RME Audio ADI-2 DAC, Руководство пользователя

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60 User’s Guide ADI-2 DAC © RME
31.13 Operation in the Hi-Fi Environment
Do the advantages of the ADI-2 DAC's fully symmetrical design still exist when using
unbalanced connections (RCA)?
Yes. On the output side RME uses a specially developed servo-balanced DAC filter, which pro-
vides both paths of the balanced design with full noise and distortion ratios. Therefore the tech-
nical specifications are reached even if the balanced XLR output is used unbalanced, discon-
necting one pin - the required signal optimization is already done in the unit. At the RCA output
an additional conversion balanced to unbalanced is performed directly at the output. These
efforts guarantee the supreme sound quality of the ADI-2 DAC to be available in all operation
and connection scenarios.
Which level setting is recommended?
There are a total of four hardware reference levels available, with the XLR output having a 6 dB
higher level. With Hi-Fi the s7 dBu (4.78 dBV or 1.73 V RMS) is recommended.
This setting causes an ADI-2 DAC to output level similar to that of many CD-players. In case it
is still too low simply change to +13 dBu (+10.8 dBV, 3.46 V RMS).
Doesn't a low hardware reference level cause a significant increase in noise?
Usually yes - but not with the ADI-2 DAC. Switching the reference levels is done in the analog
domain, in hardware. The circuit has been optimized for maximum signal to noise ratio even at
the lowest reference level, -5 dBu. Detailed values can be found in chapter 30.2.