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I'm not sure what happens when you set the subwoofer to off. Either the information is lost, or it is sent to the main speakers. Can someone chime in here? Is this potentially bad for the main speakers as they can't produce super-low freqencies?
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of course, most receivers, if they manage bass properly, redirect the LFE to the mains in this situation. is it potentially bad? i guess if the receiver's volume is set too loudly already, then the really low note could, potentially, do more damage to a speaker than another note that's not as low. but generally, no. speakers have a natural roll-off designed into them and if a note is too low, the speaker does what it can, otherwise just doesn't play it.
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That's not how I understand large/small works.
The LFE channel is always directed to the sub.
When you set the speakers to large, nothing is re-directed.
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with an "LFE+Main"-type (or similar) subwoofer setting in the receiver (and many receivers have this sort of setting), redundant low bass information IS sent to the subwoofer. this is generally not desirable, but probably works for many people because their mains are not truly full-range speakers, and are rolling-off through the low bass region, therefore diminishing the redundancy. many people like the "thump" this setting can add to their music versus running their mains as SMALL. but an "LFE+Main"-type setting with mains that can truly go down to, say 30Hz or lower, would sound very bassy in almost all but the hairiest of situations.
and there are other, "less conventional" ways to get the low frequency bass and/or LFE into BOTH the sub AND mains, too. such as connecting a sub to a receiver's front pre-outs instead of the sub-out, running the receiver set up with no sub, and utilizing the sub's low-pass filter, for example.
(ok, sheesh, time to quit editing this post.)