BiWire Jumpers on biwireable speakers.

[BoyScout]

But there's also the personal reasons. Mood is one of them. 

That's a big one! 

That means we can 'hear' differently depending on how we feel.

That´s why!
I wondered how it was possible to notice a difference between those two types of connection, and here´s the reason: my mood changed every time I got up to change the terminals.
Much more enlightened now ... and relieved.