PS4 is the loudest console I ever owned.
So you didn't own a 360?
Xbox 360
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Startup (from cold) - 56dB,
Startup Idle (30 sec sampling) - min < 50dB, peak 51dB
Drive Loading - peak 60dB
Extended Idle (1 hour running) - peak 61dB! (no drive! Just fans)
PS3
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Startup (from cold) - 50dB
Startup Idle - min < 50db, peak < 50db
Drive Loading - peak 50dB
Extended Idle (1 hour running) - peak 53dB (no drive, just fans)