With a "large" setting, a crossover for the mains is generally unavailable and they play full-range. If no sub is in use they also play any LFE that is occasionally present during movies. The large setting also makes the LFE+Mains(or Plus, Double, etc.)setting available when a sub is used. The sub then plays any LFE by itself and also plays any bass in the mains channels below the mains crossover set simultaneously with the main speakers.