So i just recently bought a Denon AVR-S910 and im slowly trying to build my audio equipment up. I just received the unit a few days ago. I don't YET have speakers hooked up (thats my next purchase). However i have my samsung uhd tv from the tv's HDMI (ARC) hooked up to the the receiver's HDMI (ARC) port. Eventhough i dont have surround sound speakers yet i figure i would go ahead and hook it up that way since i was getting speakers and I have a harmony elite remote and i wouldnt have to reprogram an activity. Anyway, when my receiver is on, the volume is significantly lower then when the receiver is off and im just using the passthrough. Is that normal? I've only noticed it when watching cable. I haven't noticed it when watching the fire tv.