MyTek | Stereo 192 ADC | User manual | MyTek Stereo 192 ADC User manual

MyTek Stereo 192 ADC User manual
STEREO192 ADC
MYTEK DIGITAL.USA
96
192192
TRIMPOTS
SWITCHABLE
L
R
48
IN
POT
TRIM
FS
88.2 SYNC
176.4
44.1
WCK
/SUPERCK
INT
MASTERING ANALOG TO DIGITAL CONVERTER
USER MANUAL
VER. May 2006
Quick Start……………………………………………….3
Introduction..…………………………………….............4
This manual may be updated
Operation- Internal jumper settings........................……...5
Download the newest version at:
Operation- Typical setup -Balanced Signal Source……...7
http://www.mytekdigital.com/
Operation- Analog input alignment……………...………9
Operation- Unbalanced Signal Source…….......................10
For technical support, technical tips and support check:
Sampling frequencies and External synchronization…....12
http://www.mytekdigital.com/
Rack mount shelf.......................................….....................14
or contact Mytek tech support at:
Companion Stereo Series Converters………………….....15
Info2006@mytekdigital.com
Specifications…………………………………………......17
Warranty conditions……………………………………...18
or at:
tel. (646)-613 1822
fax.(212)-202 5331
Mytek
151 Lafayette Street 3rd Fl
New York NY 10013
USA
1
2
Pot/Trim selector assigns either as
the input sensitivity controls. They
set input sensitivity with range from
mute to +4dB=-6dBFS. Precision 10
turn trimpots allow for precise level
alignment while the knob is
intended for quick “on the fly”
adjustments. Refer to "Alignement”
for details.
Sample rate selection.
Sets the desired
sample rate. When
used with external clock
select FS closest
matching that of
supplied external
wordclock.
Introduction to
Stereo Series Converters
Peak meter in -dBFS.
The red LED marked
"0" corresponds to 1
sample overload.
The MYTEK Stereo series is an extended family of 1/3 rack units
which includes 96 and 192kHz capable converters, SRC and
Studio Clock. Stereo192 converters can be used as stand-alone
devices for variety of studio applications such as mastering,
recording and playback, whenever the highest quality conversion
is required. Stereo192ADC is currently the world’s highest
performance portable DC powered converter.
STEREO192 ADC
192
TRIMPOTS
SWITCHABLE
L
R
IN
POT
TRIM
FS
176.4
96
48
88.2 SYNC
44.1
Internal sync provides the best clock stability (10ps) and
thus the best conversion. External sync is intended for
complex systems. It can be a standard wordclock signal or
Protools (tm) 256X superclock. Refer to "Internal jumper
settings" for details. Since internal clock generator is top
notch, there is no sonic benefit from clocking
Stereo192ADC externally. The ultra stable ADC clock
however is a great clock to drive other digital equipment.
Line power is 115VAC/50/60Hz
(factory default) or
230VAC/50/60Hz switchable by
internal switch accessible after
removing the top cover. 1 Amp
slow blow 20mm fuse is also
accessible under the cover.
BAT
WCK
/SUPERCK
INT
Two LEDs
measure
battery
status.
They are lit
with AC
mains
Wordclock input (factory default)
can be set to alternatively accept
256 Protools (tm) Superclock (Mix
systems). Refer to "Internal jumper
settings" for details. 75 Ohm
termination (default off) can also be
set inside unit.
Power switch only
affects the AC
mains.
115/230 VAC and
fuse (type “T” or
“slow blow”, 1A) is
located under the
unit’s lid)
Analog inputs accept a
range of signals from +4dB
balanced down to
consumer unbalanced.
Refer to "Internal jumper
settings" for details.
Users choose Mytek converters primarily for their outstanding
sound quality. The sound of Mytek converters can be described as
"transparent". We design our converters to be as faithful to the
signal as possible, rather than follow philosophy of some other
manufacturers who offer "analog" or "tube" sounding converters.
Mytek converters are closest to a straight wire, which is especially
evident when used at full resolution. Sonically they are equal or
better than the most expensive mastering converters.
