i have crossover set at 80hz all bass below that goes to sub the rs6 are good but i would not class them as full range speakers no matter how good speakers are they cannot produce low frequencies as good as sub.this is just my opinon other people have different set ups i have tried different set ups and i find setting the speakers to large plus sub produces to much heavy bass,dts soundtracks go well below 40hz where that does sound go when your speaker can only handle frequencies to 40hz,when you have speakers set to large and sub plus ,all low frequencies going to large and sub but the large speakers cannot handle these low frequencies where are they going ?nowhere i find by selecting speakers to small across the range and a crossover of 60 or 80hz which means all low freq below that now goes to sub i find that this gives better sound across the range and greater impact to movie soundtracks.a lot of people have the idea that because they have floorstanders they should be set to large not so the setting of large and small should be determined by freguency range of speakers,sometimes manufacturers have been known to be generous it might be worth adding on 10hz to there spec for example if range is 40hz to 3khz it might be better to set crossover at 60hz or so,unless you can measure it with a sound meter,every individual has different set ups and rooms i suppose it is what sounds best to you,i usually change settings to large for listening to music i would like to hear peoples opinon on this.