ISO-PLUS Ethernet RF Filters vs Fiber Optic Cable

Hi,

I'm trying to send a clean internet signal into my DAC to eliminate some of the noise the DAC has to filter.  I am currently using the DX Engineering ISO-PLUS Ethernet RF Filters on the ethernet cable between the internet switch and the Bridge II card on a PS Audio DirectStream DAC.  I wanted to know if it would be better to use fiber optic cable instead of the RF filters.

Using the fiber optic cable would cause me to add two wall warts, and have the EMI problems that that come with them.  The RF filters don't require electricity, so I don't have those EMI problems with them.

Please let me know what you think.  

Thanks,

Alan