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multiverter
SRC-64
Sample Rate Converter
Add-on Module for MVR-mkII / MVR-64
User's Manual
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User's Manual
Table of Contents
1. GENERAL............................................................................................................. 3
1.1. Features........................................................................................................ 3
1.2. Box Contents................................................................................................. 4
1.3. Conventions used in this manual.......................................................................4
2. INSTALLATION..................................................................................................... 5
2.1. Hardware Installation......................................................................................5
3. CONFIGURATION................................................................................................. 7
3.1. Methods........................................................................................................ 7
3.2. Configuration steps......................................................................................... 8
3.3. SRC capacity............................................................................................... 13
4. MAINTENANCE.................................................................................................. 14
4.1. SRC selftest................................................................................................. 14
4.2. Determining SRC Firmware/Hardware version...................................................14
4.3. SRC Firmware Upgrade.................................................................................15
5. SPECIFICATIONS................................................................................................ 16
6. APPENDIX.......................................................................................................... 17
6.1. Warranty..................................................................................................... 17
6.2. Manufacturer contact....................................................................................17
6.3. Recycling..................................................................................................... 17
6.4. Document Revision History............................................................................17
6.5. About this document..................................................................................... 17
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SRC-64
1. GENERAL
1.1. Features
The SRC-64 add-on module adds the capability of asynchronous sample rate
conversion to your multiverter. Designed as internal add-on module, it leaves the
"Extension" port available to other break-out boxes.
(Note: The module is called "SRC" in this manual for clarity).
It features highest analog performance (THD+N -134dB typ.), bi-directional
conversion for total up to 128 channels (e.g. 64x64 bi-directional) between any
interfaces supported by the multiverter.
With the SRC installed, the multiverter accepts signals from two different clock
domains (A and B). Each input and/or output can be assigned to run either on clock
A or clock B. When routings are established between inputs and outputs on
different clocks, the signals are automatically routed through the SRC to match the
sample rate of the target.
Existing multiverter routing capabilities are fully preserved, SRC appears in the
background and is fully transparent to the user.
Special presets allow the use of two MADI or AES50 ports together, to send and
receive all 64 channels at 96 kHz (48ch for AES50) and to convert to 48kHz
(and vice versa).
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1.2. Box Contents
1 SRC-64 Module
2 Screws M3x6
2 Hex standoffs M3x11mm (use with older MVR-64 model)
This manual
1.3. Conventions used in this manual
A button on the front of the device is shown like this: Set
The encoder can be pushed. This is shown as OK
A particular LED on the front of the device is shown like this: ☼ WCLK
Text indicated on the seven-segment display is shown as 02
Operations in a particular control method are indicated by a diamond:
Front panel, ◆ Web ◆ or Command line ◆
A section marked with a warning sign mark tells you that the
information is particularly important to avoid damage or
malfunction.
Filled circles with an exclamation mark indicates an action
that must be performed (“Required”)
A section marked with a prohibited sign tells you that the
action indicated is prohibited (“Prohibited”)
A section marked with a “information” icon indicates a useful
tip. ("Information").
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SRC-64
2. INSTALLATION
2.1. Hardware Installation
CAUTION: To prevent electric shock, remove all mains power
plugs from the multiverter before opening!
ATTENTION: Static Sensitive Devices
Observe Precautions for Handling!
Remove the two screws at the rear of the multiverter's top cover
(Torx T10):
Flip the multiverter to detach the top cover. Disconnect the cover's ground
connection at the base.
Note: Due to tolerances, the lid does sometimes not open easily. In this case,
loosen the back panel screws (the four black ones on the back panel edges) a
few turns. Don't forget to fasten them again after installation!
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Locate the two hex studs .
MVR-64 only: Remove the indicated two screws from the multiverter's main
board, replace them by the supplied hex studs.
Carefully plug the SRC into the main board.
Make sure the SRC is plugged in correctly (mounting holes
align perfectly). Some SRCs are lacking index keys on the
connectors, making it possible to insert them with one row
offset right or left. In this case, the MVR won't turn on
(but it will not get damaged).
Fasten the SRC with the supplied M3x6 screws.
Re-connect the cover's ground connection to the base.
Slide the top cover into the front panel slit, then close the lid and mount the
cover using the two black screws.
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SRC-64
3. CONFIGURATION
3.1. Methods
The SRC-64 can be configured by different methods below. We recommend
configuration by the web interface because it's most obvious and allows you to do
channel-wise routing, but basic configuration is also available via the front panel.
For automation purposes, the SRC can also be configured on the command line
(telnet or serial).
◆ Front panel
Clock source selection and interface-wise routing is available through the front
panel:
MVR-mkII: Use the Source and Domain A/B buttons in the "Clock/SRC" group.
MVR-64: Enter the "Clock" menu, move the cursor to ☼ ASRC and push OK to
enter SRC configuration.
◆ Web control
Configuration via the web interface is the recommended method. This enables you
to route arbitrary channels through the SRC up to its full capacity.
◆ Command line
The SRC can be fully configured via the command line. Refer to the MVRs
command line description, or type "help" at the command prompt.
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3.2. Configuration steps
Without SRC, all interfaces run on the same shared "Clock A". With SRC installed,
one or more interfaces can be set to run at an alternative clock "Clock B".
Whenever a translation between clock domains A and B is needed, audio is
automatically sample-rate converted by routing it through the SRC module. This
process happens transparently in the background.
The configuration process involves the follwing steps which can be carried out in
any order:
1. Clock source selection for Clock A and Clock B
2. Assignment of inputs and/or outputs to either clock domain A or B
3. Routing
◆ Front panel
The method for configuring the SRC-64 depends on the multiverter model:
MVR-mkII
Clock source selection for A/B:
In the “Clock/SRC” menu, push
the Source button.
Move the cursor to the desired
clock source under the respective
"A" or "B" column.
Push the encoder OK or press
the Source button to select the
clock source, or press ⮌ Back to
cancel.
Depending on the selection, you
will be asked to provide
additional settings
(Samplerate/SMUX...)
Assignment of inputs/outputs to
clock domain A or B:
In the “Clock/SRC” menu, push
the Domain A/B button.
MVR-64
Assignments of inputs/outputs to
clock domain, and Clock B source
selection:
Push the Set button in the
"Clock" menu.
Navigate the cursor to the
☼ SRC LED and push OK to
confirm. The seven-segment
display shows 1n to indicate
the input interface selection
mode.
You can now select the row
(input) which should run on clock
B. Selecting "X" disables SRC for
the input. Note: Some modes
show two rows at once. This is
used if you want to concatenate
the channels from two inputs for
64ch at 96kHz.
Push OK to confirm.
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MVR-mkII (continued)
Move the blinking bar to the
desired input (horizontal) or
output (vertical) and push the
encoder to set "Clock B" for the
selection. This is indicated by a
white bar and SRC Status LEDs
"A>B"/"B>A" lighting up.
Repeat above step until all your
assignments have been done.
Then press ⮌ Back to exit the
menu.
Routing
Perform the routing as usual.
When the SRC is configured, all
routings that use the SRC will
show up as white when working.
The SRC Status ☼ A>B and/or
☼ B>A LEDs indicate white
when the SRC is active.
MVR-64 (continued)
The seven-segment display
shows 0u to indicate the
output selection mode. Select the
column (output) which should run
on clock B. Selecting "X"
disables the SRC for the output.
Push OK to confirm.
The seven-segment display
shows A5 to indicate the
"ASRC" clock selection mode,
and the ☼ SRC LED shows
orange. Navigate the cursor to
the desired clock source and
push OK to confirm.
Depending on the selection, you
will be asked to provide
additional settings (SMUX...)
Routing
Perform the routing as usual.
When the SRC is configured, all
routings that use the SRC will
show up as orange when
working. The clock LEDs in
orange indicate the setting for
clock B.
Only AES3, ADAT, and MADI support different sample rates
for input and output. For these interfaces, you can choose
clock domains for input and output independently.
For AES50, Dante and FlexLink, the input and output clock
domains are coupled together, which means that both input
and output use always the same sample rate.
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◆ Web
The settings for the clock sources can be found under the "CLOCKS" tab. When
using the SRC, make sure to switch "SRC function" to on.
When the SRC module is installed and enabled, its behavior can be selected in the
SRC section on the bottom. The settings above show a typical configuration for
converting MADI 96k to Dante 48k.
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To select which inputs and outputs use clock A or B, use the A/B switches in the
matrix view. The SRC is automatically inserted when any routing from clock A to B
(or clock B to A) is made.
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Figure 1: Typical routings for MADI 96k <> Dante 48k. Note that the clock source
for MADI coaxial inputs and outputs set to clock "B". The black check marks
indicate that the conversion is active with SRC involved (=white LEDs on the front
panel).
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◆ Command line
Clock source selection:
clock A|B [<source> [<srate>|<smux>]]
Available Sources: AES3,ADAT,MADISFP1,MADISFP2,MADICOAX,DANTE,FLEXLINK
(*)
Samplerate (only required for DANTE or INTERNAL):
44100,48000,88200,96000,176400,192000
SMUX (only required for AES3,ADAT,MADI*,AES50TP* in TP mode,WCLK): 1,2,4
SRC configuration / Clock assignment:
asrc enable|disable [<in> <out>]: Configures the ASRC.
disable
Turn off ASRC
enable
Turn on ASRC, using previously set parameters or
those specified below:
<in> <out>
Turn on ASRC, using previously set parameters or
those specified below:Interfaces which should run on
the alternate clock B. Possible Values:
AES3ADAT,MADISFP1,MADISFP2,MADICOAX,
AES50TP1,AES50TP2,DANTE1,DANTE2,
FLEXLINK1,FLEXLINK2,FLEXLINK3
(*)
Multiple values may be combined with comma, e.g.
'MADISFP1,MADISFP2'
If 'NONE' is specified, the ASRC is turned off for the
respective direction. If both <in> and <out> are
set to 'NONE' the ASRC is turned off.
Alternatively, <in> and <out> can be specified as
combined hex bit-mask, e.g.
(0x0001=AES3ADAT ... 0x0400=FLEXLINK3)
(*)
*
* Available interfaces differ on the MVR-64. Type "help" in the command line to see a list of available values.
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3.3. SRC capacity
Any combination of inputs and/or outputs can be assigned to either clock domain,
and channels routed between different clock domains are routed through the SRC
until its the maximum capacity is reached. The available SRC channels will be split
between directions A>B and B>A according to the following table:
Automatically optimized for A>B and B>A (in blocks of 16 channels) until 128
channels total are reached, when both sides run at x1 (44.1 / 48 kHz)
1
Up to 64x64 when either side is running at x2 speed (88.2 / 96 kHz)
Up to 32x32 when either side is running at x4 speed (176.4 / 192 kHz)
Channels routed within the same clock domain (A>A or B>B) are not routed
through the SRC and therefore require no SRC channel capacity.
Channels routed between different clock domains (A>B or B>A) which have
multiple destinations occupy only one channel on the SRC.
1 Requires SRC-64 firmware 2.0 and MVR-64 firmware 5.0. On older, the config is fixed 64x64ch
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4. MAINTENANCE
4.1. SRC selftest
To verify correct operation of the SRC, perform an SRC selftest. During selftest, an
internally generated sine wave is passed forward and then backwards through all
64x64 channels of the SRC (running two conversions, from 96kHz => 88.2kHz
=> 96kHz)
To enter SRC selftest mode: Press Recall , move to ☼ Function , move to
☼ 11 , press OK , turn the encoder until the seven-segment display shows 03
("SRC selftest") and press OK .
The resulting data is output on the headphones where it can be verified by
listening to it. The SRC works correctly if a clean, non-distorted 1000Hz sine
tone can be heard on all channels.
Use ☼ Ch to listen to the appropriate channel. The output volume can be
adjusted using ☼ Vol.
The resulting data is also output on MADI optical (channels 1-32) and MADI
coaxial (channels 33-64) as two 96kHz/32ch streams, clocked by the internal
clock of the multiverter. You can use any signal meter to check the result; the
output level should be -20dB on all channels.
To exit SRC selftest mode, press the Back⮌ button.
4.2. Determining SRC Firmware/Hardware version
To check the firmware and hardware version of the SRC module:
◆ Web
Go to the "ABOUT" Tab. The SRC firmware and hardware version are displayed on
the bottom.
◆ Front panel
Press Recall , move to ☼ Function , press OK , move to ☼ 12 , press OK
Move the cursor to
- ☼ EX to show the SRC Firmware Major Version number
- ☼ Ch to show the SRC Firmware Minor Version number
- ☼ Vol to show the SRC Hardware Version in the seven-segment display.
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4.3. SRC Firmware Upgrade
Although seldom required, the SRC firmware itself can be upgraded.