Stereo192ADC produces 20dB (10 times) less distortion than
typical converters found in budget recording equipment. On
Mytek website you can find and download various sound samples
to evaluate Stereo series sound quality and compare it to the sound
of other high end converter units. To download samples log onto:
http://www.mytekdigital.com
Stereo192 ADC features include:
DC POWER
7-12 VDC
Wordclock output provides high current
drive and a very stable low jitter clock. It
can be used as a superior house clock to
clock or synchronize other digital
equipment. Running Stereo96ADC on
internal clock and slaving the rest of
equipment to Mytek clock is the
recommended setting for best sonic
performance.
-
AES/EBU and SPDIF outputs are
simultaneous. They operate in "single wire"
mode for all sampling frequencies. These
outputs can be used to externally clock other
equipment with the same effect as wordclock
output. Clocking via AES/EBU line is
recommended especially when cables are
very long (over 20ft).
Battery jack accepts a 7-12 VDC battery for portable operation.
There is no sonic compromise when using battery power.
Power switch is only active with AC Power. Battery with lesser
Voltage is recommended as its capacity will last longer.
3
-
44.1, 48, 88.2, 96, 176.4 and 192kHz internal sampling
frequencies
24 bit resolution
Ext. wordclock sync 25-100kHz or 256x Superclock(tm)
120dB Dynamic Range
Switchable precision 10 turn-trimpots or input gain knob
Wordclock output can be used as a hi-end house clock.
4
Stereo192ADC internal trimpots and jumper assignments
(remove top cover to access)
Stereo192ADC internal trimpots and jumper assignments
(remove top cover to access)
Jumper JP5: Wordclock input 75 Ohm termination.
Connect this jumper when Stereo96 ADC is the last destination in a chain fed
by external wordclock source and the cable is long (above 6ft). For short cables
and wordclock sources with unknown drive capability JP5 should be left
unconnected (unterminated) (retain the jumper on one pin only).
DIPSWITCH SW4 : Sets the clock mode on BNC in/out
SW1- "ON", wordclock =FS/2 for 88.2 and 96k (FS for 44.1 and 48k)
SW1- "OFF", wordclock =FS for all sampling rates
SW2- "ON", output and input becomes Superclock=256 x FS (for use with
Protools(R) Mix systems and 44.1 and 48k only)
115VAC/230VAC
power switch
Jumpers J1 and J2- Set the input to unbalanced. The unbalanced signal should
be fed between pin 2 (signal) and pin 1 (shield) of the input XLR. Pin 3 must be
left unconnected. You can use a standard RCA<>XLR adapter, but make sure
connection to pin 3 is cut inside the adapter. In this mode the sensitivity of the
input stage is fixed and cannot be adjusted within the converter (adjust level
prior to feeding the converter). This mode is recommended only in situations
when no professional balanced signal source is available. This also works with
-10dBV (consumer level).
T1 Amp 20mm
Slow Blow fuse
5
6
Typical Setup
Balanced signal source
Stereo192 ADC is equipped with 2 XLR analog inputs. For best signal to
noise performance it is recommended the signal source has a typical low
impedance output with standard +4dB line level balanced signal.
Alternatively a weaker unbalanced signal source can be used as described
in subsequent paragraph.
In typical setup the ADC is running on its internal clock with the rest of
equipment synchronized to Mytek clock either through digital output
signal or wordclock. In this configuration Mytek ADC serves as a very
stable low jitter house clock which increases the integrity and robustness
of the rest of the system. Because of careful design this clock is as good or
better than dedicated studio clock generators. Unlike in lesser quality
equipment there is no sonic benefit in clocking Mytek ADC externally. In
case of such operational need refer to "Sampling frequencies and external
synchronization".
Setup for typical balanced operation includes following steps:
1. Select either of input sensitivity controls:
The wordclock source can be terminated with internal 75 Ohm resistor
inside the Mytek unit (see: "Internal jumpers"). The termination is
recommended when using long wordclock cables (above 10 ft) and when
the wordclock source is capable handling such termination. Do not
terminate if the source is not capable of high current drive or cable is
short.
4. Select sampling frequency. If wordclock/superclock is used the
sampling frequency has to correspond to external clock frequency (can be
multiple, see: "Internal jumpers")
5. Synchronize the destination either to digital input sync or to wordclock
sync, depending on system configuration. The quality of recorded signal
does not depend on how the digital destination is synchronized with
Mytek AD converter.
