Originally Posted by Serge
Cinema
The Cinema preset is recommended for listening to multichannel movie soundtracks when no further processing is required.

Discrete
The Discrete preset is similar to Cinema, except that it uses the
Music speaker layout and sets the LFE level to -10dB.

Meridian has choose the exact oppposite way to manage the LFE level in the case of an 5.1 analog input.
I wouldn't say that, but it is confusing. My understanding is that with movies (Cinema preset), Meridian boosts LFE by 10dB, but reports it as 0dB (which is the correct thing to do), because, to allow an extra 10dB of volume, the LFE movie channel is recorded at -10dB vs. the other channels. With music (Discrete preset), that boost is not applied as it is assumed that the LFE channel in the recording is at the correct level with respect to the other channels.

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The management of the level in the player is just there to calibrate the speakers not to compensate the level differences between each sound format. This why it is not possible to add +15db on the LFE channel in the player (and the +15db is needed if you choose to do the bass management in the player)
You are correct in that Meridian doesn't provide a means to compensate for players that attenuate the analogue sub channel. However, you said earlier that
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The OPPO outputs analog LFE -10db when speakers are set to large and -15db when any speakers are set to small.
So you only need +10dB of trim (which the Oppo can do) if you set all speakers to large in the Oppo (which turns off bass management in the player).

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