Loudspeaker Cable - Naim Nac A5 vs Kimber 4TC (single vs biwire)


Hi All cable fans, i have a nice Primare Amp and nice Elac 507 Speaker. I just used my old Nac A5 cable as I had this at home. Sound is great. Anyhow I was reading that this cable might have slightly disadvantages on the heights. 
So I attached a new Kimber 4TC as biwire cable just for the mid/hi-pass. The Nac A5 is now directly connected to the low pass. I clearly took out the interconnector between the hi/mid & low-pass. 
I was expecting any improvement of the mid/hi‘s,
but the result is absolutely nothing 🤦‍♂️. No change of the sound, no improvements :(. Thats a pitty and wast of money. Did I learn that biwire is wast?!?!

ps: I hope the cable will open over time if this magic exist..
peterzuerich
The music does not need to be loud, the important thing is a signal running through the cables. 
I tried once the 8TC for the bass, and i have the same result with this 4TC AC = bass is not good! The bass become less precise, less punchy and more booming. Same effect like with a too small amp. 
Okay then I will put only the 4TC on the speaker on Friday, where I go 1 week ago. I will let the musik run 1 Week :-). I hope its not important to make it very loud as i have neighbors. 
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Out of curiosity did you try switching the two cables, Nac A5 to mids and highs and Kimber 4TC to bass? Did you hear a difference or did they sound the same?