Photography by Unknown
Fascia - Anodised Aluminium or Black Acrylic
DAC 3.1x/II Balanced
The Audio Note (UK) DAC3.1x Digital to Analogue converter has been specifically engineered for sonic performance rather than technical specification, and fulfils all Audio Note (UK) Level 3 criteria: -
Pure Class A operation
Zero negative feedback
Single Ended circuit topology
Materials and component quality
Extensive research into the fundamental properties of the data stream itself have shown beyond doubt that, regardless of the theoretical advantages of the signal manipulation employed in our competitors products, such as higher over sampling, noise shaping, re-clocking or jitter reduction, these corrective measures greatly interfere with the critical time domain requirements of the signal..
Music is a time continuum from start to end which when broken is irreparably damaged, and no amount of clever manipulation can restore it to its original time / frequency / amplitude duration or relationship, regardless of what the theorists may tell you.
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. All we do is to reformat the data stream to allow the converter chip to be able to interpolate the incoming information correctly.
In other words, the Audio Note (UK) DAC3.1x has no over sampling, no jitter reduction, no noise shaping and no re-clocking. 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. 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!).
The filter-interface coils / transformers are of extremely high quality, and are custom designed and manufactured in house by us.
The DAC3.1x/II Balanced features an upgraded version of the classic Audio Note (UK) Line preamplifier output stage, using a pair of ECC82 / 5814a double triode valves. This is coupled to an output transformer, wound with Audio Note (UK) copper wire. With a 33:1 step-down ratio, this output transformer not only has exceptionally wide frequency response, but also just about the absolutely best dynamic transfer function possible. The analogue output has provisions for both single ended and balanced operation, using the best available quality RCA and XLR connectors.
To power this spectacularly revealing arrangement, we have incorporated a dual channel power supply with double choke filtering and valve rectification. This technique not only provides excellent isolation between the digital circuitry and power supply, but also provides well-isolated short and clean analogue signal paths. The digital power supply is an exceptionally low noise, shunt-type.
Internal component quality is of extremely high quality. Audio Note (UK) Copper Foil capacitors and high quality resistors are used in key areas throughout the circuit. Analogue stage filter inductors and internal wiring are all produced with our own Audio Note (UK) wire.
RCA 75 Ohms SPDif
XLR 110 Ohms AES/EBU
600 Ohms, Balanced or Single Ended
Less than 0.2dB
2 x ECC82 / 5814a
1 x ECL82
1 x 6X5
145mm (h) x 450mm (w) x 425mm (d)
18Bit Ananloue Devices AD1865N
44.1 / 48 / 96KHz input capability.
Due to Audio Note (UK)'s ongoing research and development program, specifications are subject to change without notice.