Help with Loud Pop in Denon AVR


Good People:
My older Denon AVR 4803 makes a very loud pop when turned on and off. It's connected to a cable receiver (via optical) and CDP (via digital coax). The AVR otherwise sounds and functions OK. Since the kids use it constantly, it's really annoying--any easy fix?
loomisjohnson
If there is a headphone jack that turns the speakers off when a plug is inserted you can buy a 1/4 inch phone plug and insert it when powering on or off. A 1/4" to 1/8" headphone adapter would also work and be less bulky.
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