AB-COM IPBox 250S PVR User Manual - page 16
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B. Connect the TV to the VCR with RCA cable
Connect one end of RCA (RED: Audio right, White: Audio left, and Yellow: Video) to
STB and the other end of RCA to the TV.
8.1.3 Additional audio connection with Hi-Fi system
Connect one end of RCA stereo cable to the 'AUDIO L/ R' outputs on the STB and the other
end of RCA cable to the Audio L/R inputs on the Hi-Fi system.