Originally Posted by PolarWeasel
If I understand things correctly *now*, I appear to have three options if I want to do this the Right Way:
1) Adjust the output level on my subwoofer +10 dB when I listen to the BDP-83's analog outputs and back to +0 dB when I listen to other sources.
2) Connect one subwoofer to my receiver. Connect a second subwoofer (powered, with a line-level input) to my BDP-83 and configure it with +10 dB of gain in the final amplification stage.
3) Buy a new receiver that can apply 10 dB of gain to the analog subwoofer input.
I have the exact same problem, as I have a Denon AVR-4800 and also use the ICBM for base management. I have been thinking about this problem, and may have a better alternative (without having to buy another subwoofer or receiver):
1) Adjust the channel trim in your receiver such that the subwoofer is -10 dB below the mains and recalibrate with a sound meter using the internal test tones (you will need to increase the subwoofer amplifier gain). This setup should still be correct for Dolby Digital/DTS audio sources decoded in your receiver.
2) Set all of the LFE controls on the ICBM to nominal (0 dB), and set all speakers in the BDP-83 setup to "Large".
3) Ideally, you would like to set the channel trim levels on the BDP-83 to the same values you used in your receiver setup, except that the subwoofer trim level will now be the same as the mains (10 dB higher than in step #1). You can use the audio test tones on the DVE Blu-ray disc to verify the speaker trim settings for the BDP-83, and hopefully they will be close (within a dB or so) to your receiver settings (but this is not necessarily critical). Anyway, since the analog inputs on your receiver are basically just a pass-through (no channel trim is applied), the LFE input to your receiver from the BDP-83 will be the standard -10 dB low, and will be amplified another 10 dB by the subwoofer amplifier. This places the LFE amplification at the proper point in the gain chain.
This setup should be correct for both audio sources decoded by your receiver and the analog outputs from the BDP-83. I have verified this configuration using the analog outputs on my Panasonic DMP-BD55, and it appears to work as desired. Let me know what you think.