Do you Bi-Wire, if you can?

I have one pair of speakers that allow biwire. Although I have done it in the past, I couldn't hear any difference. Now that I'm 61-years-old I wouldn't bother listening for a difference so I no longer biwire.
My other two pairs of speakers only allow single wire connection.

Yes. I have Vandersten 5s which are equipped for biwire. Richard Vandersteen is very deliberate about his design and backs it up with rational explanations. I have spoken with him and find him to be a man of both integrity and common sense, so I've never run them any other way.

My Daedalus Ulysses speakers cannot be biwired. Presumably Lou Hinkley doesn't want users to be tinkering with the sound he has worked so hard to achieve. I believe that in the past I've only owned one pair of speakers that could be biwired, many years ago, and I used them single-wired.

Best regards,
-- Al

I have bi wired in the past. Now I single wire with good jumpers. It works out better that way for me

YMMV

Mostly do not believe in the whole bi-wire syndrome unless the speaker has been specifically designed for it. And I circumvent jumpers by simply using a single wire bridging the same plus/minus termination if possible.

I've even done surgery on some bi-wire designs and internally bridged the terminals with positive effect.

Read Israel Blume of Coincident speakers take on it all.