OWNER'S MANUAL
MANUEL DU PROPRIETAIRE
MANUAL DEL USUARIO
BEDIENUNGSANLEITUNG
MANUALE DI ISTRUZIONI
GEBRUIKSAANWIJZING
D00712900A
D-70
Multi D/A Converter
ENGLISH
FRANÇAIS
ESPAÑOL
DEUTSCH
NEDERLANDS
ITALIANO
2
Important Safety Instructions
Y
AC POWER CORD CONNECTION
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG
TO WIDE SLOT, FULLY INSERT.
CORDE DE CONNEXION CA
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES, INTRODUIRE LA
LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU
FOND.
For CANADA
Pour le CANADA
CAUTION
< DO NOT REMOVE THE PROTECTIVE HOUSING USING
SCREWDRIVER.
< IF THIS PRODUCT DEVELOPS TROUBLE, MAKE A CONTACT
WITH OUR SERVICEMAN, AND DO NOT USE THE PRODUCT IN
A TROUBLED STATE.
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following
measures:
· Reorient or relocate the equipment and/or the receiving
antenna.
· Increase the separation between the equipment and
receiver.
· Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
· Consult the dealer or an experienced radio/TV technician for
help.
CAUTION
Changes or modifications to this equipments not expressly
approved by TEAC CORPORATION for compliance will void the
user's warranty.
For U.S.A.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
E
R
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated "dangerous voltage" within
the product's enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to
persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions in the literature accompanying the
appliance.
WARNING : TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS APPLIANCE TO
RAIN OR MOISTURE.
3
IMPORTANT(for U.K.Customers)
DO NOT cut off the mains plug from this equipment. If the plug
fitted is not suitable for the power points in your home or the
cable is too short to reach a power point, then obtain an
appropriate safety approved extension lead or consult your
dealer.
If nonetheless the mains plug is cut off, remove the fuse and
dispose of the plug immediately, to avoid a possible shock
hazard by inadvertent connection to the mains supply.
If this product is not provided with a mains plug, or one has to be
fitted, then follow the instructions given below:
IMPORTANT. DO NOT make any connection to the larger
terminal which is marked with the letter E or by the safety earth
symbol | or coloured GREEN or GREEN-and-YELLOW.
The wires in the mains lead on this product are coloured in
accordance with the following code:
BLUE
: NEUTRAL
BROWN : LIVE
As these colours may not correspond with the coloured
markings identifying the terminals in your plug proceed as
follows:
The wire which is coloured BLUE must be connected to the
terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.
When replacing the fuse only a correctly rated approved type
should be used and be sure to re-fit the fuse cover.
IF IN DOUBT -- CONSULT A COMPETENT ELECTRICIAN.
Important Safety Instructions
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance
with the manufacturer's instructions.
8) Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9) Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with
one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the
third prong are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use only with the cart, stand, tripod,
bracket, or table specified by the
manufacturer, or sold with the
apparatus. When a cart is used, use
caution
when
moving
the
cart/apparatus combination to avoid
injury from tip-over.
13) Unplug this apparatus during lightning storms or when
unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing
is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid
has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
< Do not expose this apparatus to dripps or splashes.
< Do not place any objects filled with liquids, such as vases,
on the apparatus.
< Do not install this apparatus in a confined space such as a
book case or similar unit.
< The apparatus draws nominal non-operating power from the
AC outlet with its POWER switch in the off position.
Obs! nätströmställaren skiljer ej hela apparaten fran nätet.
Contents
4
Thank you for choosing TEAC. Read this manual carefully to get
the best performance from this unit.
Advanced newly-developed Refined Digital
Output Technology (RDOT)
The traditional belief is that the upper limit of human hearing is 20
kHz. In real life, however, information at frequencies over 20 kHz
exists, and it is generally recognized that the presence of this
information can significantly enhance the listening experience.
However, when a CD is recorded, on account of the limitations of
the sampling frequency, the audio upper limit is restricted to 20
kHz. RDOT provides a way to overcome this limitation and break
the 20 kHz barrier, using the Fluency theory. The RDOT filtering
utilized in the D-70 is equivalent to 24-bit/96 kHz input--a
significant advance over the current 16-bit/44.1 kHz standard.
When this new RDOT is employed, sources with up to 192 kHz
sampling frequency, including the latest generation of audio
discs, can be read. Using a higher frequency allows the "gaps" to
be filled between the existing samples, effectively doubling the
sampling frequency. The listener finds it easier to distinguish the
sounds of individual instruments, even when many instruments
are playing at the same time, and the quality of recorded
reverberation is significantly improved, resulting in greater
realism, and a much closer approach to a live performance.
TEAC's unique RAM link using new circuitry
(Refined Asynchronous Memory Link)
In order to achieve an ideal jitter-free D/A converter, we have
installed a full 128Mbits' worth of RAM Link buffer at the first
stage of the DAC. The object is for the buffer to eliminate jitter
completely, regardless of the amount of jitter or the frequency
bandwidth. This results in an effective zero-error operation. The
large amount of RAM in this buffer allows all incoming jitter to be
absorbed completely in the buffer, and the data to be transferred,
using the internal high-precision clock, to the next stage of the
DAC.
Key benefits of using a large RAM Link buffer
1. Allows high bit-rate and high-frequency sampling.
2. Extended continued playback is possible, and the high RAM
capacity makes it unnecessary to continually adjust the clock
frequency.
