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LFE digital output from players
When outputting a Dolby Digital or DTS bitstream from a player, the LFE channel remains encoded in the bitstream, untouched by the player. The receiver's decoder has the responsibility to boost the LFE by 10dB, and almost invariably they will get this right. DD and DTS remain the most foolproof way of transmitting LFE.
When outputting a PCM multichannel bitstream over Denon Link, i.Link, HDMI or similar, the LFE channel will be transmitted "as-is", and will need boosting by 10dB in the receiver. The receiver should do this automatically. If it fails to do this before performing bass management, then you will be unable to calibrate the system correctly - boosting the subwoofer to compensate will have the side effect of over-emphasising bass from other channels.