The DAC features:
Additional Information about the characteristics of Mdoel 4705
- 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
- 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
- Non-oversampling, Digital-filter-less
by Ryohei Kusunoki
- 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
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
- POWER DUMPTY to drive Progression with enough capacity
Power Dumpty, a brother of Power Humpty,
contains 240VA 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.
Any CD transport/player with unbalanced digital output and any pre-amplifier/amplifier
with unbalanced inputs.