There is no corrolation between the two. Setting your speakers to small is an LFE setup. It means that when you set them to small, you are using a subwoofer for those particular channels for the bass energy. Speaker gauge should be determined by the length of the speaker wire used. Normally, we use 16 gauge wire. If however, your speaker wire lengths are quite long, you may need to use 14 or even 12 gauge wire.