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Join Date: Jan 2001
Location: upstate NY
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As gregzoll mentioned, you need to keep electronic equipment in a climate-controlled environment unless it is intentionally designed for outdoor use.
Temperature fluctuations cause the parts in the receiver to expand and contract. Different materials change size at different rates. This causes connections to physically break apart.
High temperature and humidity cause the parts in the receiver to corrode more rapidly. Oxides in the connections can cause them to become electrically disconnected.
Edited to add:
Getting water into dusty equipment is a disaster, too. That'll happen when humidity condenses onto cold surfaces after a long winter night.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped