the top of the range Cirrus WM8741 D/A converter (formerly Wolfson), if however in the future a newer chip were to be released we could then design a new module so that all existing DACs can be easily & very cost effectively updated, rather than having to purchase an entirely new DAC altogether. However, customer feedback with the WM8741 has been so positive with several owners over the years having compared the DAC to various high end DACs using the latest chipsets only to come back to us saying how they are finding the WM8741 to be something rather special. The DAC is only as good as the rest of its components so we only use the very finest components ensuring long term reliability, the seven stage linear power supply uses a multi stage regulation circuit ensuring no power sharing between each of the digital & analogue sections. Panasonic FM series capacitors are used for their ultra low impedance performance along with quality SMT film capacitors & thin film resistors for improved linearity in the analogue domain. A perfectly matched source for our Reference Series Headphone Amplifier... The DAC provides a perfect source when used with our Reference Series headphone amplifier for an extremely high quality headphone set up. When used with a reference grade headphone & suitable CD transport or computer based system, the combination provides an extremely entertaining & pleasurable listening experience, something that is often very hard to convey in words on a web-site, the best way to describe the sound is extremely refined, capturing every detail & nuance in the music, while providing a very balanced sound with no emphasis on any part of the frequency spectrum, being something that is not only enjoyable to use every day, but is also highly addictive to listen to music with long term. Technical Specifications... Digital & Analogue Inputs: Optical / Coaxial / USB / RCA analogue Bit Rates Supported: 16 & 24bit Sampling Rates Supported: 32kHz / 44.1kHz / 48kHz* / 88.2kHz / 96kHz / 192kHz *Native sampling rates above 48kHz are supported via the optical & coaxial inputsAsynchronous Upsampling: All digital inputs (inc USB) are upsampled to 24bit 192kHz Frequency Response: 10Hz - >30kHz +/- 0.1dB Total Harmonic Distortion: (BW=22kHz, *BW=80kHz, unweighted) 0.004% (1kHz) / 0.005% (10kHz) / 0.007% (20kHz*) Stereo Crosstalk: -115dBu (1kHz) / -100dBu (10kHz) / -98dBu (20kHz) Analogue Output Level: 1.7Vrms Warranty: 3 Years from date of purchase Dimensions/Weight: 210mm x 115mm x 70mm / 1.5Kg (inc transformer)Items Supplied: Reference DAC, external mains transformer, instruction booklet. Shipping U.K.: Shipping will be by DPD (next working day service) Non U.K.: Shipping will be via eBays Global Shipping Programme All shipping services fully tracked and insured The NJC Audio DAC operates on 15 VAC (15 Volts AC). The mains adaptor is a U.K. one, but if you live outside the U.K. you just need to buy an equivalent mains adaptor from where you live which will output 15VAC, 1 Amp. Thanks for looking. Any questions, please ask.
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