Boulder Amplifiers 1012 DAC Preamplifier - Manual (Page 10)

CONNECTING A DIGITAL SOURCE
There are four digital inputs to the DSP and D/A Converter section
of the 1012. Three inputs are the AES/EBU style. Because of the balanced
nature of these connections, it is the preferred method of connection and
should be used whenever available.
With the 1012, one DABL digital adapter is supplied and may be
plugged into any one of these inputs thus converting it to RCA phono
style SPDIF. Additional adapters are available if more than one input
needs conversion.
WARNING: In order to maintain proper impedance and level
matching, it is important to always use the DABL adapter when coming
from an unbalanced RCA phono style digital source. Do not use a
Boulder ABL analog adapter for this purpose.
The fourth connector normally supplied is toslink optical.
For possible future connections, consult your Boulder dealer.
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