This is done similar to the multiverter upgrade, with the difference that the USB
plug has to be connected directly to the SRC (not on the multiverter).
RISK OF ELECTRIC SHOCK:
It is strongly advised to power the Multiverter from the DC
source (9..24V) during upgrade.
When powering via AC mains, it is possible to touch live
parts inside during the upgrade! Only qualified personnel must
do this, obeying the safety rules when working with live
mains voltage.
1) Switch the multiverter OFF.
2) REMOVE MAINS POWER TO AVOID ELECTRIC SHOCK!
3) Open the multiverter's top cover (see SRC manual how to do this)
4) Connect the USB jack on the SRC module to your PC (anything from Windows 7 on
should work). This is NOT the USB jack of the back on multiverter!
5) Re-connect mains power to the multiverter, and switch it ON.
6) DON'T TOUCH ANYTHING INSIDE THE MULTIVERTER - LIVE 230V WIRES INSIDE!
7) Run "SRC-64-Updater.bat" and confirm with "U". The update process takes about
1 minute. Check the screen output for any error messages. If an error occured. try
again or refer to the "Troubleshooting" section below.
8) Switch the multiverter OFF
9) REMOVE THE MAINS POWER TO AVOID ELECTRIC SHOCK!
10) Re-mount the cover
11) Check if the update was successful by verifying the SRC's firmware version (see
4.2, Determining SRC Firmware/Hardware version)
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5. SPECIFICATIONS
Parameter Value
Dimensions 115x94x27mm (BxHxD)
Weight 65 g
Operating
temperature
0..+70°C, non-condensing
Storage temperature -40..+85°C, non-condensing
Power consumption 7W max., depending on the channel count used
Channel count Flexible from 128x0 to 0x128 (in blocks of 16) when both sides run at x1
(44.1 / 48 kHz). Requires at least SRC firmware 2.0 and MVR firmware 5.0.
Up to 64x64 when either side is running at x2 speed (88.2 / 96 kHz)
Up to 32x32 when either side is running at x4 speed (176.4 / 192 kHz)
Sample rates Arbitrary sample rates between 32kHz and 192kHz
Analog performance THD+N: -133 dB typ. / -120dB max.
Dynamic range (A-weighted, 20 Hz to 20 kHz): 139 dB
Audio latency For up-sampling conversions: t/s = 16/fs_in + 32/fs_in
fs_in / kHz t / ms
44.1 1.09
48 1.03
88.2 0.54
96 0.5
176.2 0.27
For down-sampling conversions: t/s = 16/fs_in + (32/fs_in)*(fs_in/fs_out)
fs_in /
kHz
fs_out /
kHz
t / ms fs_in /
kHz
fs_out /
kHz
t / ms
48 44.1 1.06 176.4 44.1 0.82
88.2 44.1 0.91 48 0.76
48 0.84 88.2 0.45
96 44.1 0.89 96 0.42
48 0.83 192 44.1 0.81
88.2 0.53 48 0.75
88.2 0.45
96 0.42
176.4 0.26
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6. APPENDIX
6.1. Warranty
We offer a full two (2) year warranty from the date of purchase. Within this period,
we repair or exchange your device free of charge in case of any defect*. If you
experience any problems, please contact us first. We try hard to solve your problem
as soon as possible, even after the warranty period.
* Not covered by the warranty are any damages resulting out of improper use,
willful damage, normal wear-out (especially of the connectors) or connection with
incompatible devices.
6.2. Manufacturer contact
Appsys ProAudio
Rolf Eichenseher
Bullingerstr. 63 / BK241
CH-8004 Zürich
Switzerland
www.appsys.ch
info@appsys.ch
Phone: +41 43 537 28 51
Mobile: +41 76 747 07 42
6.3. Recycling
According to EU directive 2002/96/EU, electronic devices with a
crossed-out dustbin may not be disposed into normal domestic
waste.
Please return the products back for environment-friendly recycling,
we'll refund you the shipping fees.
6.4. Document Revision History
4: Added MVR-mkII, revised description
3: Revised for SRC-64 firmware 2.0 / MVR-64 firmware 5.0
2: Layout improved
1: Initial release
6.5. About this document
All trademarks mentioned in this document are property of the respective owners.
All information provided here is subject to change without prior notice.
Document Revision: 4 · 2023-09-28
Copyright © 2017-2023 Appsys ProAudio · Printed in Switzerland
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