No idea which reference you're referring to(there are many) but I'll assume THX. Which is up to 105dB maximum per channel.I’m talking about reference level not 100db. Who listens at 100db??
You can EQ up the low bass on the R11 if you want it to "dig deeper". It can probably do 85dB at 20hz without too much trouble. And definitely more than this can at 30-100hz.Yes there is limitation of loudness but at ref level they dig deeper than r11.
All that said, the LS60 has good bass for most music listening. HT levels aren't too relevant since you always need subs for that.