Tony,
Back when I bought a 5900, I also bought a 8k pre/pro amp combo to try out multi channel hi rez and made 3 more custom speakers whith Scan speak drivers and all the best parts.
It turned out that after spending over 14k, I preffered most hi rez in 2 channel and ended up with overkill surround H/T speakers.
As far as the hi rez surround control goes, I am probably not the best person to answer this, but you can control over analog, speaker size and distance, and if you use the small setting, your stuck whith 80hz.
Don't know anything about how these settings work whith I link either.
Back when I bought a 5900, I also bought a 8k pre/pro amp combo to try out multi channel hi rez and made 3 more custom speakers whith Scan speak drivers and all the best parts.
It turned out that after spending over 14k, I preffered most hi rez in 2 channel and ended up with overkill surround H/T speakers.
As far as the hi rez surround control goes, I am probably not the best person to answer this, but you can control over analog, speaker size and distance, and if you use the small setting, your stuck whith 80hz.
Don't know anything about how these settings work whith I link either.