Fairly recently bought a bi-wire 4’ pair Analysis Plus Big Silver Oval 9 to run to my Usher Mini Diamond 2s from a pair of Merrill Audio Veritas monos. It was a significant difference in drive, control and headroom.
A Grover Huffman PC I put on my then EAR 834P was a big step up in dimensionality.
Going bi-wire on 3 different models of Usher speakers throughout the years, made a significant difference. The music just bloomed.