A fundamental characteristic for the highly acclaimed
D-7 series of the standard D/A converters is to keep
evolving and upgrading each version. At TechDAS we
continuously work on research with the aim of improving
the D-7, bringing it to new heights. During this
development, starting with a fundamental principle of
audio performance, we have focused on the redesign of
the power supply and casing.
How much has the competition for higher resolution
contributed to a better sound quality? Of course high
spec data has a good amount of potential for a better
sound quality but there are far more factors to define
the quality itself. The overall sound relies far more on
the mass of the power supply and chassis. TechDAS have
accomplished refinements to those fundamental factors to
push the D-7 into another dimension.
Through the development of Air Force One reference
analog turntable, we at TechDAS have accumulated a
substantial understanding of metallurgy. The property of
metal can be drastically changed by the difference of a
minute amount of alloying additives, and a great asset
to us is to have such an extensive knowledge on what
influences the physical property of a metal can have on
sound quality, how the sound quality will change
according to the combination of metals with different
degrees of strength or hardness, and so on. D-7 Supreme
was born from the devotion of this mining of knowledge
as an authentic high-end D/A converter.
Major features of D-7/D-7i Supreme
- Employs a large independent toroidal transformer for
digital/analog signals, with twice as large a capacity
as the original model.
- Constant voltage circuit with zero feedback of full
- Hybrid chassis with a clad structure of aluminum and
brass which controls resonance. Main unit constructed
from solid aluminum.
- Sits on three large spiked feet of brass. Two frontal
spikes are directly connected to the toroidal
transformer to quickly remove all minute vibrations.
- Comes with newly developed TechDAS Insulation Base
which is made of super duralumin and DLC. The insulation
base works in unison with the brass spikes and quickly
removes all minute vibrations which originate from the
main unit, while also perfectly insulating any
influences that start from the mounting surface.
- Key parts carefully selected for high sound quality.
•Supporting DSD files by DSD Over PCM (DoP)
The Wolfson WM8741, TechDAS D-7 series employed for D/A
chip has an capability to process the DSD file in
The D-7i/192DSD and D-7/192DSD is supporting the DSD
file through by theDSD Over PCM (DoP) Spec.
•Supporting USB 192kHz
Fully prepared for the coming of age of high resolution.
USB input: Perfect construction to give sound quality
top priority based on asynchronous transmission by XMOS
made controller and dedicated software. Perfectly
supports 176.4/192kHz, 24bit.
Supporting OS: WINDOWS XP (SP2 or later,) WINDOWS Vista,
WINDOWS 7, Mac OSX 10.6 or later. WINDOWS OS needs to be
installed with attached driver
•Digital input: Up to 192kHz for also TOS, RCA input
•Supporting iPod Digital Out
D-7i/192DSD, "i" model Enables direct digital input from
iPod by connecting the USB cable attached to iPod into
the front USB-A terminal.This function allows you to use
your iPod as a high-end audio player.
*The front USB-A terminal is also mounted on D-7/192DSD
but not functional.
•High performance D/A converter
High grade DAC chip corresponding 192kHz made by the
established Wolfson from England is used. All input
terminals accept up to 192kHz/24bit for digital input.
Ensures low jitter by mounting a dedicated clock in D/A.
•Powerful power supply
The key of the sound quality for audio products is the
power. TechDAS designed a full-scale power supply
ignoring costs. Adopts power circuit with large leeway
by using two high capacity power transformers with one
of them used as an independent power supply dedicated
for analog circuit.Provides convincible music
reproduction by solid sound structure with energy on
each particles of the sound.
•External clock input terminal
External clock input terminal accepting 10MHz standard
signal enabling higher-grade performance in connection
with atom clocks or other clocks.
•Sampling rate converter
Sampling rate converter mounted to reduce jitter for all
digital inputs.Integral multiple upsampling is
selectable between x1, x2 and x4 by the switch on the
front panel (up to x2 for 88.2kHz and 96kHz signals.)
•Balanced output (XLR) and single ended (RCA)
DAC output: Balanced output is equipped as standard in
addition to single ended (RCA). Perfect for usage as
high-end DA converter.
•Pre-output terminal (RCA)
Variable pre-output is included as standard equipment
enabling usage as DAC-Pre. Volume carefully selected
giving highest priority to sound quality enables to
build a compact system with high sound quality by
connecting with power amplifiers or speakers with
•Digital output terminal (SPDIF)
Digital output terminal (SPDIF) on the back panel
corresponds with sampling rate converter and can be used
as an upsampling converter. It can also be used as DD
converter that converts USB input to SPDIF
*Apple policy does not allow digital output for iPod
•High-grade headphone amplifier
Equipped with standard headphone jack. High-grade
headphone amplifier based on dedicated board fully
drives high impedance high-end audio headphones and
provides excellent sound quality and S/N.
Board structure with high expandability
Structure of internal board layout: Boards from each
parts -digital part, analog part and USB interface part-
are independent of each other. This will create the
merit to prepare for future updates, as well as to take
care of the sound quality by preventing mutual
Possible to add LAN terminal in the future. Also
possible to support network audio with future update.