6. Record- adjust input level with knob or by adjusting level at the source.
Unless you are printing final CD master, we do not recommend recording
too hot. There is no sonic benefit of pushing the level up to 0dBFS. A
healthy 1-2-3 dBs headroom allows more freedom in later processing and
mixing of recorded tracks. The red peak light is triggered digitally when 1
or more samples are overload. It's not recommended to peak frequently
although occasional overloads might be acceptable.
a. Input knob - this mode is recommended for casual use where the input
level is vaguely defined and needs to be quickly adjusted with input knob.
or:
b. Select precision 10-turn trimpots. Then perform "analog input
alignment" as described in the next chapter.
2. Setup all other connections.
3. Select desired clock source (sync), either internal or external. If
external wordclock or superclock source is required for systemic reasons,
setup its mode using the DIP switch as described in "Internal jumpers".
7
8
Unbalanced Signal Source
Operation
Analog Input Alignment
When using precision trimpots analog input level needs to be aligned
using an approx 1kHz sinewave fed from +4dB balanced source. The
alignment does not affect audio quality, only input sensitivity. The
alignment is performed using 10 turn trimpots. A small tweaker or
screwdriver is necessary.
You have to arbitrarily decide what will be your studio "0 VU"
analog/digital reference level. It is usually between -20 and -14dB. It
defines how much headroom you have left over the normal operating "0
VU" level. You may set it at the same level as other piece of equipment in
your studio. Some equipment is fixed at -18dB (which is low for most
rock and roll recordings) but good for more dynamic classical. Some is
fixed at -15dB which is a typical optimal level.
Stereo192ADC can be operated with weaker consumer level unbalanced
signal sources. Follow these steps in such case.
1. Unbalanced cable used to feed the unit must have signal connected to
pin 2 of XLR, ground (shield) connected to pin 1 and while 3 must be
disconnected. Wrong wiring of this cable can cause improper operation
resulting in elevated distortion or noise.
2. Set the jumpers to "unbalanced" and disconnect both the trimpots and
potentiometer. This sets the converter to its hights sensitivity (approx 10dB FS).
3. Setup all other connections.
1.Set the oscillator in your console at 1kHz and "0 VU". Send the
oscillator to the ADC analog input."0 VU" at + 4dB corresponds to 1.225
Volts RMS measured between pin 2 and 3 of the output XLRs. If you do
not have an analog oscillator, you can use a calibrated analog out of a DA
converter and generate the sinewave inside the DAW.
4. Select desired clock source (sync), either internal or extrenal. If
external wordclock or superclock source is required for systemic reasons,
setup its mode using the DIP switch as described in "Internal jumpers".
2. Connect a digital PEAK meter to a digital output. If you don't have a
dedicated digital meter use the most precise meter available in you
existing digital recording equipment or DAW.
The wordclock source can be terminated with internal 75 Ohm resistor
inside the Mytek unit (see: "Internal jumpers"). The termination is
recommended when using long wordclock cables (above 10 ft) and when
the wordclock source is capable handling such termination. Do no
terminate if the source is not capable of high current drive or cable is
short.
3. Adjust the analog input level to get appropriate reading of the meter
(for example -15dB).
4. Select sampling frequency. If wordclock/superclock is used the
sampling frequency has to correspond to external clock frequency (can be
multiple, see: "Internal jumpers")
The alignment has to be performed with accuracy of 0.1dB to be
considered accurate.
Similar alignment procedure with 0.1dB accuracy is required for valid
A/B listening comparisons btwn. different pieces of equipment. A slightly
louder source is typically perceived as "better" sounding.
6. Synchronize the destination either to digital input sync or to wordclock
sync, depending on system configuration. The quality of recorded signal
does not depend on how the digital destination is synchronized with
Mytek AD converter.
7. Record- adjust input level by adjusting level at the source. Unless you
9
10
Are printing final CD master, we do not recommend recording too hot.
There is no sonic benefit of pushing the level up to 0dBFS. A healthy 1-23 dBs headroom allows more freedom in later processing and mixing of
recorded tracks. The red peak light is triggered digitally when 1 or more
samples are overload. It's not recommended to peak frequently although
occasional overloads might be acceptable.
