Many types of equipment offer a choice of settings for input AC voltage, such as 110, 120, 220, 240V
Here in Australia the nominal figure is 230V so I'm wondering, if there's a choice between 220V and 240V, which is going to be kinder to our gear and why? Would some components be stressed by a lower voltage where others might be stressed by higher voltage?
There might not be a simple answer to this as supply voltages vary from place to place and time to time, so I understand there can be short term variation between 215V and 250V with grid supplies generally erring on the high side.
edit: I'm thinking mostly about long term durability rather than sound quality.
Jules