Opinion wanted

Currently using a few in-wall RPi 7" touchscreens with HiFiBerry DAC RCA running Kodi/LibreELEC, all works fine until splitting audio out to multiple receivers using some Y cables. Receivers are all in one cabinet. 

Was going to order the Rolls DA134 four channel distribution amplifier x3 @ $100, because it uses RCA, but wanted to ask if I'd have better sound if I replace RCA DAC's with DiGi spdif boards since my receivers all have multiple spdif in/out.  

Just 3 Pi screens would get the DiGi boards as they handle whole house audio. (No issue running new spdif/fiber, 15-20 feet max distance).

Do DiGi boards require additional power/wall wart?



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