in the cited article, mr. florian talks about "throwing everything between [x-over point of the sub] and 120hz of the lfe channel away." but, just before that, he says that thx has determined that the vast majority of soundtracks contain basically nothing between 80hz and 120hz because of the brick wall at 120hz. so, in reality, you are "throwing away" only between the sub x-over point and 80hz.

as i've said before, the better standard for speaker placement is the itu standard, included in which is the requirement for all 5 speakers to be identical and full range.

having a full range tower on your tv is not practical for ctr. ch so, adding a small sub to the center speaker is a simple solution.
(i'm using an 8", front firing, ported, powered sub with high pass into the center channel amp...cheap 100 watt sub and works nicely). l, r, ls, rs, should be identical and full range.

set all speakers to large, and set the sub x-over to 70hz and dial-in from there. don't trust your speaker man. specs as to low end response. use the autosound disc, but either way, start your sub at 70hz and adjust the x-over and phase from there.

finally, with a test disc and meter, use a parametric eq to tame any bump in response.

this is the best setup and won't have to be tweaked much between HT and multichannel sacd/dvd-a. (unless you buy a chesky disc)

also, don't discount speaker placement and delay settings. small tweaks here yield big results. i tell you, it's worth the effort to set up this way and tweak to perfection. the sacd discs i've mentioned elsewhere in the forum truly sound amazing and i basically need no adjustment to switch to HT other than the phase issue kcb brought up, which i am currently investigating in my setup.

and...multiple x-over settings, summed and sent to the sub DO cause phasing problems that can't easily be dealt with. thx, by the book, or itu, by the book. everything else doesn't work as well. i like itu better...by far, for HT and music, but...you decide.