There is no "large" or "small" crossover. There are only the channel crossovers.
In my opinion, the 0.1 channel is a big mistake. Record and mix the full audio range into each channel and let the pre-pro manage the bass. I'm sure this decision was made because it was economic and practical at the time for existing theatre systems.
With regard to the "missing bass", I have my cut-off at 40Hz. The LFE below 40Hz in the 0.1 channel is routed to my sub; the LFE above 40Hz in the 0.1 channel is presumably lost which is just fine with me because frankly, it doesn't sound that great 9although others that have heard it at my place like it). How much content above 40Hz is in the 0.1 channel and not other channels is anyone's guess.
Now if you set the crossover to 80Hz, you probably won't lose much of the LFE in the 0.1 channel because sound engineers start rolling off at that frequency.