3. In order to produce a jitter-free stream, the optimum position
for a buffer is immediately behind the digital filter. However,
when oversampling takes place, and if there is a large amount
of data to be buffered, then the RAM must be large enough to
take account of this. On the D-70, both these aims have been
achieved, with a buffer whose capacity is enough to handle
the demands made on it.
Servo-free direct clocking system
In the D-70, a servo-free direct clocking system is used, which
comes close to the ideal of clock control. In systems where a
clock other than the one derived from the digital audio signal is
used, typically PLL (phase-locked loop) technology is used to
keep the clock frequency as constant as possible. However, in
high-end equipment such an approach leads to problems when
designing circuitry that will not compromise the audio quality.
The new method employed in the D-70 to maximize audio quality
is to use a DAC locked to a
direct crystal-controlled fixed-frequency clock. This allows the
conversion to be carried out independently from the input
frequency and input jitter is therefore eliminated. In the case of
non-synchronization, the RAM Link buffer mentioned above
eliminates any potential problems.
Important Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
How to use the remote control unit . . . . . . . . . . . . . . . . . . . . . . . 7
Connection with digital units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connection to an amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Names of Each Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Basic operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Changing the settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5
ENGLISH
32kHz - 192kHz wide-ranging input sampling
frequency, with 24-bit input
The D-70 is an advanced D/A converter compatible with all two-
channel linear digital sources, as well as top-quality CDs. It
conforms to the AES 3 standard for dual-wire (XLR) input when
accepting data at 176.4 kHz or 192 kHz.
UP conversion feature allowing a maximum of
24 bit/768kHz
Two different filter algorithms: FIR (equivalent to HDCD), and
RDOT can be selected at the digital stage.
Custom settings can also be made, by using the two different
filters in series, for up to 16 times oversampling. Firstly, employing
the sharp roll-off characteristics of FIR, the more natural
extended characteristics of RDOT doubling the frequency can
then be added to produce a more musical result.
WORD SYNC output allowing synchronization
with CD transports, DD converters, etc.
The D-70 is further enhanced by the inclusion of word sync
outputs. This provides a very stable input to the RAM Link buffer,
and helps enhance the natural nature of the final audio signal.
Three kinds of GIC analog filters on the left
and right channels
Three different types of analog filter are provided in order to cope
with the range of input sampling frequencies, from 32 kHz up to
192 kHz, and the most appropriate filter is automatically selected.
These filters are based on secondary Butterworth GIC filter. The
automatic switching system isolates all filters, except the active
one, using relays, and inactive filters do not appear in the signal
path. This combination of features has the effect of producing
lossless high-quality filtered sound.
Discrete transformers for digital and analog
circuitry
This system completely removes any intra-system interference,
and provides clean regulated power independently for the digital
and analog sides. This is the cleanest, most precise power supply
that we can devise.
Ready for a IEEE 1394 interface (SACD and
DVD-A format compatible)
IEEE 1394, the next-generation high-speed digital link, is in the
process of inter-manufacturer standardization for employment
with the SACD and DVD-A formats. As soon as the necessary
steps for standardization have been agreed, the D-70 is
ready----with the ability to add a IEEE 1394 interface to the rear
panel. Rather than rush forward, we have decided to wait until
the standards have been set for both SACD and DVD-A, allowing
a dual simultaneous expansion of capabilities.
Super-solid body brings out the sound quality
A solid heavy (25 kg, or 55 lbs) body and chassis, uncommon on
DAC units, enhances bass response and feeling, as well as
improving the overall sonic performance.
< An 8 mm-thick steel base sheet totally isolates the unit from
external vibration.
< Triangular pinpoint feet composed of hardened steel help to
complete the mechanical isolation.
< Sturdy internal construction, using seven major functional
blocks, electrically isolated and independent from each other
to provide the best possible quality: digital, analog, power
supply (digital), power supply (analog), AC primary, word clock
and transformers.
HDCD® Decoding
While ordinary CDs are digitized to 16-bit resolution, discs
mastered to the HDCD®(High Definition Compatible Digital®)
standard use 20-bit resolution. Such discs are compatible with
ordinary CD players, but in order to obtain the maximum benefit
from the new process, you need an HDCD decoder.
The D-70 is equipped with HDCD, and can decode HDCD
recordings !
HDCD system manufactured under license from Microsoft
Corporation. This product is covered by one or more of the
following:5,479,168, 5,638,074, 5,640,161, 5,808,574, 5,838,274,
5,854,600, 5,864,311, 5,872,531. Other patents pending.
, HDCD®, High Definition Compatible Digital®, and
Microsoft® are either registered trademarks or trademarks of
Microsoft Corporation in the United States and/or other countries.
Multiple features for the best possible sound
Multiple digital inputs (three types, seven sets) with XLR, RCA and
TOS jacks
Two types and two sets (XLR and RCA) of analog output, as well
as a TOS optical digital output
Integral digital volume control. With the volume control, it is
possible to connect the D-70 directly to a power amplifier,
eliminating the pre-amplifier stage of an audio system. The sound
can be attenuated in 0.1dB steps to a maximum of 60dB (and
infinite cut).
Isolated pure D/A conversion when the digital data has been
read from RAM, the signal lines and the ground of the analog
circuitry are electrically isolated from the digital side, resulting in
pure D/A conversion.
The DAC is composed of four multi-bit DAC Burr-Brown PCM1704
units, with an outstanding signal-to-noise ratio and exceptionally
low distortion characteristics.
Features