Sampling frequencies
and External Synchronization
In typical setup the ADC is running on its internal clock with the rest of
equipment synchronized to Mytek clock either through digital output
signal or wordclock. In this configuration Mytek ADC serves as a very
stable low jitter house clock which increases the integrity and robustness
of the rest of the system. Because of careful design this clock is as good or
better than dedicated studio clock generators. Unlike in lesser quality
equipment there is no sonic benefit in clocking Mytek ADC externally.
Mytek internal clock generator is situated within inches of converter chip
and it will always provide a better jitter performance (approx 10ps) than
any external source which is inherently compromised by cable
connections. If external wordclock or superclock source has to be used for
systemic reasons, the Stereo192ADC clock generator will lock to external
source and use a stabilizing PLL circuit to reduce incoming clock jitter
before it reaches the actual AD circuit.
Stereo96ADC can be operated with any of 6 standard sampling
frequencies or at any frequency btwn. 30k-200k when supplied with
external clock source. The measurable audio band performance (Dynamic
Range) stays virtually the same within all these frequencies.
44.1k will be typically used for printing final master. 48k is recommended
for digital video production.
The high sampling rates are recommended for discerning users requiring
uncompromised sound quality. In this mode the ADC features up to
100kHz bandwidth (instead of 20k for 44.1k) which allows for improved
transient response of recorded music as well as minimized the impact of
brick wall antialiasing digital filters on the upper audio band. The end
effect of hi-sampling recording is a more "analog feel" and easiness of
sound and more natural sounding instruments especially percussion or
cymbals.
A decision of choice btwn. 88.2/176.4k or 96/192k should be made based
on the project flow- there might be benefits for one or the other. 88.2k
may convert to 44.1k with less damaging SRC process, if such process is
available. Most ubiquitous software SRCs are not very good sonically
11
12
and must not be used for critical projects downsampling. Some such as
Faulkner Downsampler (http://www.audiosignal.co.uk/freeware.html)
provide excellent results for 88.2>44.1 but don't work for 96k. 88.2k is
also easier to upsample to DSD.
96k sample rate, has in our opinion, a marginally better perceived sound
quality than 88.2k but the difference is very small and difficult to perceive
for most people. If the record is going to be mixed in analog domain, 96k
might be a desirable choice for tracking.
13
Rack Mount Shelf
The Stereo96 ADC is 1/3 rack space wide and 1U tall.
Mytek provides a 1U rack mount shelf as accessory to mount up to 3 of
1/3 rack units. The units are attached to shelf with small screw connecting
the shelf to bottom through a threaded hole on the bottom of the unit.
14
Companion Stereo Series Converters from Mytek
this page will be updated
15
16
Warranty
Specifications
This Stereo192ADC digital audio converter is warranted by Mytek to the
original purchaser against defects in workmanship and materials used in
manufacture for a period of one year from the date of purchase. Faults due
to customer misuse, unauthorized modifications or accidents are not
covered by this warranty.
Conversion:
Linear,
128x oversampling at 44.1/48kHz
64x oversampling at 88.2/96/176.4/192kHz
Resolution:
24 bit
Sample rates:
44.1, 48, 88.2, 176.4, 192kHz
or wordclock 25-100kHz
Dynamic Range:
120dB
THD+Noise:
-106dB (<0.0005%)
Internal clock jitter:
<10picoseconds
Analog Inputs:
+4dBm balanced or unbalanced, 10kOhm
Digital outputs:
Hi-speed (25-200kHz) AES/EBU and SPDIF
External Sync.:
Wordclock in and out.
or 256x Superclock
Wordlock Out
used as house clock:
15 LS TTL loads max. Can be terminated.
Mains:
100/115V-220/240V 50/60Hz switchable
Battery Power:
7-12 VDC
Dimensions:
1/3 rack space wide x 1U high x 8” deep
(5.5”x 1.6”x 8”)
Weight:
4 pounds
No other warranty is expressed or implied.
Any faulty unit should be sent, shipping prepaid, to the manufacturer
service center. Prior to shipping the client should obtain from Mytek an
RMA# for warranty services. Units sent without RMA# will not be
accepted.
Mytek extends affordable repair service for all units manufactured to date
that are not covered by this Warranty.
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