Actually, Tommy's (superb) link nails it:
"So at all points in a system - analogue interconnects, PCM signals, encoded Dolby Digital - the LFE channel is "10dB too low". A 75dB SPL signal on the LFE channel will be 3 times, or 10dB, smaller than a 75dB SPL signal on the other channels. It will only sound correct when fed to an amplifier that amplifies LFE by 10dB more than it amplifies the other channels."
I knew this, but had forgotten it; hence my confusion above... honest
The LFE channel is calibrated to playback 10dB louder. The actual mix doesn't have the boost. So when played back on a properly calibrated LFE channel the 10dB is added. In a system without an LFE the processor I guess will have to add 10dB to the signal when it mixes it into the LARGE speakers...
Mark
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