ART Pro Audio Digital MPA-II - Two Ch. Mic Pre w/ A/D Conversion User Manual
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Using the optical output in S/PDIF is recommended over the coax output, as it is the most robust and
reliable of all the digital outputs.
S/PDIF output
The S/PDIF coax connector allows the DIGITAL MPA II to connect to a wide range of consumer and
professional equipment. This output is .5V p-p (when connected) isolated from ground, and has a 75
Ohm impedance. The same data is sent to both this connector and the AES/EBU output, but it is
recommended that you not use both at the same time, as the AES/EBU output may work, but there
will be too great a loss in level to meet the S/PDIF spec.
AES/EBU output
The AES/EBU output of the DIGITAL MPA II is a 5V p-p signal with a 110 Ohm impedance. This
cannon connector is driven by the same drive circuitry and isolation transformer and as the S/PDIF
output.