I agree with Craig and bugbitten.

Personally, I run my 60's small with the sub, because I am just too damn lazy to press those extra buttons to reconfigure stuff all the damn time. Unfortunately, my receiver doesn't cross over lower than 80Hz; from the small amount of experimentation I was able to manage, I very strongly suspect I would adopt Rick's recommendation of 60Hz if I had that as an option.

bibere usque ad hilaritatem