Why do you think Bi-Wiring improves the sound ?

Not a fan. 

Some years back I had speakers that could be bi-wired or bi- amped. 
    The only advantage I see now from bi- wiring is you will already own the wire if you decide to Bi-amp,Which I eventually did do.If that isn't a future consideration, don't bother. The money is better spent on upstream components, not wire or speaker mods. 

interesting take... https://www.qacoustics.co.uk/blog/2016/06/08/bi-wiring-speakers-exploration-benefits/

I have always bi-wired my speakers.
The concept makes perfect sense if you consider that the voicecoil is kinda like an electric motor.
Give it power and it goes.
but an electric motor is also an electric generator if the movement is caused by an exterior force.
The driver doesn't comes to rest instantaneously after being driven by the amplifier.
momentum keeps it going and that can cause the creation of current which feeds back to the tweeter. potentially.
Bi-wiring gives this current a place to go as it is drawn to the ground of the amplifier.
Path of least resistance and all that.

It all depends on your listening preferences like a new cart, or a new set of speakers. I am enjoying my "bi-wirging" experience. Some music sounds more open to me bc my ears are different than anyone elses. Good luck with your search bc it's your search, and it's awesome that it's your search alone