Heart, Lungs, Brains, Veins, Liver


What would you label your components if they were heart, lungs, brains, and veins, liver,  Lets just go with speakers, amp, preamp, [cd player - record player ]. [speaker cables and interconnects ]. 
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All right, I'll take a stab at it. The lungs are obviously the speakers, the veins the cabling, the heart the power amp, the brain the sources, which leaves only the liver to be the pre.
I'm thinking the liver would be whatever component wears out the quickest. 
The pre-amp is the Heart of any system. Start your system building here.
Happy Listening!
Well if the speakers are the lungs then the lower intestine and colon must be the subwoofer.
But I think the amp is the heart and the pre amp is the brain. 
Ears -antenna
liver-a/c conditioner
vascular-cables
feet-isolation
bones-rack
fingerss-remote
can’t figure what can be the source organs

I am jumping off here