Kurzweil DMT interface, User Manual, Page: 10 / 44

DMTi 10
You can easily make an adaptor to bring S/PDIF signals into the
DMTi
’s AES/
EBU inputs. The shield of the RCA connector is wired to pins 1 and 3 of the
XLR connector, and the center (hot) conductor of the RCA connector is wired
to pin 2 of the XLR. Here’s a diagram of such an adaptor:
1
2
3
To AES In (solder side)
From S/PDIF Out
Generally speaking, when sending a digital audio signal to an S/PDIF device,
the
Output Format switch for that signal should be set to “ Cnsmr ”. Also note
that S/PDIF signals sometimes have trouble travelling long distances. Using
high-quality video-compatible coaxial cable and making cable runs as short as
possible will keep problems to a minimum.
The signal at the AES/EBU outputs, however, is at the higher level required by
AES/EBU devices, and it is possible, although unlikely, that the input on an
S/PDIF device could be damaged if it is connected directly to one of these
outputs. An attenuating adapter can avoid this problem. If you are in doubt,
check with the manufacturer of the S/PDIF equipment to see if it can handle
the elevated signal level. To make an attenuating adapter, insert an 82.5
Ω
resistor between pin 2 of the XLR connector and the center conductor of the
coaxial cable, and connect a 750
Ω
resistor from pin 3 of the XLR connector to
the center conductor of the coaxial cable:
1
3
2
From AES Out (solder side)
To S/PDIF In
82.5
Ω
750
Ω
1
3
2
From AES Out
(solder side)
To S/PDIF In
A similar adapter can be used to send AES/EBU signals from the DMTi to an
S/PDIF device: