![]() ![]() It also features a valve rectified power supply (the standard DAC2.1x uses solid state rectification). The DAC2.1x Signature also features an abundance of upgraded components in comparison with the standard edition, including our own Audio Note (UK) Tantalum resistors and Copper coil capacitors used in key areas. The filter-interface coils / transformers are of extremely high quality, and are custom designed and manufactured in house by us. It uses the highest grade Analogue Devices AD1865, 18Bit stereo converter chip solely because we found it to be the best sounding available (yes, even better than the 20Bit versions!). Having removed all of the digital filtering that is required for over sampling, all filtering is done in the analogue domain where it is easier to retain good, wide band phase-frequency and dynamically coherent behaviour. In other words, the Audio Note (UK) DAC2.1x has no over sampling, no jitter reduction, no noise shaping and no re-clocking. The DAC1.1x/II Signature also features an abundance of upgraded components in comparison with the standard edition, including our own Audio Note (UK) Tantalum resistors in key areas. In other words, the Audio Note (UK) DAC1.1x has no over sampling, no jitter reduction, no noise shaping and no re-clocking. All we do is to reformat the data stream to allow the converter chip to be able to interpolate the incoming information correctly. 670611, licence to use this patent is available to both individuals and companies.As a result, we have developed a way of excluding or bypassing all these corrective measures, to allow the conversion from digital to analogue to be done without any manipulation whatsoever. * Patented Audio Note™ in-house designed and matched I/V interface transformers to get better dynamic interface, * High quality, low noise Beyschlag 1 watt resistors * Valve output stage with no feedback 6DJ8 anode follower with 1,500 Ohm output impedance * Exclusive 1xoversampling™ direct from disc™ digital circuit It originally cost £1,200 and has had several hundred pounds of new components added to lift its performance by a huge margin.Īudio Note™ Quality Level Two performance The unit is in excellent condition and has been little used in its three and a half years of life. The spec below gives the standard Audio Note spec. The DAC works very well with both valve and transistor amplifiers. For an additional cost to the auction price I can provide an Arcam Alpha 5 as transport and fit an LC Audio X03 clock upgrade. Synch mode allows an astonishing increase in sound quality but requires a transport using the same clock speed as the DAC ie 11mghz. In synched mode the DAC was judged the best-sounding DAC when publicly exhibited to a group of audio enthusiasts last March. In standard mode, the DAC offers a tireless, highly musical and very analogue sound. By fitting an LC Audio Clock to the DAC and synching the clock signal back to a suitable transport. As a standard DAC of the highest quality with a tireless sound due to its non oversampling nature and valve output stage. There are two ways you can use this DAC: 1. You can see additional polyprops on the main anologue circuit board. The digital psu Black Gate FKs are towards the back middle of the picture. The picture below shows the massive Solen main psu caps to the left while in the near left you can just about make out the choke and additional filter caps. Additional Auricap and silver mica caps used in the psu filtering chain.All electrolytic capacitors apart from the Black Gates replaced with Solen or equivalent polypropylene capacitors.The much revered Black gate capacitors in all critical locations including the digital power supply and cathode bypass positions.This particular dac started out in life as a standard 2.1x nos dac but has been extensively modified to improve its sound quality. The 2.1 x DAC is from the same family and the secret of their sound quality is that they operate in non oversampling mode with no digital filtering at all and have zero feedback valve output stages. The Audio Note 5.1x has been described as the ‘best DAC on the market’ by several reviewers. ![]()
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