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Overview: |
ADI-8 DS is
an 8-channel AD/DA
converter with
reference approach.
The compact 19" 1U
rackmount enclosure
includes several
outstanding
features, like
Intelligent Clock
Control (ICC),
SyncCheck,
SyncAlign,
TDIF/ADAT converter
and Bit Splitter.
AD- and DA-circuit
automatically
operate either
independently or
linked. The latest
24-Bit converters
with 128 times
oversampling achieve
117 dBA true dynamic
range. All digital
inputs and outputs
operate at full
24-bit resolution.
If you have been
waiting for a
flexible, fully
professional yet
affordable
multi-channel
converter - the wait
is over!
The ADI-8
DS is
nearly
identical to
the ADI-8
PRO.
Additional
features
include 88.2
and 96 kHz
sample rate
and Dither.
DS stands
for Double
Speed,
meaning
double
sample rate.
As ADAT
optical does
not support
sample rates
higher than
48 kHz the
DS mode
requires two
channels to
transmit the
data of one
channel. The
used method
called
Sample Split
is
compatible
to S/MUX,
and also
found in the
Hammerfall
and
Hammerfall
Light. The
combination
Hammerfall/ADI-8
DS allows
DVD-compatible
Hi-End
recordings
(up to 8
channel @ 96
kHz), at an
astonishing
low price.
Use the
following
feature list
to compare
our ADI-8
DS with
all other
multitrack
converters,
and you will
agree: The
ADI-8 DS has
the best
price/performance
ratio!
-
8
channel
AD-converter,
completely
symmetrical
and
DC-coupled
audio
path,
117 dBA
SNR AD
-
8
channel
DA-converter,
balanced
output,
112 dBA
DA
-
ADAT
optical
inputs,
24-Bit,
based on
RME's
unsurpassed
Bitclock
PLL for
sample
accurate
lock
-
ADAT
optical
outputs,
24-Bit,
fully
compatible
to all
ADAT
optical
inputs
-
TDIF-1
interface,
24-Bit,
Low
Jitter
PLL,
Emphasis
support,
DA-88
compatible
-
Bit
Split/Combine,
Copy
Mode,
ADAT and
TDIF
usable
in all
combinations
-
Copy
Mode
adds a
unique
24-Bit
ADAT
to/from
TDIF
converter
-
Digital
Patchbay
operation,
allows
to copy,
duplicate
and
distribute
the
digital
input
signals
-
Dither
available,
for full
compatibility
to
16-Bit
even at
96 kHz
-
SyncCheck,
unique
technology
to check
clock
synchronisation
-
Virtual
Sample
Buffer,
allows
to use
the
internal
Low
Jitter
Clock (quarz
crystal)
even for
DA-conversion
-
Automatic
storage
of all
settings
.
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Connectivity |
- 8 x Analog I/O
- 1 x ADAT I/O
- 1 x TDIF-I/O
- 1 x Word Clock I/O
- Samplerate: up to 96 kHz
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Features: |
The ADI-8 DS'
astonishing
capabilities are
easy to explore
thanks to a simple
and easy to
understand user
interface. Let's
have a short walk
over the front panel
from left to right.
Setting up the ADI-8
DS starts with an
input sensitivity
that perfectly suits
your needs and
maintains the
excellent dynamic
range of the
AD-Converters. INPUT
LEVEL lets you
choose between Lo
Gain, +4 dBu, -10
dBV.
Each analog input
has its own 'Signal
Present' and 'Clip'
LED, so levels and
Overload are easy to
check. The key
PROCESS activates
Bit Split (spread
the 24-Bit signal on
two outputs), Double
Speed mode (DS) and
Dither (Dith.) Bit
Split allows two
8-channel 16-Bit
tape recorders to
record 8 channels in
24-Bit resolution.
Bit Split works with
both TDIF and ADAT.
RMEs intelligent
clock control (ICC)
provides
professional
features you won't
find anywhere else.
First set the clock
of the AD-Converter,
choose between
INTERNAL, EXTERNAL
(BNC word clock) or
INPUT (the digital
input signal ADAT or
TDIF.) The internal
clock can be 44.1/48
or - when DS is
active - 88.2 or 96
kHz. The
DA-Converter has the
same settings
available. The
current state of
locking and clock
synchronization is
shown by blinking or
constantly lit LEDs.
The next key DIGITAL
INPUT determines the
used digital input,
and the clock source
in case INPUT was
activated.
DIGITAL INPUT
is already part of
the DA-Converter
section. Next is
COMBINE which
activates both the
re-combination of
split signals back
to a full 24-Bit
signal and Double
Speed mode. The key
COPY MODE routes the
digital input to the
digital outputs ADAT
and TDIF. As these
operate
simultaneously
sending identical
data the ADI-8 DS
not only turns into
a superior ADAT/TDIF
converter, but also
allows copying
between devices of
the same format and
a distribution to
different devices.
