As long as it truly works properly (only high-pass to the mains, the LFE & the bass from all the other channels to sub) then 80 hz would be fine. But better still would be adding the ability to set the bass level for each source individually as opposed to one global setting for all MC stuff. In other words, I'd love to be able to set the bass one way for SACD, another for DVD-A, another for DD/DTS. Certainly the player recognizes what it's playing, so adding this feature wouldn't be difficult for the designers. Of course, the menu could allow one global setting for those who don't wish to tweak.