robinje-
Congratulations from another northern Minnesota Salk owner(HT3s & dome Songtowers). I'm also enjoying the -10 weather, just west of Duluth!? You will enjoy your speakers-near extension of the HT3s & the magic/forgiving nature(for placement) of the TL bass. I'd personally let them warm up in the box for an hour or so...just to avoid condensation on the internal components and the finish(although I don't think it would harm the finish).
Tom