I am having an issue with my my Technics SA-AX6/SH-AC500D setup. When I initially turn on my TV and then my receiver and digital sound processor I get a lot of popping coming from my speakers. I have to keep adjusting the overall output level on the digital processor until the problem finally goes away. This issue only occurs at start-up. Once the system has been on the problem never occurs again. If I turn everything off and come back later in the day it will repeat the same issue. It seems to primarily happen on digital input 1 that is connected to my Tivo box via an optical cable. It only happens when I am connected to a digital souce. This never happen when I use the tuner to listen to the radio. Any thoughts on what could be causing the issue?