Biwiring make any sense?

What about biwiring with silver for High frequencies and copper for low frequencies ?

I do this with AudioQuest KE-4 (15 AWG pure solid silver) up top and Mont Blanc (12 AWG solid copper) on bottom. Used to use this in my main rig, and now brought it back in my 2nd rig. Always liked this combo (going back 15 years), and still like it now. Have compared it to many other AQ models - symmetric double bi-wire, internal biwire, single wire. There’s 2 cable configurations I’ve liked better (both much more expensive), but I like this combo better than all the rest. The AQ hybrids - with copper & silver in one cable - are quite good, but no more effective that this mixed biwire, IMO.

The knock against this approach would be a sacrifice of "coherence" from the asymmetric biwire - but I don’t hear ANY issues with coherence here. Silver helps bring out detail and sparkle. Copper keeps a nice overall warmth. And it all blends nicely. Speaking of coherence worries, my Tannoys pair a metal dome with a large paper cone - and they’re still incredibly coherent, to my ears!

My experience is it depends. 
 

I have listened to different cables and ultimately chose Kimber Kable bifocals XL. I am positive with enough time I could have found another excellent solution. 
 

Enjoy your journey!

PS Audio includes good jumpers, not the typical cheap metal plate...certainly worth trying jumpers the same cable as main cables,  and also separate double run, then decide if it's worth it...buy with return privileges and noting to lose...I use double run on FR20's...

@howardlee , it almost doesn’t matter what the subject is, the answers will range from "snake oil--it doesn’t have any effect on sonic performance" to "I hear a difference." Personally, I think it probably depends upon the speakers. If KEF or PSAudio provides any kind of tech support at all, it might be worth contacting them to find out what they think about b-wiring their speakers.

At the time I bi-wired I was running a pair of B&W 805s (the Matrix series) and I think B&W was saying that those speakers would benefit from bi-wiring. I felt that I heard an incremental improvement. At the time (going on 30 years ago) I was continuously trying to make upgrades and subtle improvements as I was into "the sum of all parts" theory, and I looked at bi-wiring as just another one of the parts.

I've already got matching cables to do it so I might as well.  Don't see how it would degrade anything and going to more expensive cabling at this point would likely be unnecessary exploration. 30 years ago I'd have been into comparing things (and did, a lot) but you are correct.