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Ok, let me refresh my memory and review this LFE bug.
The LFE is 5 dB too low via PCM over HDMI. The -5dB is in comparison to all other audio, including other low bass content that isn't in the LFE signal? (I am sure there is low bass music not in the LFE)
This means that all LFE audio will be lower than other audio including any other low bass audio not in the LFE and there is no way to adjust only the LFE audio without affecting other low bass audio? So adjusting your subwoofer level in the receiver or on the subwoofer volume control changes both the LFE and other low bass audio headed for the subwoofer, so you still have a -5 dB discrepency between LFE and other audio like other low bass, and the rest of the frequency range too?
Does this only happen with some speakers set to small? ...or is there low bass other than LFE going to my subwoofer when I set all my speakers to large? I guess it depends on the receiver. (This is the part where I wonder if some discs have music or other audio that goes down low in bass, and will be played by a subwoofer, but this audio isn't in the LFE channel)
If there was one simple thing Panasonic could do to solve this, it would be to have an adjustment available in the Blu-Ray players themselves from -10 dB to +10 dB for the LFE alone. Everybody calibrates their own setups using the players adjustments and Problem solved.