What is the most important component in your system.


To me it is my ARC Ref 6 preamp. I have used a few other preamps, ML38s , ARC Ref 5se,  with my current system and none has taking me closer to music then my ARC Ref 6 preamp. Years ago I always thought it was my B&W 800 Matrix speakers and then my Krell FBB amp. But found out that to get the best sound from my 800s it is a preamp..Years ago i never knew how important a good preamp was in reproducing music. And sure everything adds up ,like interconnects , power cables , speaker cables, platforms and all those tweaks that we use and try. Now i not saying that i was never happy with my 800s and Krell or even my ML 38s. But adding my current preamp really makes my other components bring out their best. 
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While I’ve learned that a preamp can make or break a system, I am reluctant to say any one component is most important. I do think the key is a well balanced system. 
It all starts and stops with power per channel for me. My AudioControl Pantages 230W x 5 amp is the heart of my system and the Sunfire Theater Grand TGP-5 Processor is the brains so I guess the lungs of my system are my Athena AS-F2s L/R mains (a), psb500s L/R mains (b), EMP es1010i sub, B&W V201s L/R front highs, Martin Logan Vignette Center, Jamo 7.4s surround and finally Boston Acoustics a100s surround back. Yeah I know no timber matching happening but I’d employ anyone to sit and tell me they can hear that they don’t match. The sunfire does a great job of calibrating everything.
Definitely my First sound upgraded-to-the-hilt(Deuland caps, Vishay resistors) pre amp. Less is usually more in the signal path as, no doubt, everything adds color and /or a characteristic to the sound and is usually a negative but in this instance this pre amp  definitely contributes an overall improvement to the sound.