I agree with Craig. Any precision instrument should not be allowed to experience such extremes of temperature. Materials contract and expand based on temperatures and condensation can form in unconditioned environments. This expansion and contraction can damage components.
Any harm in leaving gear in the cold?
I use a Carver receiver and Pioneer six-disc player, along with some Mirage Oasis outdoor speakers, in a pool side system. The receiver and cd player reside in an enclosed, unheated shed. During the Canadian winters, the temperature can dip to well below zero. Since all components (integrated circuits, caps) are specified to operate 0C to 70C, and have a storage temperature of -40C to +85C, is there any harm in leaving the gear in the shed over the winter? If I unplug the stuff, any harm done?