There is no such thing as a “sealed” amp. At best, a top panel might have a bit of foam to damp it a tad from vibration. Otherwise, any moisture will be present. It certainly isn’t necessary to open anything up, and I highly doubt the conversion of moisture would result in a dripping amp. But as mentioned, it’s just a smart thing to do to wait. This is assuming the amp was below say 40° or so. Much warmer and it is doubtful it would be an issue. Sub freezing? Without doubt let it warm up for a couple of hours. No worries.
starting equiment that ic cold from being shipped
Is it a real thing that you court problems if you turn on an ice cold amplifier or pre-amp without waiting 24 hours for temperature to rise. I have long awaited Krell FPB and KCT shipping tomorrow, It's single digits in the Midwet. Should I wait a full 24 hours for the equipment to warm inside before introducing any electricity into the components?