Usage; Analog To Digital - RME Audio ADI-1 User Manual

6. Usage

6.1 Analog to Digital

Connect your analog signal source with the ADI's XLR or TRS input jacks. First adjust the
knobs fully counter clockwise and try to achieve an optimal input level by toggling the 'operating
level' switch. Fine adjusting the input level can easily be done by watching the level meter while
turning the knobs. The best input level is present when all LEDs except the Over LEDs are lit at
the loudest parts of the signal.
The highest signal to noise ratio is achieved by turning the knobs fully counter clockwise (0).
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Whenever possible the level of the source itself should be adjusted (for example when a mi-
xing desk is used).
The analog inputs use Neutrik's combi jack, thus providing XLR- and 1/4" TRS jacks, both use-
able in balanced or unbalanced mode. The input stage is built in a servo balanced design that
handles monaural and stereo jacks correctly. When used unbalanced it automatically corrects
the gain by 6 dB.
Adapting the working level to the most common values, +4 dBu and -10 dBV, is done by pushing
a switch on the rear panel. The potentiometers on the front panel provide additional 20 dB of
gain variation.
The desired sample frequency of the AD-converter is set to 32 kHz, 44,1 kHz and 48 kHz by
pushing the switch 'Sample Frequency' on the front panel several times.
When using unbalanced cables with XLR jacks we recommend to short pin 3 of the cable's jack
to pin 1 (ground). Otherwise noise may occur, caused by the unconnected negative input of the
ADI-1's input jack.
At the cinch and optical digital output a SPDIF signal with channel status Consumer is available.
Connecting the output to professional devices using their XLR inputs (AES/EBU) requires a
cable adapter cinch/XLR, please ask your local dealer. Some professional devices don't accept
Consumer format at their professional inputs at all and won't accept the digital signal from the
ADI-1.
Transferring digital data into a PCI bus equipped computer is best done using RME's digital in-
terface cards of the DIGI96 Series. These cards with highest reputation are the ultimate solution
for master and multitrack tasks. Drivers are available for Windows 95/98 and NT, MacOS, and
shortly for Linux, Unix, Solaris and BeOS.
User's Guide ADI-1 © RME
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