M2TECH HiFace User Manual download pdf (Page 21)

ace

192

/24bit digital audio interface

REVISION 1.o – NOVEMBER 2010

M2Tech

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7. Interface special features

7.1. Output voltage

hiFace has an output voltage which is not compliant with te S/PDIF standard (1.75Vpp

instead of 0,5Vpp on 75 Ohms load). This is a choice made to increase the drive capability

with long digital cables. Please contact your local distributor/dealer in the unlikely event the

output voltage is excessive for your DAC’s input stage.

7.2. Sampling frequency coding in the bitstream

S/PDIF standard requires that some information are encoded in the S/PDIF data stream.

Amongst them, the sampling frequency must be indicated. hiFace doesn’t comply to this

requirement. This feature leads normally to no problem. However, some DAC’s use those

information to display the music’s sampling frequency on the front panel. When using

hiFace with such equipment, the sampling frequency indication always remains on

“48kHz”, even if the DAC is correctly converting 44.1, 96 or 192kHz bitstreams. User

shouldn’t be fooled by this indication and refer to the sampling frequency information

displayed by the player on the computer.

7.3. Output connector choice

hiFace comes in two different versions: with RCA output connector and with 75 Ohms

BNC connector. Which one to choose? It mainly depends on the input connector on your

DAC or A/V receiver. Most units have an RCA input connector, so the RCA hiFace is to be

chosen. On the other hand, some high performance units have both RCA and BNC input

connectors, and some of them only have BNC inputs. The rule is: every time a BNC

connector is available, hiFace BNC should be chosen, as the BNC connection, being it a

true 75 Ohms link, give slightly better performance.

Should a hybrid cable be available (that is, a cable with an RCA plug on one end and a

BNC plug on the other), it is possible to use a hiFace BNC with a DAC provided with an

RCA input, or vice versa. A slight performance increase with respect to an all-RCA link can

be obtained.

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M2TECH HiFace User Manual Page 21