Axiom Home Page Forums General Discussion Technical Questions Loud pops on turning on devices

Since I redid my room and have new equipment, everything except xbox is now HDMI. I even saved the mess of 6 analogs from my Oppo to play SACD through HDMI. Only concern is my VTF2 woofer gets a bad sounding pop, say when I turn on my TV even though I am listening to the Oppo, or when I go into the setup menu of my SR8002. I countered by simply lowering the volume before turning on something (hence I don't hear the pop then), but is there any reason for concern or is this normal? Hopefully by keeping the volume low this "spike" or whatever it is won't adversely affect any of my equipment. Is this due to HDMI cables?