For example an ADAT
signal can be
distributed to 2
ADAT plus 2 TDIF
outputs
simultaneously. In
Copy Mode also both
Bit Split and
COMBINE are
available, so it's
possible to
recombine a split
signal while
copying, or split a
not split signal, or
recombine and split
again into another
format. With this
the ADI-8 DS turns
into an extremely
powerful TDIF/ADAT
interface.
Each analog output
has its own 'Signal
Present' LED which
works in an analog
fashion (brighter at
higher levels.) A
push on OUTPUT LEVEL
sets Hi Gain, +4 dBu
or -10 dBV as analog
output level.
ADI-8 DS's
back shows an
impressive number of
connectors of all
kinds which result
in an unbeaten
flexibility and
compatibility.
Whatever it is -
simply get connected
and enjoy the sonic
clarity you've been
missing when doing
multitrack recording
for
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ADI-8 Inside Parts: |
The ADI-8 DS
internal structure
can be divided into
4 distinct
functional blocks:
-
Analog In:
analogue input
stage with gain
compensation,
A/D-converter
-
Analog Out: D/A
converter and
analogue output
stage with gain
compensation
-
Digital I/O:
ADAT optical and
TDIF interfaces
-
Clock Control:
Controls all
timing for all
functions, Word
Clock I/O, PLL
This
photo shows the
internal structure
of an ADI-8, after
having opened the
case.
As the Schematic
view clearly shows,
the ADI-8 can be
routed internally in
many ways which, in
addition to its
function as A/D-D/A
converter, allows it
to be used as a
format converter,
distributor or
splitter.
-
Format
converter:
24-bit digital
conversion from
ADAT optical to
TDIF and vice
versa
-
Distributor:
Sends digital
input to all
outputs
simultaneously,
e.g. TDIF in to
TDIF out and 2 x
ADAT
-
Splitter: Sends
analogue input
to all digital
outputs
simultaneously,
i.e. for A/D
conversion to 2
x TDIF and 2 x
ADAT
.
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Analog to Digital: |
Physical access to the analogue inputs is
either via 1/4" stereo jack socket or 25-pin
D-type connector conforming to the Tascam
DAxx analogue I/O pinout. These recorders
are very common, so a suitable multicore
cable (e.g. for connecting directly to
mixing consoles or to XLR) should be
relatively easy to find. The entire input
stage - from the sockets to the converter
chip's internal input - is fully
symmetrical. This is a special
servo-balanced input circuit: if the signal
at the input is unbalanced, input gain is
automatically adjusted by +6 dB. Otherwise
input sensitivity for an unbalanced signal
would have been lower than for a balanced
one.
Any A/D converter is only as good as the
gain compensation at the input. The ADI-8
has 3 gain levels, making it compatible with
a wide range of studio equipment - loss is
avoided before the signal gets to the A/D
converter. Input gain is switchable between
Lo Gain, +4 dBu and -10 dBV, and employs a
special damping technique: using latest
hi-grade electronic switches (ADG 451), the
gain switch could be placed in the best
possible position within the signal path.
This approach makes additional amplifier
circuitry or long cables to mechanical
components unnecessary (and obsolete.) The
D/A converters get the best quality signal
possible, so they can reach maximum SNR
(signal-to-noise ratio) with minimum
distortion
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Tech Specs: |
Input AD:
1/4" TRS jack and 25
pin D-type
connector, servo
balanced, completely
symmetrical
DC-coupled audio
path
Output AD:
ADAT optical, TDIF-1
(both 24-Bit), word
clock
Input DA:
ADAT optical, TDIF-1
(both 24-Bit), word
clock
Output DA:
1/4" TRS jack and 25
pin D-type
connector, servo
balanced, DC-coupled
audio path
SNR AD: 117
dB(A)
THD AD: <
-110 dB (< 0,00032
%)
THD+N AD: <
-104 dB (< 0,00063
%)
Crosstalk AD:
> 130 dB
SNR DA: 112
dB(A) unmuted
THD DA: <
-104 dB (< 0,00063
%)
THD+N DA: <
-102 dB (< 0,0008 %)
Crosstalk DA:
> 110 dB
Input/Output
level at 0 dBFS @ Hi
Gain: +19 dBu
Input/Output
level at 0 dBFS @ +4
dBu: +13 dBu
Input/Output
level at 0 dBFS @
-10 dBV: +2 dBV
Frequency
response AD/DA
-0,1 dB: 5 Hz - 21,5
kHz (sf 48 kHz)
Frequency
response AD/DA
-0,5 dB: < 5 Hz -
44,8 kHz (sf 96 kHz)
Power supply:
internal, 100 V-240
V AC, 100 V-240 V AC
Dimensions
483 x 44 x 200 mm
Warranty: 2
years
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