My receiver (Yamaha RX-V1200) allows you to choose "both" when you have the mains set to large. The description for both is "Select this if you use a subwoofer and you want to mix the main channel low-frequency signals with the LFE signals." I'm not quite sure how to interpret this. Does this mean that the mains will receive the full range of LFE signals that they are capable of receiving and that these same signals will also be sent to the sub? My mains go down to 37HZ and the sub goes down to 25HZ. Are my mains and the sub both receiving bass signals down to 37HZ if I select "both"? If so, are there any drawbacks to using sending signals to "both"?