A Ghost in the System? Music Thru Speakers with Preamp Disconnected


I disconnected my preamp yesterday completely from my system in order to install some constrained layer damping tape.  The DAC was on and receiving music, but the signal chain between the power amp and the dac was completely broken due to the preamp being removed.  BUT:  I could hear very low volume, but very clear, music playing thru the speakers!  And no, I was not intoxicated.  How is this possible?  Cool stuff.  Thanks.
tomask6
Stuff like this happens all the time. For some reason though it tends not to be reported until April 1st.
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Granted it is not easy to tell the April Fool’s from the normal everyday variety. I have to work very hard at it. One even has a whole entire website, a veritable shrine, the Las Vegas of Fool’s. But I can’t complain. At least not today. The other 364 days though....
This reminded me of something that really truly happens with my system. I don’t think it matters but I have a Denon AVR 4806 ~10 yrs old & we have outside speakers.  Although no one is allowed to touch it, once a yr sound starts coming out of the outside volume switch. It’s very faint & you can feel the switch plate vibrating a little.  A call to my stereo store & after some... push that, turn that switch all the way to the right & then flip that toggle down twice & once up... its gone. So, can some kind circuit  or set of wires, in the volume switch, vibrate when you “cross the streams” & cause that sound?  It’s usually the radio or what I’m trying to play outside from my iTv iTunes.