Who turns center off when listening to music

It depends on whether the music source has a center channel in it or not.  If there is center channel info, I prefer to play it rather than delete it or split it to the L/R speakers.  If there isn't, the decision is moot.

I fooled a gentleman today who visited my home. I played some music and he thought the center channel speaker was on !

Nuff Said !! 😂

no center, no surround.  

indeed, I don't even use a center nor surround for movies or TV anymore.  two-channel works just fine w video... good enough speakers create a phantom center.

Unless your 2-channel setup is absolute shite, leave the center off.  What AVP, amp, and speakers are you using and how much flexibility do you have in placing your front L/R speakers?

I don't need to turn off any speakers. But then all my speakers have the same drivers and all amplifiers are identical, and they are all carefully balanced.

Often the center speaker is often an afterthought and the weakest, when it needs to be equal to the best.