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Kategorie: D/A-Wandler

Ausstattungsliste: 47 Lab Progression DAC Model 4705 with Model 4799 Power Dumpty


  • Non-Oversampling, No digital filter
  • No analog filter
  • World`s shortest signal pass length --- 35m/m
  • World`s smallest number of parts ------ 20 parts
  • Two piece chassis/casting made out of machined aluminum block


To Experience the True Possibility 
of 16bit/44.1kHz Format
  • Non-Oversampling, Digital-filterless DAC

    Non-Oversampling DAC concept was first proposed by Ryohei Kusunoki in late 1966. In recent interview, he states that "the issue is not either it is Non-Oversampling or Higher-rate-sampling, but the use of the digital filter can cause smearing in the time domain."
    We can confirm this smearing effect on the sound caused by the use of digital filter rather easily through listening experiments. This leads us to believe that the current problem with CD is not the limitation of 16bit/44.1kHz format, but the use of the digital filter which is preventing us to experience the true possibilities and the limitations of 16bit/44.1kHz format. The sound of Progression is enough to prove this matter.

  • Passive I/V conversion

    In Progression, I/V conversion is handled by a passive device instead of an active one. The result is a superb transient response without any over-shooting, and still maintains the output voltage of 2.1V.

  • World`s shortest signal pass length and smallest number of parts

    Our design priority, "Shorter the signal pass length, smaller the number of parts, better the sound" is most effective on digital components. 
    The signal pass length of Progression is 35m/m (including the length of parts), and the number of parts is 20. We are especially proud of achieving such a short signal pass length. We believe this defines the limit of short signal pass length on any production-model DAC.

  • 2 piece machined aluminum-block chassis/casing

    Chassis/casing of Progression is machined out of 2 pieces of solid aluminum block. The thick aluminum chassis/casing prevents the dispersion of digital noise and the use of only three screws in construction reduces the amount of stress on the chassis dramatically.
    These construction qualities all contribute to the quick transient response, totally stable imaging and the flat energy balance of the sound.
    The curved design of the top and bottom casing is no gimmick either. It holds a function as spike feet to release the vibrations smoothly and stabilize itself without any insulators underneath.

  • POWER DUMPTY to drive Progression with enough capacity

    Power Dumpty, a brother of Power Humpty, contains 120VA cut-core transformer, which has a capacity of 200VA, giving extra support to the deep, dimensional sound of Progression. It can also supply the power to our upcoming Model 4713 Flatfish CD transport at the same time with the DAC. The user of PROGRESSION can make a complete CD player system by adding just the transport without extra power supply.

4705-G Progression/Gemini DAC

Gemini is a special version of Progression DAC. Gemini comes with 2 Progression circuitry, each handling left and right channel separately, in the same Progression casing. 

For the maximum performance, we recommend Gemini to be driven with 2 Power Dumpties.


Any CDtransport/player with unbalanced digital output and any pre-amplifier/amplifier with unbalanced inputs.

Ausstattung & technische Daten
Input sampling frequency 32kH, 44kH, 48kH
Output voltage 2.1V
Digital input 1 Coaxial
Analog output 1 pair, Unbalanced
Dimensions Model 4705 60(w)x70(h)x162(d) m/m
Model 4799 130(diameter)x195(d) m/m
Interessante Testportale:
  • www.heimwerker-test.de
  • www.hausgeraete-test.de
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