DAC End 24 PCM
DAC - Hi-Resolution System
December
2014
INTRODUCTION
After the great results achieved by the projects
DAC End 2 created in
collaboration with
Quanghao for the
realization of the modules,
we had the idea of creating a new
No
Oversampling project based on the
AD1865 chip.
The No Oversampling DAC give a more natural sound but if you ear the Phlips
DAC chips like the TDA1541 and the TDA1543 in this configuration seem
to lose details.
The AD1865N-K with passive I/V give a perfect
combination, natural sound and all all the details.
This DAC chip is used
also by Audio Note in all the production range.
So if you want to
continue to use the CD player because you have many CD and you are not
interested to play the few DSD files available on the market, this project
will give you the best sonic experience.
You can also connect the PC on
USB input to play Hi-Resolution PCM tracks.
It is necessary a vacuum
tube stage on output to have the standard 2Vrms but here you can find many
solutions like SRPP or single ended.
The new DAC End 24 module have these features:
- separated fast shunt for
the digital section
- separated fast shunt for the analog section
- Amanero module integrated to have USB input and
to support 24bit 44,88,96 and192KHz PCM
- No oversampling
- No
digital filter
- 3 spdif input: coax RCA, Toslink optical and AES/EBU
- passive I/V
Quanghao
sell this complete DAC module assembled including the including the Amanero module at
300$ + shipping.
It is also available the single ended vacuum stage with
the r-core transformer and the chassie, the cost of the assembled version is
near to 850$.
USB - I2S MODULE
I have tested these USB-I2S interfaces and I have found very big
differences in the sound:
After 3 tests in 2
different rooms, 3 different systems, with 2 my friends I can affirm that XMOS
and Amanero modules are the best.
The Amanero module sounds more open and
detailed but also less solid and less smooth of XMOS module.
The XMOS module sometimes seems more confused but it also have a larger
image of the acoustic scene.
The Amanero can play also 32bit 384KHz and DSD files (SACD format) but this
DAC is limited to 24bit 192KHz PCM.
AD1865 DAC MODULE
The DAC module use a dedicated power supply with shunt separated for any section
of the AD1865.
All the power supply use a controlled
current source and a hi-speed shunt linear regulator.
This module can be configured to select 4 different inputs
with a simple selector:
Follows the spectrum at 1KHz 0dB signal, the distortion is near to zero and we
have 132mVrms on DAC outputs.
OUTPUT STAGE
This is a
single ended vacuum
stage output stage using 6922 tubes able to drive any amplifier with input
impedance min 50Kohm.
The dedicated power supply of this output stage use a
high voltage shunt regulator to have the best sonic performances.
PHOTOS
SOUND
There are many articles about no oversampling and digital
filter-less DAC.
Also this project follow the philosophy of Ryohei Kusunoki.
These dac give very natural sound very close to the
playback from analog sources.
If we compare this DAC with last generation of
DAC like the ES9018 you will immediately feel a more natural sound but some
little details may be missing.
I suggest to use this DAC with solid state
amplifiers or single ended vacuum tubes.
