ALLNIC AUDIO D-10000 User manual

D-10000
DIGITAL TO ANALOG CONVERTER
OUTPUT TRANSFORMER-LESS / OUTPUT CAPACITOR-LESS
OWNERS MANUAL

Allnic Audio
D-10000 OTL/OCL
Digital to Analog Converter
Thank you for purchasing this Allnic Audio D-10000 OTL/OCL Digital to
Analog Converter (DAC). We are certain your trust in Allnic Audio and
Audiomentors, as well as your appreciation for the sound of this
innovative and ground-breaking device, will be rewarded by its excellent
operation for many years to come.
Please read this entire manual before you connect the D-10000 OTL/OCL
to the other components of your system and the electrical receptacle.
Audiomentors (Allnic Audio marketing company)
415, Daeduck Plaza
19-4 Sunae-dong, Bundang-gu,
Seongnam-si, Gyeonggi-do,
13595 S.Korea
Direct Telephone: [phone]
email: [e-mail]
Website: www.audiomentors.co.kr
** Information and specifications for the Allnic Audio product
described in this manual are subject to change without notice

TABLE OF CONTENTS:
INTRODUCING THE D-10000 OTL/OCL
DIGITAL TO ANALOG CONVERTER
1
WHAT’S IN THE BOX?
3
SAFETY
4
CLEANING
Chassis
Connectors
4
INITIAL SET-UP
Location, Location, Location
Power Connection
Inputs
Outputs
External Clock Connection
4
4
5
5
5
6
INITIAL POWER ON
6
OPERATION
DSD Playback and “CONV” (Conversion to DSD)
PCM Playback and UPSAMPLE
The Remote Control
The Balance Meters
Tubes
6
7
7
8
9
9
SPECIFICATIONS
10
WARRANTY
11
FIGURES
12
Please read about SAFETY before you attempt to use the D-10000
OTL/OCL DAC - we care about our customers and the equipment, and
we want you to enjoy this product for a long time!

1
ALLNIC AUDIO D-10000 OTL/OCL DAC, ANALOG OUTPUT SIGNAL PATH
_________________________________________________________________________________
The D-10000 OTL/OCL (Output Transformer-Less/Output Capacitor-Less) DAC has a pure triple gain
stage analog signal path. It uses the 6C19P low internal resistance tube to pass the analog signal
directly to line-stage or integrated amplifiers.
In common circuits, output capacitors or output transformers are required to separate the AC music
signal from the DC operating potential. If this is not done, the latter will destroy the power amplifier,
the loudspeakers, or both. However, these two coupling devices also introduce their own influences
on the transmission of the musical signal, adding their own character (colouration), increasing
distortion, and consuming small signals, all as predicted by physical efficiency theory. In addition, they
also limit signal dynamics. For these reasons, the elimination of output transformers and capacitors
has been considered the best solution for the design of the most accurate amplifiers. Removal of these
two coupling devices from the signal path achieves the best results possible:
• No colouration of the musical signal
• Extremely detailed expression, natural harmonics and subtle musical decay
• The lowest possible distortion
• The widest musical dynamics and frequency range
In the D-10000, there is no coupling device between the DAC and the preamplifier; that is, the final
gain/output tubes are directly connected to the preamplifier. Thus, the benefits listed above are fully
present in the Allnic D-10000 OTL/OCL.
Some circuit experts might be concerned about DC potential in the music signal in an OTL/OCL design.
However, the chance of this problem occurring can be essentially and reliably 100% mitigated. To do
this, Allnic uses a “floating power supply circuit”, a design that deals with the issue by not creating any
DC potential in the first place, or such a small potential that it is harmless.
The D-10000’s OTL/OCL circuit is basically SEPP, “Single-Ended, Push-Pull”, so a “cancellation circuit” is
required to adjust the balance of signal between the upper and lower power output tubes’ input grids.
Allnic uses an extremely sophisticated “Active Balanced Positive and Negative Feedback Circuit”, in
which the 7258 pentode perfectly controls the circuit’s operation with extremely low distortion and
incredible speed.
The D-10000 OTL/OCL is a world-class, reference level, DAC. It offers unbelievably realistic, holographic
sound-staging combined with incredible resolution, clarity, micro-dynamics, and drive. Instrument and
vocal tones and timbres are breathtakingly lifelike, and the placement of instruments and bodies in
three dimensions startling, life-size, and addictive. The D-10000 OTL/OCL has no voice of its own, none.
It is silent, except for the music emanating from the blackest of backgrounds. In addition, the
stunningly realistic sonic quality is matched by the simple elegance, flexibility, and ergonomic
functionality of the D-10000 OTL/OCL’s casework and connection options. The D-10000 OTL/OCL is
truly a masterpiece and is Allnic Audio’s top DAC.

2
_______________________________
WAVERSA SYSTEMS CUSTOM DIGITAL PROCESSING
With a digital section designed by Dr. C. Shin, principal of WAVERSA SYSTEMS and an expert in high-
resolution digital and digital to analog design for both military and commercial applications, the D-
10000 OTL/OCL DAC is unique in the marketplace. Except for the DAC chip it employs, the ES9018K2M
SABRE 32 Reference DAC (“Sabre DAC”), none of the D-10000 OTL/OCL DAC’s digital components are
sourced from the audio supply market. In addition, the USB interface and SPDIF receiver are
specifically customized for use in the D-10000 OTL/OCL, and custom-built high end up-samplers are
utilized for user selectable DSD conversion and PCM up-sampling.
The D-10000 OTL/OCL offers the listener the flexibility to select listening directly to:
• the source drive’s audio signal at its native sampling rate, or down-sampled if that signal is
above the limits of the D-10000 OTL/OCL’s digital inputs, 384 KHz (so long as the source is
of sufficiently high quality – see “Operation”);
• a PCM signal from the source drive converted to DSD 128 in “real time”; or
• a PCM signal up-sampled from the source drive’s native rate by a custom up-sampling chip.
The ES9018K2M SABRE 32 Reference DAC is a high performance 32-bit, 2-channel audio D/A converter
with sampling to 32/384 KHz, DSD 128 and a 1.5 MHz up-sampler using a field programmable gate
array (“FPGA”) USB interface. In the D-10000 OTL/OCL, however, the Sabre DAC chip is used for digital
to analog conversion only; all audio signal processing is performed by a Waversa Systems custom
designed processing chip set.
The D-10000 OTL/OCL converts PCM to DSD in real-time when CONV (“Conversion”) is selected using
the D-10000 OTL/OCL’s chassis face or remote control. When conversion to DSD is selected, all PCM
input samples are converted to 128 DSD via a custom built internal 5.6 MHz up-sampler and FPGA
DSD converter.
The D-10000 OTL/OCL up-samples PCM when UPSAMPLE is selected using the D-10000 OTL/OCL’s
chassis face or remote control. When up-sampling is selected, all PCM input samples are up-sampled
using Waversa Systems’ custom built 1.5 MHz audio signal processing chip, which also then down-
samples to the selected sampling rate prior to sending to the Sabre DAC for digital to analog
conversion.
The USB interface is implemented through network player hardware by Waversa Systems and is UAC2
standard compliant. This provides an extremely clean digital audio signal through complete galvanic
isolation, which strips the digital signal of any PC noise commonly created by a server’s internal power
supply. Firmware updates and music data are also communicated through the single provided USB
input. This is accomplished by a special interface, again unique to Waversa Systems.