starting equiment that ic cold from being shipped

Opening them up to warm up is a terrible idea. This will expose the electronics to any water vapor in the room and greatly greatly increase the likelihood of condensation forming. Leaving them sealed more or less restricts the opportunity for condensation to any water vapor present at the time of shipment from the factory - condensation that would have already formed as the unit cooled during shipment.  However, I am guessing the manufacture likely packs the equipment with desiccant that absorbs all water vapor present at packing and prevents condensation. However, the desiccant won’t work quickly enough to prevent condensation from an entire room full of water vapor. Keep it sealed and be patient for 24 hours.
 

FYI - my day job is Chemical Engineer. 
 

Matt

@dekay ​​@holmz  - I feel bad. I meant no disrespect when I said opening them was a “terrible idea”.  It was an in-artful way to open my response and I don’t want to promote discord on this site.
 

I do stand by my opinion that it will be better to leave the box sealed to warm up. 
 

Matt

I have personally been in the same situation, frigid amp, and went one more step

and put it a garbage bag and sealed it and YES waited four days which is when it felt like room temp.

barts hates moisture and electronics agree...

Regards,

barts

Unless my heat-seeking moisture missile is doing the talkin'...

Regards,

barts

@Bossa

By the way modern double pane insulated windows should prevent moisture from condensing on the interior pane because the argon gas in between the panes of glass stop the cold air from hitting the interior pane. Thus no condensation. Old school single pane windows would without exception have moisture on them from condensation in the cold months. This happens even with low humidity rooms. So, to be safe I would wait on plugging in and playing any audio equipment that could potentially cause condensation.