SONOSAX
Audio equipment manufacturer
SAS S.A.
Ch. de la Naz 38
CH-1052 Le Mont-sur-Lausanne
Switzerland
Tel +41 21 651 01 01
email sonosax@sonosax.ch
website www.sonosax.ch
T E C H N I C A L N O T E
SX-R4+
SD CARD TESTING PROCEDURE
Document revision 1.0, April 2019
SD card testing procedure to ensure seamless recordings
Format your SD card while inserted the recorder using exclusively the SX-R4+ formatting
utility in the SD card menu.
Prepare a specific configuration to test your SD Cards as below:
• Route an input to all 16 tracks such as XLR1 to all tracks (no need to feed any
audio signal)
• Arm all 16 tracks
• Turn the Generator ON in the Output menu (any level can be chosen) and check
that all tracks display the modulation level
• If you wish to test both cards at the same time, make sure the “SD2 Rec Tracks” is
set to MIRROR
• Set the sampling freq to 96k and a pre-record time of 4 seconds
• On the main screen check the two orange bars just under each of the SD1 and
SD2 cards remaining time indicator, these two bars indicate by how much the
internal RAM buffer is filled
Start recording and witness these two orange bars, they must drop rapidly to almost to
zero as soon as the recording has started, indicating that the RAM buffer is flushing
correctly.
• A bar staying high or continuously raising indicate that the SD card is two slow for
that particular setting
• A bar raising high occasionally, then dropping again may indicate that the SD card
may have some issues
Continue recording until the SD Card is full, at which point the recorder will stop
automatically. If the recording stop earlier and the SPEED warning is flashing, then your
SD card is too slow for that setting. It usually happens within a minute after the recording
has started. If this happen later at any moment, then one can assume that the card is slow
in writing on some sectors.
Testing your cards for 192kHz recordings
Once your SD Cards have successfully passed the test described above, reformat them
and then set the sampling frequency to 192kHz.
The maximum number of tracks that can be safely and seamlessly recorded at 192kHz
may vary from 8 to 12 tracks depending on your SD cards.
The number of recordable tracks decreases when using both cards simultaneously,
therefore use only one card at a time to record a higher count of tracks @ 192kHz.
To check the maximum number of tracks your SD Cards is capable to record, use the
same procedure as above but arming 8 tracks only. Check that the RAM buffer is flushing
properly, then successively increase the number of armed track by 1 until the RAM buffer
no longer flushes, which will lead to a SPEED error. At this point you know that the
maximum number of track is one count below the SPEED error.
SX-R4+ SD card testing procedure 1/1
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