Can I connect my digital SAM-monitors to S/PDIF directly?
SAM-series can be connected to a SPDIF directly, with noticing some limitations.
To connect Genelec Digital (SAM) monitors to audio source S/PDIF connector, it is recommended to use Digital cable with specification below:
Characteristic impedance: 110 Ω
Cable type: Twisted pair cable intended for AES-EBU digital audio transmission
Connectors: XLR (male) - XLR (female)
As this cable is XLR-XLR cable, you would also need an simple XLR-RCA adapter to get the cable connected to the SPDIF connector in your sound source.
The S/PDIF signal voltage is a fraction of that in the AES/EBU. Also, S/PDIF is not a differential transmission line, making it more prone to external disturbance. S/PDIF has not been designed for long distances in the same ways as the AES/EBU link has. We recommend to keep the cable lenght less than 8 meter when using 110Ω cable.
What is the best method to connect SAM-monitors to S/PDIF?
To use Genelec Digital monitors with S/PDIF input signals, best method is to use impedance matching converters (available for example from Neutrik) and short cable lengths because the S/PDIF link is not designed to travel long distances. The Neutrik converter takes care of the fact that the terminating impedance of S/PDIF is 75 ohms and that of AES/EBU is 110 ohms. This is the most robust solution to connect our SAM-monitors directly to S/PDIF.
It is advisable to use the GLM software if you do this because GLM will then work as the volume control for the whole system (note that some source can control their S/PDIF outputs and some cannot). This means a GLM should be connected to the system.
GLM can also be used in "stand alone mode" without the software opening. Please refer to GLM Operating Manual for more information.
(Tags: SPDIF, 8330,8340,8350,8351,8341,8331,8361,1237,1238,1236)